Assessment Of Cardiovascular FunctionPresentation Transcript
Assessment of Cardiovascular Function
Elicit a description of present illness and chief complaint
precipitating and alleviating factors
Common Symptoms Of Cardiovascular Disease
Chest discomfort or pain
One of the most important manifestations of cardiac ischemia
Other causes – pulmonary embolus, GERD, esophageal spasm
Assume chest discomfort is related to ischemia unless proven otherwise, especially if risk factors or history of CAD
Little correlation between severity of pain and gravity of situation
Dysrhythmias or arrhythmias
Stress, caffeine, drugs
Mitral valve disease
Ask about “skipped’ beats, irregular beats, fluttering, racing
Inquire about dizziness or fainting
Syncope or Changes in Mentation
Inquire about associated symptoms
Easy fatigability with mild exertion is common
Often associated with myocardial ischemia
Primary symptom of pulmonary congestion from LV failure
Different forms of dyspnea
Exertional dyspnea (DOE)
Paroxysmal nocturnal dyspnea (PND)
Cough and Hemoptysis
Ask about the quality
Ask about frequency
If hemoptysis present, ask if streaks of blood, pink tinged
Weight Gain, Dependent Edema and Nocturia
As heart fails, fluid accumulates
Increase of 3 lbs or more in 24 hr is fluid accumulation
Inquire about weight gain, fitting of shoes, or tightening of clothes around waist
Nocturia - kidneys inadequately perfused by weak heart and receive increased blood flow during night – output increases
Past Medical History
Inquire about previous illnesses
Rheumatic fever, autoimmune diseases
Diabetes, kidney disease, HPN, dyslipidemia
Explore previous hospitalizations and surgeries
Evaluate use of medications, OTC drugs, herbs, recreational drugs
Are meds taken as prescribed
Knowledge about meds
Family Health History
Inquire about diabetes, kidney disease, stroke, heart disease, hypertension (HPN)
Inquire about health of parents and siblings
Marital status, children and relationships
Coping and stress tolerance
Health habits – diet, exercise, smoking, alcohol use
Look at the client and consider
Does the client lie quietly or is he restless?
Can the client lie flat or must be upright?
Do facial expressions reflect pain or distress?
Are there signs of cyanosis or pallor?
Note level of consciousness (LOC)
Assess the following areas – general build and appearance of the client, as well as skin color; distress level; LOC; presence of SOB; position and verbal responses.
♦ Client with chronic heart failure may appear malnourished, thin and cachectic. Latest signs of severe heart failure are ascites, jaundice, and anasarca as a result of prolonged congestion of the liver. Heart failure may cause fluid retention and clients may have engorged neck veins and generalized dependent edema.
♦ CAD is suspected in client with yellow lipid-filled plaques on the upper eyelids (xanthelasma) or earlobe creases. Clients with poor CO and decreased cerebral perfusion may have mental confusion, memory loss and slowed verbal responses.
Inspection Of Skin and Nails
Assess skin color
Peripheral cyanosis-nose, ears, periphery
Central cyanosis-mucous membranes, lips
Assess skin temperature and moistness
Assess for ecchymosis
Assess for wounds, scars, implanted devices
♦ Assess the client’s hands, arms, feet and legs for skin changes, clubbing, capillary filling and edema, skin mobility and turgor.
♦ Vascular changes of an affected extremity may include paresthesia, muscle fatigue and discomfort, pain, coolness, and loss of hair distribution from a reduced blood supply.
♦ Clubbing of the fingers and toes result from chronic O2 deprivation in the tissue beds. It can be identified by assessing the angle of the nailbed. The angle of the normal nail bed is 160°, with clubbing, the angle of the nailbed increases to > 180° and the base of the nail becomes spongy.
Assess Vital Signs
Measure BP in both arms initially
Calculate pulse pressure
Normal value between 30-40mm Hg
A widened pulde pressure may indicate aortic regurgitation
A narrowed pulse pressure may be associated with tachycardia, cardiac tamponade, pericardial effusion, or aortic stenosis
Perform postural checks
Blood Pressure Measurement
1. Postural BP – blood pressure normally drops when a client moves from a flat supine position to a sitting or standing position. Normally the client may report dizziness or lightheadedness, but these symptoms quickly pass and are transient.
Postural (orthostatic) hypotension – occurs when the client’s BP is not adequately maintained when moving from a lying to a sitting or standing position. It is defined as a BP fall of more than 10-15mmHg of the diastolic pressure and a 10% - 20% increase in HR.
2. Paradoxical BP – an exaggerated decrease in systolic BP by more than 10 mmHg (normal is 3-10mmHg) during the inspiratory phase of the respiratory cycle. It is sometimes referred to as pulsus paradoxus.
Assesses heart rate and rhythm
Various pulse patterns may be indicative of disease processes
Pulsus alterans: a regular rhythm but amplitude varies from beat to beat which may indicate left heart failure
Bigeminal pulse: a normal beat alternating with premature contractions, every other beat having a decreased amplitude. This may indicate cardiac dysrhythmia.
Pulsus paradoxus: a regular rhythm with decreased amplitude resulting in a drop in systolic BP on inspiration, and increased in expiration. It may be present with constrictive pericarditis, pericarditis, and severe COPD
Absent, weak, normal or bounding pulse: a bounding pulse may indicate increased cardiac output while a diminished or absent pulse may indicate a decreased CO or an occlusion.
Carotid pulse: should be visualized for pulsations, palpated for thrills, and auscultated for bruits. While inspecting the neck, assess for jugular vein distention.
Pulse Quality Scale
0 pulse not palpable or absent
+1 weak, thready, difficult to palpate
+3 easy to palpate, full pulse
+4 strong, bounding pulse
Assess Neck Vessels
Determine jugular venous pressure
Gives us an estimate of right heart function and CVP
Measurements >3 cm are elevated –jugular venous distention (JVD)
Assess carotid arteries
Assess amplitude of pulse
Auscultate for bruits
Assess the heart by inspecting the chest for pulsations and palpate for thrills. The area for auscultation include:
Aortic: located right sternal border, 2 nd intercostal space
Pulmonary: located at the left sternal border, 2 nd intercostal space
Mitral: located at the left sternal bordel, 5 th intercostal space
Erbs Point: located at the left sternal border, 3 rd intercostal space
Tricuspid: located at 4 th intercostal space midclavicular line
Apical: located at the 5 th intercostal space, midclavicular line
Asucultate for presence and type of murmurs
Normal Heart Sounds
1. 1 st heart sound (S 1 ) – is created by the closure of the AV valves. It is softer and longer, it is of low-pitch and is best heard at the lower L sternal border or the apex of the heart.
2. 2 nd Heart sound (S 2 ) – is caused mainly by the closing of the semilunar valves. It is shorter, high-pitched and is best heard at the base of the heart at the end of ventricular systole.
Abnormal Heart Sounds
Paradoxical splitting – an abnormal splitting of S 2 which is a characteristic of a wider split heard on expiration. It is heard in clients with severe myocardial depression causing early closure of the pulmonic valve or a delay in aortic valve closure. Common in MI, aortic stenosis, aortic regurgitation.
2. Gallops – diastolic filling sounds S 3 and S 4 are produced when blood enters a noncompliant chamber during rapid ventricular filling .
a. S 3 (Ventricular gallop) - is produced during the rapid filling phase of ventricular diastole when blood flows from the atrium to a noncompliant ventricle.
♦ It is probably a normal finding in children or young adults up to 40 years old. Over age 40 is considered pathological and may indicate ventricular overload as in mitral, aortic, or tricuspid regurgitation. It is heard just after S 2, early in diastole and may sound similar to “Ken-tuck-y”
b. S 4 (Atrial gallop) – always abnormal, usually associated with increased resistance to ventricular filling, such as with CHF, CAD, and aortic stenosis. It is heard in late diastole, but just before S 1 , and may sound similar to “Ten-ne-see”
3. Murmur – reflects turbulent blood flow through normal or abnormal valves.
♦ Grading of Murmur
Grade I – very difficult to hear, no thrill
Grade II – quiet but easily heard, no thrill
Grade III – fairly loud, no thrill
Grade IV – loud, possible thrill.
Grade V – very loud, accompanied by a palpable thrill and audible with the stethoscope partially off the client’s chest.
Grade VI – extremely loud, may be heard with the stethoscope slightly above the client’s chest
4. Pericardial Friction Rub – a harsh, scraping sound heard when the layers of the heart rub together due to an inflammatory process. Easily heard throughout the cardiac cycle in the lower sternum and apical areas.
5. Ejection clicks- heard in early systole, may signify aortic valve dysfunction
6. Opening snaps- heard in early diastole, associated with stenosis of mitral valve
Assess Respiratory Status
Respiratory findings frequently exhibited by cardiac clients
Assess O 2 saturation
Inspection may reveal ascites
Palpation may reveal an enlarged liver
Assess for elevated JVD
Auscultate for bruit over umbilicus
A. Laboratory Tests – this is done to establish a diagnosis, to detect concurrent disease, to assess risk factors and to monitor response to treatment.
1. Serum Cardiac Enzymes – events leading to cellular injury cause a release of enzymes from intracellular storage.
a. Creatine Kinase (CK) – an enzyme specific to cells of the brain, the myocardium, and the skeletal muscles. The presence of CK in the blood indicates tissue necrosis or injury and CK levels follow a predictable rise and fall during a specified period of time.
CK-MB – most specific enzyme analyzed in acute MI. the first enzyme levels to increase.
2. Lactate Dehydrogenase (LDH) – is widely distributed in the body and is found in the heart, liver, kidneys, brain and erythrocytes.
LDH1 and LDH2 are found in the heart. If the serum level of LDH1 is higher than the concentration of LDH2, the pattern is said to have flipped, signifying myocardial damage.
3. Aspartate Aminotransferase (AST) – previously known as serum glutamic-oxaloacetic transaminase (SGOT). Like LDH, it is not specific to cardiac muscle tissue.
V. Diagnostic Assessment
2. Serum Lipids
Elevated lipid levels are considered a CAD risk factor. Cholesterol, triglycerides and the CHON components of HDL and LDL are evaluated to assess the client’s degree of risk for CAD. A serum cholesterol greater than 260mg/dl gives a client three times greater risk of CAD than a serum level of 200mg/dl.
A nonfasting blood sample for the measurement of serum cholesterol level is acceptable. However, if triglycerides are to be evaluated, the physician obtains the specimen after a 12-hour fast.
3. Blood Coagulation Tests – evaluate the ability of the blood to clot and are important in clients with a greater tendency to form thrombi. They are also important for clients receiving anticoagulant therapy.
a. Prothrombin Time (PT) – is used when initiating and maintaining therapy with oral anticoagulants such as Na Warfarin (Coumadin, Warfilone). It measures the activity of the prothrombin, fibrinogen and other clotting factors.
☻ 11-16 secs
b. Partial Thromboplastin Time (PTT) – is assessed in clients receiving Heparin (Hepalcan). It measures deficiency in all coagulation factors, except factors VII and XIII.
☻ 60-70 secs
c. activated Partial Thromboplastin Time (aPTT) - most specific for heparin treatment
☻ 35-45 secs
4. Arterial Blood Gases (ABG) – determination of tissue oxygen, CO2 removal and acid-base status is essential to appropriate intervention and treatment
5. Serum Electrolytes
Cardiac effects of hypokalemia include increased electrical instability, ventricular dysrythmias, the appearance of U wave on the ECG and an increased risk of digitalis toxicity. The effects of hyperkalemia in the myocardium include slowed ventricular conduction and contraction, followed by asystole (cardiac standstill).
Cardiac manifestations of hypocalcemia are ventricular dysrythmias, prolonged QT interval and cardiac arrest. Hypercalcemia shortens the QT interval and causes AV block, digitalis hypersensitivity and cardiac arrest.
Serum sodium values reflect fluid balance and may be decreased, indicating a fluid excess in clients with heart failure.
6. Complete Blood Count (CBC)
The erythrocyte count is usually decreased in rheumatic fever and subacute infective endocarditis. It is increased in heart disease characterized by inadequate tissue perfusion.
Decreased Hgb and Hct levels indicate anemia and can manifest as angina or aggravate heart failure.
The leukocyte count is typically elevated after MI and in various infections and inflammatory disease of the heart (e.g., pericarditis, infective endocarditis)
B. Radiographic Examinations
1. Chest Radiography (Chest X-Ray) – assesses cardiac enlargement, pulmonary congestion, cardiac and placement of central venous catheters, ET tubes and hemodynamic monitoring devices.
2. Cardiac Fluoroscopy – a simple x-ray examination that reveals the action of the heart. It is used to place and position intracardiac catheters and IV pacemaker wires and can also be helpful in identifying abnormal structures, calcifications and tumors of the heart.
3. Angiography or arteriograph is a medical imaging technique used to visualize the inside, or lumen, of blood vessels and organs of the body, with particular interest in the arteries, veins and the heart chambers. This is traditionally done by injecting a radio-opaque contrast agent into the blood vessel and imaging using X-ray based techniques such as fluoroscopy. The word itself comes from the Greek words angeion , "vessel", and graphein , "to write or record". The film or image of the blood vessels is called an angiograph , or more commonly, an angiogram .
a. The radiologist will explain the procedure and the risks to the client before signing the consent.
b. Assess for allergy reaction to iodine-containing substances such as sea foods .
c. Shave and scrub the area that will be catheterized.
d. Most often, the femoral artery is used. The nurse must document VS and mark and describe pedal pulses in the client’s medical record.
Follow – up Care:
1. Bed rest in supine position for 8-12 hours. Make sure that the extremity that was catheterized is not flexed during this time.
2. A pressure dressing or bandage is kept in place over the injection site, a sand bag over the dressing may be used.
3. Assess the insertion site for bloody drainage or hematoma formation.
4. Assess the distal pulses and compare skin temperature in the affected extremity with that of opposite extremity.
5. The radiologist must be informed immediately if bleeding, loss of pulses, or changes in the VS occur.
6. Administer the prescribed IVF or oral fluids to facilitate elimination of contrast medium.
4. Cardiac Catheterization – the most definitive but most invasive test in the diagnosis of heart disease. It includes the study of right and/or left side of the heart and the coronary arteries.
a. To confirm suspected heart disease, including CAD, myocardial disease, valvular disease and valvular dysfunction.
b. To determine the location and extent of the disease process
c. To determine whether cardiac surgery is necessary.
d. To evaluate effects of medical treatment or cardiovascular function and CABG patency.
Resting ECG (12 Leads ECG) – An electrocardiogram ( ECG or EKG ) is a recording of the electrical activity of the heart over time produced by an electrocardiograph , usually in a noninvasive recording via skin electrodes. Its name is made of different parts: electro , because it is related to electrical activity, cardio , Greek for heart, gram , a Greek root meaning "to write".
provides information about cardiac dysrythmias, myocardial ischemia, the site and extent of MI, cardiac hypertrophy, electrolyte imbalance and effectiveness of cardiac drugs.
The 12-Lead view
Each limb lead I, II, III, AVR, AVL, AVF records from a different angle
All six limb leads intersect and visualize a frontal plane
The six chest leads (precordial) V1, V2, V3, V4, V5, V6 view the body in the horizontal plane to the AV node
The 12 lead ECG forms a camera view from 12 angles
Views from Augmented and Limb Leads- Frontal 2004 Anna Story
Precordial lead snapshots
Think of each precordial lead as a horizontal view of the heart at the AV node
With the limb leads and the precordial leads you have a snapshot of heart portions
Unipolar and Bipolar
Limb leads I, II, III are bipolar and have a negative and positive pole
Electrical potential differences are measured between the poles
AVR, AVL and AVF are unipolar
No negative lead
The heart is the negative pole
Electrical potential difference is measured betweeen the lead and the heart
Chest leads are unipolar
The heart also is the negative pole
Lead Placement is Important
Each positive electrode acts as a camera looking at the heart
Ten leads attached for twelve lead diagnostics. The monitor combines 2 leads.
Mnemonic for limb leads
White on right
Smoke(black) over fire(red)
Snow(white) on grass(green)
Precordial Leads 2004 Anna Story
Placement of the precordial leads are very important. In order to remember where the leads are placed you can remember the Rule of Four
V1 is at the 4th intercostal space just right of the sternum
V2 is at the 4th intercostal space just left of the sternum
V3 is halfway between V3 and V4
V4 is at the palpable apex or at the 5th intercostal space in the midclavicular line
V5 is in the same horizontal plane a V4 in theanterior axillary line
V6 is in the same horizontal plane as V4 in the mid axillary line
Where the positive electrode is positioned, determines what part of the heart is seen! I and AVL II, III and AVF V3 & v4 V1 & v2 V5 & v6
The ECG Tracing: Waves
Marks the beginning of the cardiac cycle and measures the electrical impulse that causes atrial depolarization and mechanical contraction
Duration: 0.06-0.11 sec
Measures the impulse that causes ventricular depolarization
Important indicator of ventricular myocardial cell activity
Q-wave- may or may not be evident on the ECG, represents septal depolarization
R-wave- first upward deflection following P wave
S-wave- the first downward deflection following the R-wave
Marks ventricular repolarization that ends the cardiac cycle
Intervals and Segments
Time interval for impulse to go from the SA to the AV node
normal 0.12-0.20 secs
Time interval for impulse to go from AV node to stimulate Purkinjie fibers
Less than 0.12 secs
Time interval from beginning of depolarization to the end of repolarization
Duration: <0.44 sec
end of the S to the beginning of the T
Represents the beginning of ventricular repolarization
B. Ambulatory ECG (Holter Monitoring) – allows continuous recording of cardiac activity during an extended period (usually 24 hours) while the client is performing the usual ADL. Preparation: b.1. Encourage the client to maintain a normal day’s schedule. b.2. Instruct to keep a diary, or log, in which to note the time of activities, such as eating, sleeping, walking, and working and to record any symptoms such as chest pain, lightheadedness, fainting and palpitations b.3. Instruct the client to avoid operating heavy machinery, using electric shavers and hair dryers and bathing or showering. These activities may interfere with the ECG recorder
c. Exercise ECG (Stress Test/Exercise Tolerance Test)- assesses the CV response to an increases workload. The stress test helps to determine the heart’s functional capacity and screens for asymptomatic CAD. Dysrythmias that develop during exercise may be identified and the effectiveness of antidysrythmic drugs can be evaluated.
c.1. The client must be adequately informed about the purpose and the risks involved. A written consent must be obtained.
c.2. Assure the client that the procedure is performed in a controlled environment with prompt nursing and medical attention available.
c.3. Instruct the client to get plenty of rest the night before the procedure. The client should not eat anything after going to bed or at least within 2 hours before the test. The client should not smoke or drink alcohol or caffeine-containing beverages on the day of the test.
c.4. Advise client to wear comfortable, loose clothing and rubber-soled, supportive shoes.
c.5. instruct the client to tell the physician if any symptoms, such as chest pain, dizziness, SOB and an irregular HR are experienced during the test.
c.6. Emergency supplies such as cardiac drugs, defibrillator and other equipment necessary for resuscitation are available in the room in which the stress test is performed.
7. Echocardiography – is a non-invasive, risk-free test and is easily performed at a client’s bed side or an outpatient basis.
often referred to in the medical community as a cardiac ECHO or simply an ECHO , is a sonogram of the heart. Also known as a cardiac ultrasound , it uses standard ultrasound techniques to image two-dimensional slices of the heart.
8. Hemodynamic Monitoring – provides quantitative information about vascular capacity, blood volume, pump effectiveness, and tissue perfusion.
It is often referred to as direct monitoring because it involves procedures that directly measure pressures in the heart and great vessels
Right Atrial, Pulmonary Artery, and Pulmonary Wedge Pressures - a pulmonary artery catheter is a triple-lumen or quadruple-lumen catheter with the capacity to measure right atrial and indirect left atrial pressures or pulmonary artery wedge pressure (PAWP). The CO may also be obtained from the catheter.
RA pressure is measured by a pressure sensor on the catheter inside the RA. Normal RA pressure ranges from 1-8 mmHg. Increased RA pressures may occur with right ventricular failure, whereas low right atrial pressure is usually indicative of hypovolemia
Normal pulmonary artery pressure (PAP) is 20-30mmHg systolic and 8-12mmHg diastolic, with a mean of 10-20mmHg and may be constantly visible on the monitor
Pulmonary capillary wedge pressure (PCWP) provides an indirect estimate of left atrial pressure (LAP). Normal PCWP is 8-12mmHg Elevated PCWP are usually indicative of pulmonary congestion.
b. CVP Monitoring – CVP is similar to RA pressure, but CVPs are measured in cm H2O rather than mmHg. A normal CVP is 3-8 cm H2O. Central venous pressure (CVP) describes the pressure of blood in the thoracic vena cava, near the right atrium of the heart. CVP reflects the amount of blood returning to the heart and the ability of the heart to pump the blood into the arterial system.
Elevated CVPs may indicate hypervolemia, low CVP may indicate hypovolemia.
How to Obtain a CVP Reading?
b.1. position the H2O manometer so that
the zero mark on the air-fluid
interface is at the same height
as the phlebostatic axis.
b.2. Turn the stopcock to fill the manometer with IVF.
b.3. Turn the stopcock to record the CVP. With each respiration, the fluid level in the manometer should fluctuate. When the level has stabilized, read the highest level of the fluid columns.
b.4. Return the stopcock to resume the flow of IVF to the client.