Neurological
  COMMON LAB TESTS FOR NEUROLOGICAL DISORDERS: CEREBROSPINAL
                            FLUID

   1. Appeara...
Cerebrospinal Fluid (CSF)

Definition: A watery cushion that protects the brain and spinal cord from physical impact and b...
Tomography and resonance imaging

Computerized tomography (CT) scans

   a. use a roentgen ray and a computer to provide a...
5. Nursing interventions
         a. explain procedure to client
         b. administer sedative if ordered
         c. as...
I.   Neurological Anatomy and Physiology




      A.   Central nervous system (CNS) - coordinates and controls body funct...
v.    occipital lobe - vision
      b.    cerebellum - provide equilibrium and muscle coordination
      c.    brain stem ...
B.   Peripheral nervous system - carries information to and from the CNS
      1.    Motor nerves
      2.    Sensory nerv...
C.   Autonomic nervous system - regulates body's internal environment
      1.   Sympathetic - prepares body for fight or ...
D. Cranial nerves

   These nerves are the vital bridges between the brain and the rest of the
   body.




E. Physiology ...
d. vital signs - increased systolic pressure to result in a
                          widened pulse pressure, decreased re...
II.   pallidotomy - pinpoint the areas to be treated
                           surgically
                     III.  deep...
e.   etiology unknown
      2.    Findings
              a.   usually beginning in the upper body - the head and arms,
   ...
3.   Management - expected outcome: maintenance of functional
     capacity
4.   Nursing interventions
       a.   meet cl...
E. Organic brain syndrome
                   1. Definition - a general term used to categorize physical conditions
       ...
d.    increased blood cholesterol and triglycerides
          e.    chronic atrial fibrillation
2.      Five classes of st...
B. Findings (depends on the location of the lesion)

    Types of CVA




C. Diagnostics
      1. History and physical exa...
a. prevent or minimize the damaging effects of stoke
                             b. depends on the type of CVA
          ...
2. Long-term care of client with stroke
                        a. monitor to facilitate normal elimination patterns
     ...
•   children under the age of 2 years-old
                                                  •   adults with weakened or su...
B. Parameningeal infections
      1. Definition
            a. localized collection of exudate in the brain or in the spin...
a. expected outcomes: to cure infection and prevent
                         infections
                      b. uncomplic...
e.   evoked potentials or response - the EEG record of
                   electrical activity at one of several levels in ...
CARE OF THE CLIENT ON VENTILATOR

Nutrition

   1. Administer as ordered
         a. IV fluids, meds
         b. Enteral f...
C. Myasthenia gravis (MG)
     1. Definition
            a. antibodies destroy acetylcholine receptors where nerves
      ...
c. thymectomy




      d. plasma exchange
      e. myasthenic crisis management
              i. crisis usually follows s...
f.   teach client
                                i. energy conservation techniques
                               ii. exp...
i.    characterized by violent bilateral muscle
                    movements
             ii.    hyperventilation
       ...
6. Management
                         a. expected outcomes: to control or minimize the seizure
                          ...
iii.  cluster headache
                      iv.   hemiplegic headache
                       v.   ophthalmoplegic headach...
VIII.   Head Trauma




        A.   Classifications
              1.     Closed versus open injury
                      ...
c.   severe: decreased LOC with serious neurological
                  impairment and sequelae




B. Types of skull fract...
c. subacute: findings surface 72 hours to 2 weeks after injury
                    with a slower progression of deteriorat...
b. physical
                            c. speech
                            d. behavioral
                            e....
2.    Facilitate emotional support with referrals to support groups for the
                  client and family




X.   P...
c.   flat nasolabial fold
                                d.    impaired taste
                                e.    lower...
XI.   Senses: Eye and Ear
       I.   Eye structures
             A.    Three layers of the eye: sclera, choroid, and reti...
a.    consists of four layers
                                   i. pigmented epithelial cell
                            ...
2. Lacrimal duct: secretes and drains fluid that moistens and
                  lubricates the front surface of the eye; w...
III.   Disorders of the Eye

       Overview and content: eye disorders from the front to the back of the eye




Eye diso...
2. Corneal abrasion
               1. disruption of the cells and loss of superficial epithelium
               2. caused ...
1. Most common type: chronic open-angle glaucoma (simple, adult
                            primary, primary open-angle)
 ...
d. management
            i. expected outcomes - reduction of IOP and
               prevention of visual field defects
  ...
i.    a medical and nursing emergency
                     ii.    iris lies near drainage channel (canal of Schlemm)
     ...
8C Neurological Final.doc.doc
8C Neurological Final.doc.doc
8C Neurological Final.doc.doc
8C Neurological Final.doc.doc
8C Neurological Final.doc.doc
8C Neurological Final.doc.doc
8C Neurological Final.doc.doc
8C Neurological Final.doc.doc
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8C Neurological Final.doc.doc

  1. 1. Neurological COMMON LAB TESTS FOR NEUROLOGICAL DISORDERS: CEREBROSPINAL FLUID 1. Appearance colorless, clear 2. Pressure 50-180 mm H2O 3. Protein a. Lumbar 15-50 mg/dl b. Cisternal 15-25 mg/dl c. Ventricular 6-15 mg/dl 4. Cell Count a. RBCs negative b. WBCs 0-5 5. Glucose 50-80 mg/dl 6. Gram stain negative for organisms 7. Culture and sensitivity: no growth Cerebrospinal fluid analysis a. obtained via lumbar, cisternal or ventricular puncture b. indications: inflammation, infection c. standard precautions are required d. maintain strict asepsis
  2. 2. Cerebrospinal Fluid (CSF) Definition: A watery cushion that protects the brain and spinal cord from physical impact and bathes the brain in electrolytes and proteins. Formation: The fluid is formed by the choroid plexuses of the lateral and third ventricles. That of the lateral ventricles passes through the foramen of Monro to the third ventricle, and through the aqueduct of Sylvius to the fourth ventricle. There it may escape through the central foramen of Magendie or the lateral foramina of Luschke into the cisterna magna and to the cranial and spinal subarachnoid spaces. It is reabsorbed through the arachnoid villi into the blood in the cranial venous sinuses, and through the perineural lymph spaces of both the brain and the cord. Characteristics: The fluid is normally watery, clear, colorless, and almost entirely free of cells. The initial pressure of spinal fluid in a side-lying adult is about 100 to 180 mm of water. On average, the total protein is about 15 to 50 mg/dl, and the concentration of glucose is about two-thirds the concentration of glucose in the patient's serum. Its pH, which is rarely measured clinically, is slightly more acidic than the pH of blood. Its concentration and alkaline reserve are similar to those of blood. It does not clot on standing. Turbidity suggests an excessively high number of cells in the fluid, typically white blood cells in infection or red blood cells in hemorrhage. CSF may appear red following a recent subarachnoid hemorrhage or when the lumbar puncture that obtained the CSF caused traumatic injury to the dura that surround the fluid. Centrifugation of the fluid can distinguish between these two sources of blood in the spinal fluid: the supernatant is usually stained yellow (xanthochromic) only when there has been a recent subarachnoid hemorrhage. Many conditions may cause increases in total protein: infections, such as acute or chronic meningitis; multiple sclerosis (when oligoclonal protein bands are present); Guillain-Barré syndrome; and chronic medical conditions like cirrhosis and hypothyroidism (when diffuse hypergammaglobulinemia is present). The concentration of glucose in the CSF rises in uncontrolled diabetes mellitus and drops precipitously in meningitis, sarcoidosis, and some other illnesses. Malignant cells in the CSF, demonstrated after centrifugation or filtering, are hallmarks of carcinomatous meningitis. Microorganism: The CSF is normally sterile. Meningococci, streptococci, Haemophilus influenzae, Listeria monocytogenes , and gram-negative bacilli are recovered from the CSF only in cases of meningitis. Syphilitic meningitis is usually diagnosed with serological tests for the disease, such as the venereal disease research laboratory (VDRL) test, the rapid plasma reagin (RPR) test, or the fluorescent treponemal antibody test. Cryptococcal infection of the CSF may be demonstrated by India ink preparations, or by latex agglutination tests. Tuberculous meningitis may sometimes be diagnosed with Ziehl-Neelsen stains, but more often this is done with cultures. These last three infections (syphilis, cryptococcosis, and tuberculosis) are much more common in patients who have acquired immunodeficiency syndrome (AIDS) than in the general population. Electroencephalogram (EEG) a. records electrical activity at various brain sites b. specific nursing interventions i. do not stop anticonvulsant medications ii. the night before test, adult clients should have minimal sleep iii. hair should be washed prior to test iv. after test, help client remove paste
  3. 3. Tomography and resonance imaging Computerized tomography (CT) scans a. use a roentgen ray and a computer to provide accurate images of cross sections of the body b. a non-invasive procedure using very little radiation that visualizes slices of tissues c. usually takes less than one hour d. sharper images than conventional x-rays e. contraindicated in pregnancy f. nursing interventions i. explain test to client ii. some clients may require mild sedation iii. client must lie very still iv. client receives radiopaque solution to visualize blood vessels v. client is NPO past midnight when contrast is used vi. if barium studies were done, wait at least four days for CT scan, or barium will obscure film Positive emission tomography (PET) a. uses an intravenous injection of radioactive substance followed by a head scan b. various shades of color indicate levels of glucose metabolism in the brain c. nursing interventions: same as CT scan Magnetic resonance imaging (MRI) a. tomography based on the magnetic behavior of protons in the body tissues b. used to detect neurologic and musculoskeletal disorders c. contraindicated in clients with metal implants such as pacemakers, aneurysm clips, medication patches that are foil backed, metallic orthopedic devices, can be uncomfortable with multiple tattoos d. nursing interventions i. explain test to client ii. client must lie very still iii. client may become claustrophobic in chamber iv. soft humming sound may annoy some clients v. client must remove all metal jewelry and watches Lumbar puncture (LP) (Spinal Tap) a. needle inserted into the subarachnoid space between L3 and S1 b. uses i. measure cerebrospinal fluid (CSF) pressure ii. obtain CSF for visual and laboratory examination iii. to inject medications, anesthetic agents, diagnostic agents. 1. Contraindicated if client has increased intracranial pressure (ICP) 2. Place client in lateral decubitus position (knee-chest) 3. Complications include post-puncture headache 4. CSF findings
  4. 4. 5. Nursing interventions a. explain procedure to client b. administer sedative if ordered c. assist client to maintain proper position and stillness during procedure d. strict asepsis e. maintain standard precautions f. label specimens sequentially g. provide emotional support as procedure can be painful h. post-procedure i. keep client flat on back from four to 12 hours ii. give analgesics & ice pack as ordered iii. perform neuro checks and vital signs prequently to assure stability iv. encourage fluids unless contraindicated v. observe for post-puncture headache, leakage of CSF, tingling sensation, numbness or pain in lower extremities Intracranial pressure (ICP) monitoring a. invasive: measuring device is placed i. in a ventricle ii. in a subarachnoid space iii. outside dura mater iv. within parenchyma b. types of devices include aventricular catheter; a subarachnoid bolt; an epidural sensor c. changes in intracranial pressure are converted to an electrical impulse by a transducer and displayed on a screen or on graph paper d. measurements include volume-pressure relationships, pressure waves and cerebral perfusion pressures e. normal ICP: 10-15 mm Hg f. nursing interventions i. maintain strict sterile technique ii. maintain patency of device iii. observe for CSF leaks or bleeding, signs of infection iv. monitor pressure and report deviations
  5. 5. I. Neurological Anatomy and Physiology A. Central nervous system (CNS) - coordinates and controls body functions 1. Brain a. cerebrum i. hemispheres right and left ii. frontal lobe - higher intellectual functions, social behavior, personality iii. parietal lobe - perceives and interprets sensory input iv. temporal lobe - emotional response, memory, language, organization of sensory input (hearing, taste and smell)
  6. 6. v. occipital lobe - vision b. cerebellum - provide equilibrium and muscle coordination c. brain stem - midbrain, pons and medulla oblongata; controls basic body functions and relays impulses to and from spinal cord; the connection between the brain and spinal cord 2. Spinal cord a. descending tract - anterior portion of cord carrying motor information; associate "d"escending to "d"own impulses are carried to peripheral nerves b. ascending tract i. the posterior portion of cord that carries sensory information up to the brain ii. 31 segments • eight cervical: neck and upper extremities • 12 thoracic: thoracic and abdomen • five lumbar: lower extremities • five sacral: lower extremities, urine and bowel control • one coccygeal
  7. 7. B. Peripheral nervous system - carries information to and from the CNS 1. Motor nerves 2. Sensory nerves
  8. 8. C. Autonomic nervous system - regulates body's internal environment 1. Sympathetic - prepares body for fight or flight; used only as needed when scared or excessively happy 2. Parasympathetic - controls normal body functioning for day to day activities, e.g., increases muscle tone, maintains secretions with moist mucous membranes; maintains heart rate within normal limits; maintains GI and GU peristalsis
  9. 9. D. Cranial nerves These nerves are the vital bridges between the brain and the rest of the body. E. Physiology - nervous system coordinates and controls all activities of the body 1. Receives internal and external stimuli 2. Processes information to determine appropriate response 3. Transmits information over varied motor pathways to effector organs F. Findings for increased intracranial pressure (ICP) 1. Early a. change in level of consicousness (LOC): restlessness, agitation, irritability, disorientation, confusion, lethargy, stupor b. pupils: dilated ipsilaterally, react slowly to light c. abnormal motor activity: contralateral hemiparesis d. abnormal reflexes - hyper or hypo reflexia e. vital signs within normal parameters 2. Late a. LOC: semicomatose, coma b. pupils: dilated bilaterally and fixed; no reaction to light c. motor function: decorticate posture then decerebrate posture; flaccid muscles at end stage
  10. 10. d. vital signs - increased systolic pressure to result in a widened pulse pressure, decreased respirations with bradycardia (Tip: heart and lungs go in similar directions - both increase or decrease), temperature initially may rise then fall below normal parameters II. Degenerative Disorders A. Parkinson's disease 1. Definition: degenerative disorder of the dopamine hydrochloride - producing neurons a. result: dopamine hydrochloride depletion b. usually occurs in older adults and males more than females c. etiology unknown 2. Findings: first unilateral, then bilateral movements a. resting tremors of the lips, jaw, tongue, and limbs, especially a resting pill-rolling tremor of one hand that is absent during sleep. This tremor is often labeled - "non intention" tremor. This is different from an essential or intention tremor in which the tremor is action related and labeled "intention" tremor. b. bradykinesia c. fatigue d. stiffness and rigidity with movement e. mask-like facial expression often accompanied with drooling f. slow, shuffling walk in a stooped-over posture; gradually more difficulty with walking g. difficulty rising from sitting position h. ultimately confined to a wheelchair i. mind stays intact unless other aggravating conditions j. echolalia in most cases 3. Diagnostics a. based on findings with history b. EEG c. MRI d. computerized tomogram (CT scan) 4. Management a. expected outcomes: palliative and to postpone dependence b. pharmacologic I. anticholinergics - minimize extrapyramidal effects I. benzotropine mesylate (Cogentin) II. procyclidine (Kemadrin) II. dopamine hydrochloridergics: Levodopa (L-Dopa) III. antiparkinsonian agent: amantadine HCl (Symmetrel) reduces rigidity and tremor IV. MAO inhibitors: selegiline (Eldepryl) V. coenzyme Q-10 VI. others I. selegiline (Carbex) II. COMT inhibitors III. tolcapone (Tasmar) IV. entacapone (if combined with carbidopa and levodopa the medication is Stalevo) c. therapies I. physical II. occupational III. speech d. surgery: to decrease tremor I. stereotaxic thalamotomy
  11. 11. II. pallidotomy - pinpoint the areas to be treated surgically III. deep brain stimulation 5. Nursing interventions a. maintain safety of client b. prevent effects of immobility c. foster independence in activities of daily living (ADL) d. reinforce the use of assistive devices for ambulation as indicated e. promote good nutrition I. small, frequent meals II. soft foods III. roughage with sufficient fluids to decrease constipation f. monitor effectiveness or ineffectiveness of administered medications g. provide emotional support to client and family members h. teach client I. when and what side effects of the drugs to report II. the benefits of daily exercise III. the benefits of "drug holidays" B. Huntington's disease 1. Definition a. progressive atrophy of basal ganglia and some parts of cerebral cortex b. etiology - genetic disorder, autosomal dominant 2. Findings: usually occurs in middle age, increased involuntary movements, progressive decline in cognitive function a. motor function I. impaired chewing and swallowing II. chorea III. dystonic posture IV. gradually becomes bedridden b. cognitive function: less able to organize, plan and sequence behavior c. mental function: personality changes, depression, even psychosis 3. Diagnostics: history and physical exam 4. Management a. expected outcome: postpone dependence b. supportive care for findings c. therapies: speech, physical d. genetic counseling 5. Nursing interventions a. foster independence in ADL b. reinforce the use of assistive devices for ambulation as needed c. teach client to I. maintain good nutrition II. get emotional support from support groups, friends III. seek genetic counseling C. Amyotrophic lateral sclerosis (ALS, Lou Gehrig's disease) 1. Definition a. progressive atrophy of spinal muscle; bulbar palsy b. progressive degeneration of the motor neurons of the anterior horn cells of the spinal cord, brainstem, and motor cortex c. onset in later middle age; more in men than in women d. clients with ALS usually die within two to six years
  12. 12. e. etiology unknown 2. Findings a. usually beginning in the upper body - the head and arms, the distal portion first b. mild clumsiness progressing to total incapacity c. muscle wasting, atrophy, spasticity d. speech disorders e. no change in sensation or autonomic system f. death most often from complications: respiratory failure, urinary or pulmonary infections for stasis g. mind usually intact while client has loss of voluntary and eventually involuntary muscle functions 3. Diagnostics: history and physical exam 4. Management a. expected outcome: keep functional independence as much as possible b. no cure c. management of findings I. muscle relaxants for spasticity II. therapies: I. speech II. physical III. respiratory support IV. nutritional support 5. Nursing interventions a. provide for respiratory care and referrals b. maintain a safe environment focused toward infection prevention c. prevent complications of immobility especially pulmonary and urinary stasis d. postpone dependence e. promote balanced nutrition f. provide emotional support and referrals to support groups D. Dementia 1. Etiology a. characterized by irreversible, progressive cerebral dysfunction b. Alzheimer's disease - most common cause of dementia I. characterized by brain atrophy II. development of senile plaques and neurofibrillary tangles in the cerebral hemispheres III. etiology unknown 2. Findings a. initially characterized by decreased intellectual functioning b. Alzheimer's disease has three stages I. early stage I. memory loss II. subtle personality changes III. difficulty with abstract thinking II. middle stage I. impaired judgment II. impaired language III. difficulty with motor activity and object recognition IV. wandering V. inability to carry out ADL III. final stage I. complete loss of language function II. loss of bowel and bladder control c. prognosis - poor, incurable
  13. 13. 3. Management - expected outcome: maintenance of functional capacity 4. Nursing interventions a. meet client's physical needs b. promote client's independence c. promote contact with reality d. assist client/family to establish a routine e. provide emotional support or caregiver support with appropriate referrals
  14. 14. E. Organic brain syndrome 1. Definition - a general term used to categorize physical conditions that can cause decreased mental function 2. Etiology a. degenerative disorders b. drug and alcohol related conditions c. infections d. repiratory conditions e. trauma-induced brain injury f. cardiovascular disorders g. dementia from metabolic disorders 3. Findings a. findings vary with the specific disease b. in general, organic brain syndromes cause varying degrees of confusion c. delirium - severe often sudden short term loss of brain function as with high temperatures, drug withdrawal d. agitation e. dementia - long term loss of brain function f. aggression - typical of some of the conditions contributing to this diagnosis 4. Management a. therapy varies with the specific disorder b. many of the disorders have nonspecific treatments c. the priority in many instances is supportive care to assist the person in areas where brain function is lost d. medications may be needed to reduce aggressive behaviors typical of some of the conditions in this category 5. Nursing interventions a. assist to meet the client's physical needs b. refer family to support systems c. monitor the effectiveness of medication therapy d. evaluate changes to where the client is unable to maintain independence with ADL III. Cerebrovascular Accident (CVA, Stroke, Cerebral Infarction) A. Definition: decreased blood supply to the brain 1. Risk factors a. hypertension, uncontrolled b. smoking c. obesity
  15. 15. d. increased blood cholesterol and triglycerides e. chronic atrial fibrillation 2. Five classes of stroke: by "severity" - least to most severe a. transient ischemic attack (TIA), "angina" of the brain i. TIA is warning sign of stroke ii. localized ischemic event iii. produces neurological deficits lasting only minutes or hours iv. full functional recovery within 24 to 48 hours b. reversible ischemic neurological deficit (RIND) i. similar to TIA ii. findings last between 24 hours and three weeks iii. usual full functional recovery within three to four weeks c. partial, nonprogressing stroke: some neurological deficit, but stabilized d. progressing stroke (stroke in evolution) i. deterioration of neurological status often with grand mal seizure activity ii. has residual neurological deficits that last indefinitely e. completed stroke - results from a stroke in evolution 3. Two types of stroke by "cause" a. ischemic (also known as occlusive) stroke (clot) - slower onset i. results from inadequate blood flow leading to a cerebral infarction ii. caused by cerebral thrombosis or embolism within the cerebral blood vessels iii. most common cause: atherosclerosis b. hemorrhagic stroke (bleeding) - abrupt onset i. intracerebral hemorrhagic stroke • blood vessels rupture with a bleed into the brain • occurs most often in hypertensive older adults • may also result during anticoagulant or thrombolytic therapy ii. subarachnoid hemorrhage (SAH) • most often caused by rupture of saccular intracranial aneurysms • more than 90% are congenital aneurysms iii. epidural bleeds • cerebral arterial vessels are involved • often a loss of consciousness for a short period of time called transient unconsciousness • recall clue: associate that "e" in epidural and "a" in artery are together at the top of the alphabet iv. subdural bleeds • veins are involved • may not be evident until months after an initial trauma • recall clue: associate that "s" in subdural and "v" in vein are together at the bottom of the alphabet
  16. 16. B. Findings (depends on the location of the lesion) Types of CVA C. Diagnostics 1. History and physical exam 2. Computerized tomogram (CT) scan 3. Magnetic resenance imaging (MRI) 4. Doppler echocardiography flow analysis 5. Carotid artery duplex doppler ultrasonography 6. EEG - shows abnormal electrical activity 7. Lumbar puncture - shows if blood is found in the cerebral spinal fluid as a result of a cerebral bleed 8. Cerebral angiography - shows blood flow in cerebral arteries a. may be done with or without contrast D. Management - to prevent or minimize the damaging effects of stroke; dependent on the type of CVA 1. Expected outcomes
  17. 17. a. prevent or minimize the damaging effects of stoke b. depends on the type of CVA 2. Occlusive stroke a. pharmacologic 1. thrombolytics 2. anticoagulant therapy: heparin, coumadin 3. antiplatelet therapy: aspirin, dipyridamole (Persantine) 1. platelet aggregation inhibitor: clopidogrel (Plavix), ticlopidine HCL (Ticlid) 4. steroids: dexamethasone (Decadron) b. surgery - bypass - carotid endarterectomy 3. Hemorrhagic stroke a. pharmacologic 1. antihypertensive agents 2. systemic steroids: dexamethasone (Decadron) 3. osmotic diuretics: mannitol 4. antifibrinolytic agents: aminocaproic acid (Amicar) 5. vasodilators 6. alpha-blockers and beta-blockers 7. anticonvulsants b. surgical excision of aneurysm 4. Common to both types of stroke a. care based on findings b. therapies 1. nutritional support 2. physical 3. speech 4. behavioral 5. occupational E. Nursing interventions 1. In acute stage of stroke a. maintain airway patency; if grand mal seizure activity note time, length, behaviors b. monitor neuro status and vital signs c. maintain adequate fluids d. position with head of bed elevated 15 to 30 degrees with client turned or tilted to unaffected side e. provide activity as ordered f. perform passive and/or active range of motion exercises g. maintain client's proper body alignment h. administer medications as ordered i. care for post op client as indicated j. provide care for client with increased intracranial pressure CARE OF CLIENT WITH INCREASED INTRACRANIAL PRESSURE 1. Institute seizure precautions 2. Administer oxygen as ordered 3. Monitor for changes in intracranial pressure 4. Monitor neuro vital signs as ordered 5. Maintain fluid restriction as ordered 6. Observe for herniation syndrome 7. Raise head of bed at 30-45 degrees; avoid 90 degrees since pressure in hip area increases ICP 8. Prevent any activities that increase ICP such as: laughing, straining at stool, coughing, vomiting, any restrictive clothing around neck, anxiety, pushing up in bed with heels, pulling on rails when turning, neck rotation, flexion or extension 9. Provide for the care of the unconscious clients if decreased LOC
  18. 18. 2. Long-term care of client with stroke a. monitor to facilitate normal elimination patterns b. teach/evaluate the use of supportive devices c. maintain client in a safe environment d. prevent the effects of immobility e. support the maintenance of adequate nutrition in light of feeding and swallowing problems f. assist with eating and ADL as indicated g. provide emotional support h. provide methods of communication for client with aphasia IV. Infectious Inflammatory Disorders A. Meningitis 1. Definition/course a. acute or chronic inflammation of the meninges b. average length of illness is four months 2. Types a. bacterial: mostly contagious; requires isolation i. mostly common meningococcal • the covering of the brain and spinal cord are involved • in children 2 to 18 years-old • in high risk groups o infants o adults with weakened or suppressed immune systems o college students – freshman in particular who reside in dormitories o travelers to foreign countries where disease is endemic o 10 – 15% of cases are fatal o 10 – 15 % of cases result in brain damage or other serious side effects ii. Haemophilus influenzae; those at risk are • children in child care settings • children with no access to vaccine iii. pneumococcal; those at risk are
  19. 19. • children under the age of 2 years-old • adults with weakened or suppressed immune systems b. viral i.isolation is not required ii.aseptic meningitis is the most common form in the USA c. cryptococcal fungal i. often from bird droppings ii. organism is found in dirt iii. common in clients with AIDS 3. Findings a. severe headache b. sudden fever c. altered LOC – decreased d. photophobia e. nuchal rigidity – severe pain in the back of neck when the chin is moved toward the chest with the client resisting movement 4. Diagnostics a. history and physical exam b. positive Kernig's sign: 90-degree flexion of hip and knee with extension of knee causes pain c. positive Brudzinski's sign: flexion of neck causes flexion of hip and knee d. lumbar puncture for characteristics of cerebral spinal fluid - decreased glucose in bacterial or fungal infections e. CT or MRI with and without contrast f. EEG 5. Management a. expected outcomes: to cure the infection and prevent complications b. pharmacologic i. antibiotic therapy depends on the type of pathogen ii. preventive therapy for people exposed to those with meningococcal or haemophilus influenzae (H flu) meningitis: rifampin (rifadin) iii. H flu vaccine iv. antifungals if fungus v. anticonvulsants to prevent seizures c. actions to minimize fever d. prevention of increased intracranial pressure or seizures 6. Nursing interventions a. care of client with increased ICP b. seizure precautions c. administer drugs as ordered d. provide comfort measures for pain SEIZURE PRECAUTIONS e. reduce external stimuli and lighting if photophobia Before seizure 1. Bed rest with padded side rails 2. Suction available at the bedside 3. Oxygen available at bedside During seizures 1. Loosen any tight or restrictive clothing. 2. If clients are falling, gently help them to the ground and position clients on their side. 3. Do not place anything in the mouth. 4. Observe the seizure as it runs its course. 5. If it lasts longer than 5 minutes, notify health care provider immediately. 6. Note the activity and the time it begun and ended. Daily life precautions 1. For children discourage climbing over 10 feet high. 2. Recommend for clients not to lock bathroom or shower doors. 3. If swimming, clients are to have someone with them who can rescue. 4. If old enough to drive, clients should be seizure free for six months. The time may vary in some states.
  20. 20. B. Parameningeal infections 1. Definition a. localized collection of exudate in the brain or in the spinal cord b. a recurrent aseptic meningitis c. considered noninfectious 2. Findings a. similar to meningitis b. headache, fever, stiff neck, altered consciousness - decreased 3. Diagnostics a. NO lumbar puncture; may cause herniation b. computerized tomogram (CT) scan 4. Management a. expected outcomes: to cure infection and prevent complications b. surgical decompression of abscess c. symptomatic and preventive treatment as with meningitis d. drugs: antibiotics 5. Nursing interventions: same as meningitis except that infectious precautions are not required C. Encephalitis 1. Definition a. acute viral or less commonly bacterial inflammation, irritation and swelling on the brain tissue b. can occur as epidemics or sporadically c. death rate ranges up to 70% d. most cases in the USA associated with sporadic encephalitis is herpes simplex virus types 1 and 2, rabies virus, or arboviruses from the bite of infected ticks, mosquito or other blood sucking insects, i.e., Equine, La Crosse, St. Louis, West Nile e. may follow a systemic viral illness such as chicken pox 2. Findings a. adult 1. sudden fever 2. severe headache 3. altered LOC – decreased progressing to stupor then coma with seizure activity 4. nuchal rigidity 5. speech or hearing de 6. change in personality 7. mild flu-like complaints b. infant 1. vomiting 2. body stiffness 3. constant crying that worsens when child picked up 4. constant full or bulging anterior fontanel 3. Diagnostics a. history and physical exam b. CT scan, MRI, EEG c. brain biopsy d. cerebral spinal fluid – decreased glucose suggests bacterial or fungal infection 4. Management
  21. 21. a. expected outcomes: to cure infection and prevent infections b. uncomplicated cases require supportive and preventive care c. bed or chair rest d. support nutritional needs e. monitor for fluid balance maintenance f. herpes simplex calls for antivirals: vidarabine (viraA), acyclovir (Zovirax) g. prevention of increased ICP h. antivirals such as acyclovir or ganciclovir i. anticonvulsants - prevent seizures 5. Nursing interventions a. comfort measures for fever b. administer drugs as ordered c. seizure precautions d. care of the client with increased ICP e. when needed, ensure isolation and airborne-droplet precautions V. Various Disorders of the Neurologic System A. Multiple sclerosis 1. Definition a. demyelination of white matter throughout brain and spinal cord b. third most common cause of disability in clients aged 15 to 60 c. specific cause unknown d. increased incidence in temperate to cool climates e. illness improves and worsens unpredictably 2. Findings depend on the location of the demyelination a. cranial nerve: blurred vision, dysphagia, diplopia, facial weakness and/or numbness b. motor: weakness, paralysis, spasticity, gait disturbances c. sensory: paresthesias, decreased proprioception d. cerebellar: dysarthria, tremor, incoordination, ataxia, vertigo e. cognitive: decreased short-term memory, difficulty with new information, word-finding difficulty, short attention span f. urinary retention or incontinence g. loss of bowel control h. sexual dysfunction i. fatigue 3. Diagnostics a. history and physical exam b. lumbar puncture c. magnetic resonance imagery (MRI) d. computerized tomogram (CT) scan
  22. 22. e. evoked potentials or response - the EEG record of electrical activity at one of several levels in the CNS by stimulation of an area of the sensory nerve system 4. Management a. expected outcomes: to alleviate findings and prevent complications b. pharmacologic: adrenocorticotropic hormone (ACTH) c. therapies based on findings I. physical II. occupational III. pharmacologic 5. Nursing interventions a. maintain client's functional independence in ADL b. determine effectiveness of administed medications c. prevent complications of immobility d. prevent injury from difficulties walking e. provide emotional support to client and family f. provide counseling for sexual dysfunction g. teach client to: I. avoid fatigue and stress II. conserve energy III. exercise regularly IV. know drugs and side effects V. use self-help devices VI. maintain a diet that supports nutrition and energy needs B. Guillain-Barre syndrome 1. Definition a. acquired inflammatory disease b. process: demyelinization of peripheral nerves c. precipitating factors include prior bacterial or viral infection within one to two weeks 2. Findings a. muscle weakness: progressive, ascending, bilateral b. leads to paralysis of voluntary muscles c. loss of superficial and deep tendon reflexes d. bulbar weakness e. dysphagia f. dysarthria g. respiratory failure h. sensory findings: paresthesias, burning pain i. paralysis may vary from being total to partial of only one- half way up the body 3. Diagnostics a. history and physical exam b. lumbar puncture will show increased protein in CSF c. electromyography (EMG) 4. Management a. expected outcomes: to prevent complications and maintain body functions until any reversal b. steroids in acute phase c. care as dictated by areas involved 5. Nursing interventions a. maintain the care of client on ventilatory support b. provide for care of the immobilized client c. have a safe environment to minimize infection d. maintain nutrition and fluid balance e. refer families or client to support groups f. supply referrals to therapies such as speech, physical, occupational and counseling
  23. 23. CARE OF THE CLIENT ON VENTILATOR Nutrition 1. Administer as ordered a. IV fluids, meds b. Enteral feedings 2. Evaluate for a. balanced fluid intake and output b. adequate and balanced nutrition Hygiene 1. Provide a. a rigorous, scheduled mouth care – prevents ventilator acquired pneumonia bed baths and skin care as necessary b. eye care if client has decreased LOC c. meticulous perineal care to prevent yeast infections d. for the initiation of a bowel regimen with stool softeners with expected bowel movements at least every three days Skin and Muscle Integrity 1. Prevent the effects of immobility by routine passive or active range of motion exercises or get client OOB as tolerated 2. Minimize decubitus ulcers by avoidance of rubbing or massaging reddened areas 3. Reposition client every hour if bed ridden Safety 1. Apply bilateral splints as ordered to prevent footdrop and wristdrop 2. Provide a safe environment - bed in low position, side rails up, call light within reach 3. Initiate seizure precautions if indicated Sensory Stimulation 1. Provide appropriate stimulation which means to schedule groups of tasks to prevent overstimulation 2. Talk to clients before and during procedures or when any direct care or when in the room for other reasons 3. Explain procedures before beginning them 4. Encourage family members to talk with clients about usual family activities 5. Enhance stimulation by a. insertion of hearing aids b. a check of glasses for cloudy smeared lens then clean and put them nearby or on client c. a change of lighting in the room to mimic natural light changes d. promotion of the use of electronic battery devices such as CD – DVD – MP3 players, radio, television. Have maintenance check for leakage of currents before use.
  24. 24. C. Myasthenia gravis (MG) 1. Definition a. antibodies destroy acetylcholine receptors where nerves join muscles - myoneural junction b. two age clusters: women in early adulthood and men in late adulthood c. progressive with occurances of crises 2. Findings a. progressive fatigue or weakness of voluntary muscles, but no muscular atrophy b. sensation remains intact c. facial i. ptosis (drooping eyelid) and reduced eye closure ii. weak smile iii. diplopia, blurred vision iv. speech and swallowing disorders v. weakness of facial muscles - difficulty to raise eyebrows, make different faces d. signs of restrictive lung disease 3. Diagnostics a. history and physical exam b. edrophonium (tensilon) test: improved muscle strength after tensilon injection indicates a positive test for MG 4. Management a. expected outcomes: to improve strength and endurance b. pharmacologic i. anticholinesterase agents: pyridostigmine (mestinon), neostigmine (prostigmin) ii. corticosteroid therapy iii. immunosuppressants: azathioprine (imuran)
  25. 25. c. thymectomy d. plasma exchange e. myasthenic crisis management i. crisis usually follows stressor or during dosage changes usually when being increased ii. signs: sudden inability to swallow, speak, or maintain patent airway iii. cholinergic crisis may follow over dosage of medication iv. positive edrophonium (tensilon) test signals myasthenia v. if negative endophronium test, client has not myasthenic but cholinergic crisis, so treat with atropine vi. ventilatory support as indicated 5. Nursing interventions a. identify aggravating factors, such as: i. infection ii. stress iii. changes in medication regime - especially when increasing dose b. if client is in crisis: provide care of the client on ventilatory support c. give medications as ordered and on time d. help with ADL and feeding as indicated e. provide i. emotional support ii. adequate rest periods iii. care of the post-surgical client
  26. 26. f. teach client i. energy conservation techniques ii. expectations, side effects and medications iii. signs of impending crisis, both myasthenic and cholinergic along with what actions to take iv. to avoid stressors or how to minimize stressors VI. Seizure Disorders A. Definition/etiology 1. Sudden, transient alteration in brain function 2. Disorderly transmission of electrical activity in the brain 3. Causes a. cerebral lesions b. biochemical alteration c. cerebral trauma d. idiopathic B. A classification of seizure types: partial, simple, complex, generalized 1. Partial seizures a. focal motor b. seizure activity only in specific parts of the brain c. usually client remains conscious 2. Simple with findings associated with a. motor activity b. special sensory feelings c. autonomic activity d. psychic issues e. psychomotor actions f. no loss of consciousness 3. Complex a. impairment of consciousness b. secondarily generalized c. progressing to generalized tonic-clonic SEIZURE CLASSIFICATIONS A. Types of generalized seizures - one classification system 1. Absence seizures (petit mal seizures) 2. Myoclonic seizures (bilateral massive epileptic myoclonus) 3. Generalized tonic-clonic seizures (grand mal seizures) 4. Akinetic seizure B. Proposed international classification of epilepsies and epileptic syndromes 1. Idiopathic 2. Benign childhood epilepsy 3. Primary reading epilepsy 4. Symptomatic a. chronic progressive epilepsia partialis continua of childhood b. syndromes characterized by seizures with specific triggers 5. Cryptogenic a. presumed to be symptomatic but etiology is unknown b. differs from Symptomatic by lack of etiologic evidence 4. Generalized seizures: eight types a. petit mal - called absence seizures b. myoclonic i. sudden, uncontrollable jerking movements of one or more extremities ii. usually occurs in the morning c. clonic
  27. 27. i. characterized by violent bilateral muscle movements ii. hyperventilation iii. face contortion iv. excessive salivation v. diaphoresis vi. tachycardia d. tonic i. first, client loses consciousness suddenly and muscles contract bilaterally ii. body stiffens in opisthotonos position iii. jaws clenched iv. may lose bladder control v. apnea with cyanosis vi. pupils dilated and unresponsive vii. usually lasts less than a minute e. grand mal: most common type i. tonic-clonic movements bilaterally ii. may be preceded by prodromal iii. lasts two to three minutes iv. often incontinent of bowel/bladder v. after clonic phase, client is unresponsive for about five minutes vi. arms and legs go limp vii. breathing returns to normal viii. possible disorientation or confusion for sometime afterwards ix. possible headache and fatigue afterwards f. atonic: sudden loss of postural muscle tone with collapse g. unclassified seizures h. status epilepticus i. rapid sequence of seizures without interruption or pauses ii. medical and nursing emergency iii. client in postictal state when next seizure begins iv. sometimes occurs if a sudden stop of maintenance anticonvulsants v. if cerebral anoxia occurs, brain damage or death can follow vi. risk for severe organ and muscle hypoxia 5. Diagnostics a. by the event itself - see above b. history and physical exam c. electroencephalogram (EEG) d. computerized tomogram (CT) scan
  28. 28. 6. Management a. expected outcomes: to control or minimize the seizure activity and prevent complications b. correction of underlying problem c. medications i. benzodiazepines, I.V. such as diazepam (valium), lorazepam (ativan) for active seizures ii. hydantoin anticonvulsants such as phenytoin (dilantin) - maintenance iii. barbiturates such as phenobarbitol - maintenance iv. succinimides such as ethosuximide (zarontin) - maintenance 7. Nursing interventions a. administer medications as ordered b. seizure care c. seizure precautions d. teach client i. to wear MedicAlert jewelry ii. about medication effects, interactions, and side effects iii. to learn when a seizure may be triggered iv. techniques to reduce stress v. seizure care at home or at work vi. if in public area, after the tonic phase turn client to side SEIZURE CARE 1. Do not leave the client who is seizing 2. Attempt to prevent or break client's fall by assisting him/her to horizontal position on the bed or the floor 3. Loosen tight clothing around neck and chest 4. Remove objects near the client 5. Place a pillow under the client's head if possible and available 6. Place the client's head in a lateral position if possible to maintain airway 7. Place nothing in the client's mouth 8. Cover the client if possible 9. Document a. type of seizure - describe behavior rather than labeling b. duration c. activity during and if incontinence d. if any precipitating factors e. client's response - immediate, then at 15 minute intervals until stability is established VII. Headache A. Definition 1. Pain located in the upper region of the head 2. One of the most common neurologic complaints B. Classifications 1. Recurrent migraine headache a. onset during adolescence or early adulthood b. familial c. involves unilateral, throbbing pain d. subtypes i. classic migraine ii. common migraine
  29. 29. iii. cluster headache iv. hemiplegic headache v. ophthalmoplegic headache 2. Recurrent muscular-contraction headache (pressure, tension headache) a. most common form of headache b. may be direct result of stress, anxiety, depression, drastic changes in caffeine consumption 3. Nonrecurrent headaches a. occur with systemic infections and are usually associated with fever b. occur as the result of a lesion, after an invasive spinal cord procedure such as a lumbar puncture, or subarachnoid bleed c. caused by increased intracranial pressure C. Findings 1. Vary by type of headache 2. May include throbbing, nausea, vomiting, visual disturbance, tenderness, neck stiffness, and focal neurological signs D. Diagnostics 1. History and physical exam 2. Computing tomogram (CT) scan 3. Magnetic resonance imaging (MRI) E. Management of headaches 1. Expected outcomes: to alleviate pain and treat underlying cause 2. Vasoconstriction by pressure or cold 3. Management of migraine a. nonnarcotic analgesics usually when onset noted: aspirin, acetaminophen (Tylenol), ibuprofen b. narcotic analgesics: codeine, meperidine (Demerol), morphine c. alpha-adrenergic blocking agentblocker: ergotamine tartrate (Ergostat) without or with caffeine d. steroids: dexamethasone (Decadron) e. prophylactic treatment with beta-adrenergic blocking agents, serotonin antagonists, antidepressants, imipramine (Tofranil) f. avoid headache-precipitating foods such as MSG, tyramine, or milk products, or sudden stopping of caffeinated drinks 4. Management of cluster headaches - a type of migraine a. narcotic analgesics: codeine sulfate b. alpha-adrenergic blocking agentblocker: ergotamine tartrate (Ergostat) c. prophylactically with serotonin antagonists 5. Management of tension headaches a. nonnarcotic analgesics b. muscle relaxants c. prophylactically: antidepressants and/or doxepin (Sinequan) F. Nursing interventions 1. Suggest a quiet, dark environment 2. Manage pain by prompt medication administration or other comfort measures 3. Help client identify precipitating factors and actions for prevention 4. Keep NPO until nausea and vomiting subside 5. Teach client a. to keep a headache diary b. expected medication actions and side effects c. alternatives for pain relief including referrals for alternative approaches d. to avoid or minimize trigger factors
  30. 30. VIII. Head Trauma A. Classifications 1. Closed versus open injury a. closed is nonpenetrating; no break in the integrity of the skull b. open injury: skull is broken with the brain exposed 2. Severity a. mild: only momentary loss of consciousness with no neurological sequelae b. moderate: momentary loss of consciousness with a change afterwards in neurological function which is usually not permanent
  31. 31. c. severe: decreased LOC with serious neurological impairment and sequelae B. Types of skull fractures 1. Linear: simple break in the bone; no displacement of the skull 2. Depressed: part of skull is pushed in 3. Basilar: at base of skull; may extend into orbit or ear; ear or nose may leak CSF; most difficult to verify by x-ray 4. Concussion: temporary loss of neurologic function with complete recovery C. Types of bleeding or hematomas 1. Epidural a. usually something lacerates the blood vessels (arteries) of the middle meninges b. since this is arterial bleeding, the risk of death is greatest c. client commonly looses consciousness after injury then is lucid; then LOC drops quickly with the next 24 hours 2. Subdural a. something has lacerated the blood vessels (veins) crossing the subdural space b. acute: findings surface in 24 to 72 hours after injury with rapid neurologic deterioration
  32. 32. c. subacute: findings surface 72 hours to 2 weeks after injury with a slower progression of deterioration d. chronic: gradual clot formation over time, possibly months with minimal deterioration D. Progression of skull fracture injury 1. Onset: contusions and lacerations of nerve cells 2. Neuron death: gradual demyelinization of affected nerve fibers 3. Scarring: meninges adheres to injured area of brain E. Complications 1. Cerebral edema a. results in increased intracranial pressure b. results directly from cerebral ischemia, anoxia, and hypercapnia 2. Diabetes insipidus (DI) a. DI results from a decrease release of antidiuretic hormone (ADH) and body excretes too much fluid b. the increase in urinary output results in a low specific gravity c. more common in the initial acute phase of head injury 3. Stress ulcer a. head injuries activate both the sympathetic and parasympathetic systems b. stimulation of sympathetic system leads to gastric ischemia from vasoconstriction c. stimulation of parasympathetic system leads to increased release of hydrochloric acid (HCL) into the stomach d. steroid therapy may contribute to the development of ulcers since steroids increase HCL acid 4. Syndrome of inappropriate anitdiuretic hormone (SIADH) a. too much ADH is produced b. water is excessively retained - hemodilution c. urinary output decreases; urine specific granity increases effect d. more common in the chronic phase of care after a head injury 5. Seizure disorders 6. Infection: brain, lungs, urinary system from immobility 7. Hyperthermia or hypothermia F. Findings of head trauma 1. Degree of neurological damage varies with type and location of injury 2. Restlessness and irritability - initially 3. Decreased LOC - lethargy, difficulty with arousal 4. Headache 5. Nausea and vomiting - projectile vomiting indicates increased ICP G. Diagnostics 1. History and physical exam 2. Computerized tomogram (CT) scan 3. Magnetic resonance imaging (MRI) 4. Electroencephalogram (EEG) H. Management 1. Expected outcomes: to reduce or minimize increases in intracranial pressure and protect the nervous system 2. Medications for increased ICP a. osmotic diuretics; mannitol (osmitrol) - IV drip or push b. steroids: dexamethasone (decadron) - IV push c. barbiturate coma may be induced to treat refractory increased intracranial pressure 3. Surgical correction of underlying cause 4. Treatment for evident findings: seizures, fever, infection 5. Therapy a. nutritional support
  33. 33. b. physical c. speech d. behavioral e. occupational I. Nursing interventions 1. Provide care of the client with increased intracranial pressure a. seizure precautions b. seizure care c. care of the client on ventilator d. care of the client undergoing surgery 2. Monitor for balanced nutrition and fluids 3. Assist with ADL as indicated 4. Prevent complications of immobility 5. Monitor neuro vital signs 6. Give medications as ordered 7. Provide emotional support with appropriate referrals 8. Manage pain within agency's guidelines IX. Brain Tumors A. Growth of tissue within the brain tissue enclosed by the skull 1. May be cancerous or benign 2. Classified according to tissue type 3. May be primary or metastatic B. Findings 1. Depend on the size and the location of tumor 2. Locations and findings a. frontal lobe: personality changes - classic, focal seizures, visual disturbances, hemiparesis, aphasia b. occipital lobe: visual hallucinations, focal seizures c. temporal lobe: headache, seizures d. parietal lobe: visual losses, seizures e. cerebellum: coordination or mobility difficulties 3. Increased intracranial pressure as tumor enlarges C. Diagnostics 1. History and physical exam 2. CT scan 3. Magnetic resonance imaging (MRI) D. Management 1. Expected outcome: removal of the tumor with minimal harm to the nervous system 2. Depends on the location and size of the tumor 3. Treatment for associated increased intracranial pressure from tumors a. surgery b. craniotomy to remove tumor c. stereotactic laser surgery d. radiation therapy for malignancy 4. Medications for malignant tumors: chemotherapy E. Nursing interventions 1. Provide: a. care of the client with increased intracranial pressure from tumors b. care of the client undergoing I. surgery II. radiation therapy III. chemotherapy c. seizure precautions d. seizure care e. balanced nutrition and fluid
  34. 34. 2. Facilitate emotional support with referrals to support groups for the client and family X. Peripheral Nerve and Cranial Nerve Disorders A. Trigeminal neuralgia (tic douloureux) 1. Syndrome of paroxysmal facial pain a. occurs more often in middle age and older adults b. affects cranial nerve five (trigeminal nerve) c. has unknown etiology d. involves one side only e. is triggered by harmless events such as a breeze, hot or cold liquids 2. Findings a. intense facial pain lasting about one to two minutes along the nerve branches b. extreme facial sensitivity c. pain may be described as "burning" or "shooting" 3. Diagnostics: history and physical exam 4. Management a. expected outcomes: to relieve pain and to minimize frequency b. anticonvulsants: carbamazepine (tegretol), phenytoin (dilantin) c. surgery I. minor I. radio-frequency gangliolysis: heat destroys trigeminal ganglion II. glycerol gangliolysis: glycerol injected into subarachnoid space around gasserian ganglion II. major - microvascular compression: move arterial loop away from posterior trigeminal root 5. Nursing interventions a. help clients to name trigger points with identification of triggering incidents b. recommend restful environment with scheduled rest periods c. reinforce the need for balanced nutrition d. provide appropriate care of the client undergoing surgery e. teach client I. about medications and side effects II. to avoid triggering agents III. to chew on the opposite side of the mouth IV. to avoid drafts V. to avoid very hot or cold foods or fluids B. Facial nerve paralysis (bell's palsy) 1. Definition/etiology a. is a disorder of cranial nerve seven (facial nerve) b. involves one side only; unilateral c. has an unknown etiology d. often occurs during periods of high stress 2. Findings often occur suddenly over ten to 30 minutes a. ptosis b. cannot close or blink eye with excessive tearing
  35. 35. c. flat nasolabial fold d. impaired taste e. lower face paralysis f. difficulty eating - impaired mastication of food and difficulty swallowing 3. Diagnostics: history and physical exam 4. Management a. expected outcome: to restore cranial nerve function b. medications I. prednisone II. analgesics c. local comfort measures: heat, massage and electrical nerve stimulation for muscle tone d. alternative therapies: reiki, massage, imagery 5. Nursing interventions a. reinforce balanced nutrition with a soft diet b. administer drugs as ordered c. teach client I. to chew on the opposite side II. how to use protective eye wear during risk periods - patch or glasses over eye III. effects of steroids IV. the use of eye drugs or ointment to protect the eye from corneal irritation V. that once findings disappear their return may occur especially in times of high stress Points to Remember • In multiple sclerosis, early changes tend to be in vision and motor sensation; late changes tend to be in cognition and bowel control. • Peripheral nerves can regenerate. However, nerves in the spinal cord are thought to not be able to regenerate. • During a seizure, do not force anything into the client's mouth or attempt to suction the mouth. • A major problem often associated with a left-sided brain infarction (CVA) is an alteration in communication. • Clients with CVAs are at a greater risk for aspiration. Initially these clients must be evaluated to determine if dysphagia is present. • Changes in a client's respirations (rate, rhythm and depth) are more sensitive indicators of increases in intracranial pressure than blood pressure and pulse. • When caring for a comatose client, remember that the hearing is the last sense to be lost. • Clients after a CVA often have a loss of memory, emotional lability and a decreased attention span. • Communication difficulties of a client with a CVA usually indicate involvement of the dominant hemisphere, usually the left brain, and is associated with right sided hemiplegia or hemiparesis. • The client with myasthenia gravis will have more severe muscle weakness in the evening due to the fact that muscles weaken with activity - described as progressive muscle weakness - and clients usually regain strength with rest.
  36. 36. XI. Senses: Eye and Ear I. Eye structures A. Three layers of the eye: sclera, choroid, and retina 1. Sclera: maintains eye shape 2. Choroid: packed with blood vessels and pigmented to absorb light and prevent blurring of an image a. choroid forms iris and lens in front b. Schlemm's canal (venous sinus) circles where cornea and iris meet; iris gives eye its color c. muscles of iris adjust pupil d. pupil adjusts to i. protect retina ii. allow enough light to stimulate retina iii. improve depth perception iv. respond to sympathetic nervous system with dilation e. ciliary body (smooth muscle) contracts to reduce tension of suspensory ligament on the lens f. lens converges light onto the retina 3. Retina: inner, posterior layer that is photosensitive
  37. 37. a. consists of four layers i. pigmented epithelial cell ii. photoreceptor cells (rods and cones) iii. bipolar neuron iv. ganglion neuron b. optic disk: retinal area of optic disk contains no photoreceptors (blind spot) c. photoreceptor cells: turn light into nerve impulses to optic nerve, cranial nerve II i. rods: located more peripherally - around edges of retina I. black, white, gray vision II. peripheral vision ii. cones: located in fovea centralis I. three types: red, green, and blue receptors II. fine discrimination and color vision B. Optic nerve, cranial nerve II 1. Nerve fibers from median half of each retina cross at chiasm and travel to opposite sides of the brain 2. Nerve fibers from lateral halves of retina remain uncrossed C. Chambers 1. Anterior chamber (locus of intraocular pressure [IOP]) 2. Posterior chamber EYE STRUCTURES A. Chambers 1. Anterior chamber filled with aqueous humor a. Secreted near ciliary body b. Circulates through suspensory ligament and pupil and under cornea c. Exits through the canal of Schlemm d. Enhances light refraction e. Cleans and nourishes the eye structures f. Determines intraocular pressure: Normal 16-30 mm Hg 2. Posterior chamber a. Narrow passage behind the iris b. In front of the lens and the ciliary body B. Vitreous body 1. Filled with vitreous humor 2. Holds the retina in place C. Optic nerve 1. Nerves from each eye meet at the optic chiasm 2. Nerve fibers from median half of each retina cross at chiasm and travel to opposite sides of the brain 3. Nerve fibers from lateral halves of the retina remain uncrossed D. Vitreous body E. Lens 1. Separates the posterior chamber from the vitreous body 2. Are transparent 3. Are held in position by suspensory ligaments attached to the ciliary body F. Accessory structures 1. Protective structures: sockets, eyelids, eyelashes, eyebrows, conjunctiva
  38. 38. 2. Lacrimal duct: secretes and drains fluid that moistens and lubricates the front surface of the eye; with decreased blinking less secretions result with complaints of "dry" or maybe "itchy" eyes 3. Six oculomotor muscles surround and enter the eyeball II. Eye Functions A. Light reception 1. Light passes through the cornea, aqueous humor, lens, and vitreous body to the retina 2. The density of the cornea slows the light, and the curvature of the cornea bends the light (called refraction) 3. The lens further bends and redirects the light to a point on the retina 4. At this point, the light stimulates photoreceptor cells (rods, cones) which transmit electrical impulses 5. These impulses travel through the optic nerve to the brain B. Accommodation - decreases with aging and the loss begins int the 40 to 50 year olds 1. Process by which the lens changes shape to view an object at close range (or long range) 2. Proper vision requires three processes: a. convergence: image of the object falls exactly on the fovea centralis retinae of both eyes b. focus: focusing of the lens (ciliary body [ciliary muscles] to contract or relax) c. light regulations constriction or relaxation of the pupils to regulate light and to clarify the image on the retina 3. When muscles that carry out these three processes are weak or paralyzed the finding is called strabismus C. Binocular vision 1. Allows the brain to judge distance 2. Brain judges a. the difference between two images b. the amount of retina taken up by the image c. the difference between familiar and unfamiliar objects (example: person standing next to an elephant) d. the different shades of color 3. Both eyes must move together for clear focus (called conjugate eye movements). Thus, to immobilize one eye, both eyes must be covered
  39. 39. III. Disorders of the Eye Overview and content: eye disorders from the front to the back of the eye Eye disorders from most common to least common A. Disorders of refraction 1. Myopia (near-sightedness) - blurred distance vision, but clear close vision 2. Hyperopia (far-sightedness) - blurred close vision, but clear distant vision 3. Presbyopia - in middle age, lens loses elasticity with results of hyperopia 4. Astigmatism - lens refracts light rays to focus on two different points of retina B. Eye trauma care 1. Foreign body 1. use eversion procedure 2. if foreign body has penetrated, do not remove the foreign body 3. irrigate affected eye with sterile normal saline eye irrigant
  40. 40. 2. Corneal abrasion 1. disruption of the cells and loss of superficial epithelium 2. caused by trauma, chemical irritant, foreign body, or lack of moisture 3. findings: severe pain, blurred vision, halo around lights, lacrimation, inability to open eye, photophobia 4. diagnosis by fluorescein sodium dye 5. abrasions heal usually within 48 hours with no scarring or visual deficit 6. treatment includes short-acting analgesic drops, eye rest with soft or rigid eye patch 3. Corneal laceration 1. same causes and findings as with abrasions 2. lacerations are serious emergencies to require immediate attention 3. surgery is generally required 4. follow care for client undergoing eye surgery (see points to remember at the end of this section) 4. Penetrating injury 1. immediate care 1. do not remove the object 2. do not apply pressure of any kind to the eye or the object 3. cover the injured eye to protect movement of the object. may use a paper or plastic cup or rigid eye patch 4. cover uninjured eye with soft or rigid eye patch to avoid sympathetic movement 2. get client to emergency room immediately 3. surgery will be required 5. Chemical irritants 1. flush eye with plenty of tap water or sterile normal saline if available 2. get client to emergency room immediately 3. alkaline substances penetrate the cornea rapidly and must be removed quickly; these injuries are a priority to care for 4. acids coagulate the eye's proteins and often result in relatively superficial, reversible damage 6. Ultraviolet burns 1. often occur from sun exposure or welding flashes – looking at a welding flame without special glasses during the welding process 2. irritate epithelium, which swells and scales off (desquamation) 3. care is the same as with lacerations 7. General pharmacotherapy for eye trauma 1. topical anesthetics 2. topical anti-inflammatory 3. topical mydriatic-cycloplegic agents to prevent papillary constriction 8. General management of any eye trauma 1. do copious irrigation of the affected eye 2. apply bilateral rigid or soft eye patches to rest both eyes by decreased eye movement 3. have clients use tinted glasses for photophobia to reduce eye discomfort from artificial lights or sunlight 4. assist clients with activities of daily living as needed 5. review with clients to avoid activities which increase IOP C. Glaucoma - the second most common cause of vision loss in the USA; may be unilateral or bilateral
  41. 41. 1. Most common type: chronic open-angle glaucoma (simple, adult primary, primary open-angle) 1. etiology/epidemiology 1. hereditary link 2. unknown etiology 3. aqueous humor does not drain adequately which leads to increased intraocular pressure (IOP) 4. this pressure on optic nerve causes destruction of nerve fibers in the retina to result in a vision loss 2. findings 1. most clients are without findings until there is a loss of vision 2. peripheral vision loss is affected first prior to total loss of vision 3. three classic assessment findings 1. visual field loss (peripheral) 2. elevated IOP 3. cupping of the optic disk 3. diagnostics Diagnostic Eye Tests A. Electroretinography 1. Detects diseases of the rods and the cones 2. Evaluates the electrical potential between the retina and the cornea 3. Method: electrodes incorporated into contact lenses are used to measure the changes in the wavelength and intensity of light and for the state of adaptation of the eye B. Tonography 1. Indirect measurement of intraocular pressure (IOP) 2. Used to detect glaucoma C. Intravenous fluorescein angiography 1. Records the appearance of blood vessels within the eye 2. Used to evaluate for retinopathy and tumors 3. A contrast dye is injected intravenously and numerous photographs are taken of the fundus oculi 4. Check client for sensitivity or allergy to fluorescein dye prior to the test 5. Mydriatic drops are used to dilate pupil D. Ocular ultrasonography 1. Use of high frequency sound waves to evaluate eye structures 2. Particularly useful when eye is clouded with an opaque medium such as a cataract or hemorrhage E. Electronystagmogram: record of electrical activity of eye during spontaneous, positional and calorically-invoked nystagmus A. General nursing interventions in electrodiagnostic studies A. always explain test to client B. client must remain still during test unless instructed to do otherwise C. client should avoid stimulants before test
  42. 42. d. management i. expected outcomes - reduction of IOP and prevention of visual field defects ii. treatment of choice: pharmacotherapy • miotic eyedrops (parasympathomimetic agents) • carbonic anhydrase inhibitors - Diamox • beta-adrenergic blocking agents - Timoptic drops • epinephrine eyedrops (contraindicated in clients with cardiac conditions) - used more often in emergency care iii. trabeculectomy or laser trabeculectomy • performed when pharmacological agents are not effective • small piece of sclera containing the trabecular network is removed and an iridectomy is performed • cycloplegic and steroids eye drops are usually used • antibiotics may be ordered • a mydriatic eye drop medication is then used to prevent adhesions to the cornea; remember that use of this classification of medications is contraindicated with glaucoma e. nursing interventions i. for pharmacotherapy management • reinforce the need for compliance with medical treatment • teach client how to instill eye drops and when - usual recommended time is before bedtime • teach the need to reduce or eliminate safety risks related to impaired vision ii. for trabeculectomy by traditional surgery • monitor dressing for excessive bleeding • administer antiemetics, analgesics, mydriatics and antibiotics as ordered • assist the clients with ADL as needed iii. for trabeculectomy by laser surgery • discuss that vision may be blurred for first day or two post-op • teach to use soft or rigid eye patches or sunglasses for photophobia • discuss the use of analgesics as ordered iv. general education for clients with glaucoma • stress the need to avoid activities that increase IOP - bending, stooping, straining, coughing, blowing nose, laughing • stress the importance of routine eye exams- usually yearly or more often if complications or noncompliance with medication regimen 2. Less common type: acute closed-angle glaucoma (shallow, narrow-angle, or congested glaucoma) a. etiology /epidemiology
  43. 43. i. a medical and nursing emergency ii. iris lies near drainage channel (canal of Schlemm) and bulges forward against cornea, blocking the trabecular network with the result of increasing IOP iii. affects more women; usually after age of 45 b. findings i. sudden onset of blurred vision, halos or colored rings around white lights ii. sudden frontal headache iii. sudden severe eye pain, reddening of the eye, nausea, vomiting iv. followed by progression of findings as the pressure increases • profuse lacrimation • mildly dilated, nonreactive pupil • more severe nausea/vomiting • cornea appears hazy v. blindness may result in two to five days if left untreated c. diagnostics i. history of findings ii. ocular pressure readings d. management i. expected outcome: to prevent or minimize the damaging effects of acute closed-angle glaucoma ii. emergency pharmacologic treatment to decrease IOP • intravenous osmotic agents • topical miotic eye drops • systemic carbonic anhydrase inhibitors • systemic analgesics iii. surgery • iridotomy or iridectomy • procedure is usually then repeated on the unaffected eye e. nursing interventions i. monitor for effectiveness of medications as ordered ii. apply eyepatch or sunglasses for post-op photophobia iii. discuss with clients that vision is more often blurred for one to two days postsurgery iv. stress the importance of routine yearly or more frequent eye examinations v. teach clients to avoid activities that increase IOP D. Cataract 1. Etiology a. clouding of lens - may be unilateral or bilateral; one of the most common eye disorders b. first type: senile cataract - result of aging process c. second type: traumatic i. develops within a few months after eye trauma ii. painless but progressive loss of sight in one or both eyes 2. Findings • vision becoming clouded, blurred or dim • Sensitivity to light and glare • Halos around lights • Fading or yellowing of colors • Double vision or multiple vision in one eye • You might find it harder to see at night

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