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CRITICAL CARE
BY
PROF
Ibrahim elghazawy
2014
Critical Care
Patients needing ITU care
Emergency
 Multiple trauma (including burns)
 Leaking AAA
 Severe acute pancreatitis
 Post-operative complications:
- Surgical
- Cardiac
- Respiratory
- Renal
 Severe spesis
Elective
 Major vascular eg, AAA
 Oesophagectomy
 Cardiac operations
 Major procedures
- Whipple’s
- Patients in ASA 2 category or
more
Critical Care
Indications for ICU transfer
 Potential incipient or actual organ failure in a remediable condition
 Advanced monitoring of organ function
 Treatment of organ failure:
Heart – use of inotropes
Lungs – ventilation
Kidneys – renal replacement therapy
 A need for 1:1 nursing
Critical Care
Tools for critical care
Respiratory
 Pulse oximetry
- O2 saturation of arterial blood
 Capnography
- CO2 tension in expired gas
Cardiovascular
 Arterial lines
 CVP
 Pulmonary artery
flotation catheter
(PAFC)
 Cardiac output
measurement
Critical Care
Pulse oximetry
 95% - 100% = normal
 93% =Warning!
 < 90% = patient is in severe trouble
Critical Care
Pulse oximetry
 Gives estimate of percentage saturation of
oxygen binding sites
 Related to Pa02 by oxygen dissociation
curve
Capnography
 Infra-red absorption through gas stream
 Relies on rapid equilibration of CO2 between
alveolus and pulmonary capillary
 Useful guide to PaCO2 but beware of lung
disease
 Continuous measurement
Critical Care
Critical Care
Arterial line
Indications
 Continuous BP
measurement
 Access for serial
arterial blood gas
analysis
Complications
 Bleeding
 Thrombosis
 Infection
 Pseudoaneurysm
 Accidental drug
injection
Site the line in the radial artery of the non-dominant hand. Allen’s test should be
performed.
Critical Care
Arterial Line
Allen’s test
The fist is tightly clenched, both wrist pulses are
tightly obstructed and the fist then released.
Pressure is released from the ulnar artery first.
Allen’s test is positive when the medial part of the
hand remains blanched.
Critical Care
Central venous catheterisation
Indications
 Invasive monitoring for estimation of fluid status and right heart function
 Long term infusions: TPN, chemotherapy
 Haemodialysis
 Lack of peripheral venous access
 Access for pulmonary artery catheterisation
Critical Care
Central venous catheterisation
Complications
 Inadvertent - arterial puncture
- thoracic duct puncture
- lung puncture
 Air embolus
 Catheter-related sepsis
 Clot formation
 Malposition and rupture of vein
Critical Care
Pulmonary artery wedge pressure
(PWAP)
It is an accurate representation of the left
atrial pressure which closely parallels the
left ventricular end-diastolic pressure thus
helping to guide fluid therapy.
Critical Care
Pulmonary artery wedge pressure
Introduced in 1970s by two cardiologists, Drs Swan
and Ganz. Used to measure:
 Pressure within the pulmonary artery
 Pulmonary artery wedge pressure
 Cardiac output by thermodilution or dye dilution
method
 Sampling of mixed venous blood
Critical Care
Pulmonary artery catheterisation
Indications
 Complex operations in patients with complex
cardiopulmonary disease
 Multisystem failure
 Major trauma
 Sepsis
 Situations where accurate haemodynamic status needs to be
ascertained
Critical Care
Pulmonary artery wedge pressure
Complications
 Valvular damage
 Ventricular rupture
 Pulmonary artery rupture
 Aneurysm or infarction
 Those of central venous catheterisation
Critical Care
Standard values
 Central venous pressure (CVP): 0-6 mm Hg
 Right ventricular pressure: 25 mm Hg
 Pulmonary artery pressure (PAP): 25 mm Hg
 Wedge pressure (PAWP): 6-12 mm Hg
 Cardiac index (CI): >2.8-3.6 L / min / m2
 Systemic vascular resistance(SVR):770-1500 dynes / sec / cm2
 Oxygen delivery: 600ml / min / m2
 Oxygen consumption: 150 mls / min / m2
Critical Care
A 60 year old man had a right
hemicolectomy. On the 1st postoperative
day he has developed a temperature of 390
C, is very short of breath and looks slightly
cyanosed; his oxygen saturation is 92%.
What will you suspect and how will you
manage the condition?
Critical Care
Postoperative pulmonary collapse
Although atelectasis and collapse are often
used synonymously, atelectasis strictly
speaking refers to lung parenchyma that
has never been expanded.
Critical Care
Postoperative pulmonary collapse
Clinical features
 Tachypnoea
 Pyrexia
 Productive cough
 Cyanosis
 Dullness on percussion
 Bronchial breathing
Critical Care
Postoperative pulmonary collapse
Management
 Antibiotic – amoxycillin
 O2 therapy with inspired O2 concentration of 30-40% with
humidification
 Vigorous physiotherapy + / - iv Doxapram
 Urgent fibreoptic bronchoscopy
 Minitracheostomy
Continue with physiotherapy and monitor with blood gases and
pulse oximetry- aim for oxygen tension to be no less than 10kPa
Critical Care
Postoperative pulmonary collapse
This arises from reduced ventilation of the lung bases
resulting in accumulation of bronchial secretions. This may
be basal, segmental, lobar or complete lung collapse. The
degree of hypoxia depends upon the extent of collapse.
Infection with consolidation supervenes with the organisms
being Haemophilus influenza, streptococcus pneumoniae,
coliform, MRSA and pseudomonas.
Critical Care
Post-operative hypoxia
Surgical patients at risk of hypoxia
 Smokers
 Chronic pulmonary disease
 Elderly
 Obesity
 Pre-operative opiates and sedatives
 Abdominal emergency surgery
 Orthopaedic surgery (fat emboli)
Critical Care
Effects of post-operative hypoxia
 Central nervous system
- Obtunded pain sensation
- Post-operative confusion
 Cardiovascular system
- Tachycardia
- Myocardial ischaemia
 Respiratory system
- Hypercapnoea (airway obstruction)
- Respiratory muscle failure
 Renal - Renal failure
Critical Care
Effects of post-operative hypoxia (contd)
 Gastrointestinal - Ulceration
- Reduced immunoprotection
 Hepatic - Ischaemic necrosis of hepatocytes
 Haematological - Reduced platelet function
- Coagulation problems
 Wound healing - Impaired wound healing
Critical Care
Respiratory failure
Respiratory failure is defined as an
arterial oxygen tension (PaO2) at sea
level of less than 8 kPa, i.e. hypoxia
due inadequate gas exchange within
the lung.
Critical Care
Respiratory Failure
Type I
Hypoxia
Failed O2 uptake
PaO2 <8kPa (Hypoxia)
+
Normal PaCO2 (7kPa) or low
Critical Care
Respiratory Failure
Type II
Hypoxia + Hypercapnia
Failed O2 uptake + Failed CO2 removal
PaO2 < 8kPa
+
PaCO2 > 7kPa
Critical Care
A 65 year old lady had a hip replacement 10
days ago. She is ready to be discharged.
She went to the toilet just prior to leaving
the ward for home. She collapsed in the
toilet. What is your diagnosis and
management?
Critical Care
Pulmonary embolus
Clinical diagnosis
 Dyspnoea
 Tachypnoea
 Pleuritic chest pain
 Small haemoptysis
 Calf tenderness and swelling
Critical Care
Pulmonary embolus
Management
 Resuscitation
 Investigations
 Treatment
Critical Care
Pulmonary embolus
Management
 The stable patient
 The unstable patient
Critical Care
Pulmonary embolus
Investigations
The stable patient
 ECG & CXR; blood gases
 VQ scan
 Duplex Doppler u/s of leg veins
 Pulmonary angiogram
 Contrast venography & plethysmography
Critical Care
Pulmonary embolus
Investigations
The unstable patient
 Echocardiogram
 Pulmonary angiogram
 Spiral CT – very sensitive
Critical Care
Pulmonary embolus
Treatment
 Anticoagulation
 Emergency embolectomy
 IVC filters
 Thrombolysis – in haemodynamically unstable
patient with refractory shock
- Intravenous
- Pulse spray directly into embolus
Indications for insertion of IVC filter
Therapeutic
 Recurrent PE despite effective anticoagulation
 Anticoagulation is contraindicated
 Post pulmonary embolectomy to prevent recurrence
 Pulmonary hypertension from chronic recurrent PE
 Extensive PE
 Iliofemoral DVT propagation despite adequate anticoagulation
 Free-floating IVC thrombus
 Bilateral free-floating DVT
Prophylactic
 Venous thrombolysis ( 20% develop PE )
 Hip and knee replacement ( controversial )
 Multiple trauma ( controversial )
Critical Care
Shock
Definition
Shock is a clinical state and is
defined as inadequate tissue
oxygenation which leads to
impairment of cellular function.
Critical Care
Shock
Clinical features
 Hypotension
 Tachycardia
 Tachypnoea
 Cold, clammy extremities
 Sweating
Critical Care
Shock
Types
 Hypovolaemic
 Septicaemic
 Cardiogenic
 Neurogenic
 Anaphylactic
Critical Care
A 60 year old patient of ASA 1 anaesthetic
risk underwent a total gastrectomy for
cancer stomach. While in the ITU, 12 hours
postoperatively, his BP has fallen to 80 mm
hg systolic, has not put out any urine over
the last 3 hours and is hypoxic with O2
saturation of 92%. What will you suspect
and how will you manage?
Critical Care
Answer
Post-operative hypotension from bleeding
Q. Where would the bleeding come from?
Slipped left gastric artery ligature
Q. Where does the left gastric artery arise from?
The coeliac axis
Critical Care
Post-operative hypotension
Investigations
 Monitor BP
 Continuous ECG, pulse oximetry
 Monitor urine output
 Monitor core and peripheral temperature
 Blood samples: U&Es,FBC, Cross match
Coagulation screen
Critical Care
Post-operative hypotension
Management
 ABC
 Oxygen
 Raise legs
 IV Fluids
 CVP line – particularly in over 60 years
 Control bleeding – re-exploration
Critical Care
Hypotension
One of the commonest post-operative complications
Definition
Systolic BP < 90 mm hg
or
Reduction from usual BP of > 30%
Critical Care
Hypotension
Causes
 Inadequate pre-load
 Decreased contractility
Critical Care
Causes of inadequate pre-load in hypotension
Absolute reduction of fluid
 Blood loss (obvious or
occult)
 Dehydration with
inadequate fluid
replacement
Relative reduction of fluid
 Venodilatation
 Mechanical interference
- tension pneumothorax
- pulmonary embolism
- tachycardia
- arrythmia
Critical Care
Causes of decreased contractility in hypotension
Toxic
 Ischaemic
 Hypoxic
 Acidosis
 Drugs
 Electrolyte disturbance
 Sepsis
 Jaundice
Mechanical
 Fluid overload
 Cardiac tamponade
Critical Care
A 60 year old woman has been admitted as
an emergency with a 4 day history of
severe right upper quadrant pain, vomiting,
jaundice and intense pruritis and is very
toxic – high temperature with rigors and
hyperdynamic circulation. What will you
suspect and outline the management.
Critical Care
Septic shock from acute calculous biliary obstruction
+/- Acute pancreatitis
Management
 Resuscitation
 Confirmation of diagnosis
 Definitive treatment
Critical Care
Acute calculous biliary obstruction
+
Septic shock +/- Acute pancreatitis
Resuscitation
 Analgesia
 IV Dextrose; Mannitol; Antibiotics after blood
culture
 Urinary catheter
 CVP line
Critical Care
Acute calculous biliary obstruction
Investigations & definitive treatment
 Blood: Culture, U&Es, FBC, CRP, LFTs,
Serum amylase, Coagulation profile
 Radiological: Urgent US of biliary tract
 ?MRCP
 ERCP + Endoscopic papillotomy +/- stenting
 ? Laparoscopic cholecystectomy later
Critical Care
Bacteraemic shock
 Caused by release of endotoxins
 Vasoactive substances eg, kinins released
 Capillary permeability increased
 Peripheral resistance decreased
 Fever: hyperdynamic circulation
 Treatment: O2; circulatory support; inotropes
Critical Care
The Septic Patient
The term SIRS is used to describe the widely
disseminated inflammatory reaction which can
complicate a wide range of disorders eg,
pancreatitis, trauma, ischaemia.
The term SEPSIS is used in those patients in
whom SIRS is associated with proven infection
Caritical Care
Systemic inflammatory response syndrome
( SIRS )
 Cytokine mediators of SIRS: TNF, IL-1, IL-6, IL- 8
 Secondary inflammation mediators:
- Arachidonic acid metabolites
- Nitric oxide
- Oxygen radicals
- Platelet activating factor
Critical Care
Systemic inflammatory response syndrome
( SIRS )
Systemic changes
 Loss of microvascular integrity
 Increased vascular permeability
 Systemic vasodilatation
 Depressed myocardial contractility
 Poor oxygen delivery
 Increased microvascular clotting
Critical Care
Early features of sepsis
 Fever or hypothermia
 Leucocytosis or leucopenia
 Tachycardia
 Tachypnoea
 Organ dysfunction: Brain - altered mental state
Lungs - hypoxia
Kidneys - oliguria
Critical Care
Nosocomial Infections
(Hospital acquired infections)
( Gk: nosokomeion )
Gk: nosos- of disease; komeo – to nurse
 The patient in the ITU who has some degree of organ dysfunction is
vulnerable to nosocomial infections.
 Good principles of infection control and avoidance of cross-infection
by staff
 Bacteria in the GI tract of the patient is the commonest source
 Nosocomial pneumonia occurs from spillage from the upper GI tract
into the lungs
 H2 receptor antagonists encourages nosocomial infections
 Sucralfate used as stress ulcer prophylaxis is also bacteriostatic
and thus reduces the incidence
Critical Care
A 70 year old patient, ASA anaesthetic category
3, underwent an emergency closure of a
perforated duodenal ulcer. The anaesthetic and
operation were uneventful. On the 1st post-
operative day he complained of feeling very
unwell with a systolic bp of 80 mm hg with no
unusual signs in his abdomen; there was impaired
conscious level and peripheral vasoconstriction.
What will go through your mind and outline your
management.
Critical Care
Cardiogenic shock from myocardial infarction
 Patient already has a drip
 ECG - ST elevation in precordial leads
- Development of new Q waves – wide & / or deep
- T wave inversion
 Pulse oximeter
 Blood for: CK-MB ( creatine kinase, membrane bound )
ALT ( alanine aminotransferase )
AST ( aspartate aminotransferase )
LDH ( lactic dehydrgenase )
Troponin T assay
 Transfer to CCU
Critical Care
Cardiogenic shock from myocardial infarction
CCU management
 CVP
 Consider PAFC
 O2 therapy
 Aspirin
 Nitrates, ACE inhibitors and opiates
 IV beta blockers
 Consider reperfusion strategy
Critical Care
Cardiogenic shock
Complications of MI
 Cardiac arrest ( ventricular fibrillation, VF )
 Pump failure
 Arrhythmias
 Ventricular septal defect ( VSD )
 Cardiac rupture
 Pericardial tamponade
 Ventricular aneurysm
 Mitral regurgitation
MunschC & Shah R in Handbook of Postoperative Complications .Ed Leaper DJ & Peel ALG. 2003, OUP
Critical Care
Cardiogenic shock
 Risk of perioperative MI in the general surgical population = 0.07%
 Risk of MI if surgery is performed within 3 months of MI = 25%
Risk factors
 Previous MI
 Unstable angina
 Disabling angina
 Silent ischaemia
 Hypertension
MunschC & Shah R in Handbook of Postoperative Complications .Ed Leaper DJ & Peel ALG. 2003, OUP
Critical Care
Cardiogenic shock
Definition
Cardiogenic shock indicates a state of inadequate circulatory perfusion
caused by cardiac dysfunction.
Causes
 Mycardial infarction
 Cardiac arrhythmias
 Tension pneumothorax
 Cardiac tamponade
 Vena caval obstruction
 Dissecting aneurysm
Critical Care
Management of a
critically ill
patient is a
medical skill you
must gain it.
Critical Care
Neurogenic and spinal
shock
Critical Care
A fit 30 year old lady while gardening
suddenly became very short of breath, had
intense itching with rash and complained of
a painful red spot on her arm. She has
been brought to the A&E department and is
hypotensive, hypoxic and cold. What is
your diagnosis and how will you manage?
Critical Care
Anaphylactic Shock
 Acute medical emergency
 Follows insect bites, drugs, vaccines, shellfish
 Apprehension, urticaria, bronchospasm, laryngeal oedema,
respiratory distress, hypoxia, massive vasodilatation,
hypotension and shock
 Treatment: Lie patient down, elevate leg, adrenaline, oxygen,
iv hydrocortisone
Critical Care
Anaphylactic Shock
Mechanism
The antigen combines with immunoglobulin (IgE)
on the mast cells and basophils, releasing large
amounts of histamine and SRS-A (slow-release
substance-anaphylaxis). These compounds cause
the symptoms.
Mortality about 10%
Critical Care
A 50 year old man underwent a laparoscopic
closure of a perforated duodenal ulcer. His post-
operative period during the first 4 to 5 days was
uneventful. However, thereafter he did not
progress satisfactorily, had a swinging pyrexia,
hiccoughs, was tachypnoeic, toxic and
complained of pain in the right upper quadrant
and right shoulder tip . What would you suspect
and outline the management.
Critical Care
Intra-abdominal sepsis
Sub-phrenic abscess
Management
 Resuscitation
 Confirmation of diagnosis
 Definitive treatment
Critical Care
Sub-phrenic abscess
Resuscitation
 Oxygen
 Analgesia
 IV fluids
 Antibiotics after blood has been sent for
culture
Critical Care
Sub-phrenic abscess
“Pus somewhere, pus nowhere, pus under the
diaphragm.”
Investigations for confirmation
 Blood: Culture, FBC, CRP
 CXR
 Ultrasound
 ?CT
Critical Care
Sub-phrenic abscess
Treatment
 US or CT guided needle drainage. This may
require more than one attempt because there may
be several loculi of the abscess.
 Open operation – extra-peritoneal approach –
anterior or posterior depending upon the site
Critical Care
How many sub-phrenic spaces are there and what are they?
 7 spaces in all
 4 intra - peritoneal – 2 right and 2 left ( important ones )
 3 extra - peritoneal
 2 right intra-peritoneal – Right anterior ( R subdiaphragmmatic )
Right posterior (R subhepatic or Morison’s hepato-renal pouch)
 2 left intra-peritoneal – Left anterior ( L subdiaphragmmatic )
Left posterior ( L subhepatic or lesser sac or omental bursa )
 3 extra-peritoneal – 2 around the upper pole of each kidney and 1
over bare area of liver
The extra-peritoneal spaces are not clinically important.
Rarely the bare area of the liver may be involved in a liver abscess from amoebic infection.
Critical Care
The Septic Patient
Investigations
 Blood cultures
 U&Es, FBC, CRP, Clotting studies, LFTs
 CXR
 Appropriate imaging studies for source
Critical Care
The Septic Patient
Management
 Supportive measures:
- Oxgenation
- Ventilation if necessary
- IV fluids
- Inotropic support
- Nutritional support
 Specific measures
- Antibiotics
- Drainage
Critical Care
A 70 year old man underwent emergency
operation for a leaking AAA. While in the
ITU, after 2 days, he became oliguric, has
abdominal distension and cardio-
respiratory compromise. His CVP is 10 cm
of water. He is still on the ventilator. What
will you suspect and how will you manage?
Abdominal Compartment Syndrome
This is a condition in which there is a
sustained increase in intra-abdominal
pressure resulting in inadequate ventilation
from type 2 respiratory failure, disturbed
cardiovascular and renal function.
Abdominal Compartment Syndrome
Aetiology
 Trauma : Blunt
Penetrating
 Haemorrhage: Post-operative
Leaking AAA
Abdominal Compartment Syndrome
Aetiology
 Blunt and penetrating abdominal trauma with liver, vascular and
splenic damage
 More likely after abdominal and pelvic trauma
 Risk increases with increase in Injury Severity Score
 Repair of AAA (Emergency or Elective) – 3.8% after repair of
ruptured AAA
 Burns – should be suspected as a cause for renal failure inspite of
adequate fluid resuscitation
Abdominal Compartment Syndrome
Diagnosis
 Patients usually in ICU
 Tense abdomen
 Cardio-respiratory compromise in the absence of
hypovolaemia
 Renal failure
 Round belly sign ( Ratio of AP to transverse
abdominal diameter > 0.80 )
Abdominal Compartment Syndrome
Presentation
 Tense abdomen
 Cardio-respiratory compromise
 Oliguria / Anuria
Abdominal Compartment Syndrome
Pressures
 Measure intra-abdominal pressure (IAP) with a catheter directly into
peritoneal cavity
 Transurethral bladder pressure reflects IAP – most commonly used
 Normal IAP: Men: 3.5 - 10.5 mm hg
Women: 3.0 - 8.8 mm hg
 IAP . 15 – 25 mm hg is diagnostic
Abdominal Compartment Syndrome
Treatment
 Decompression
 Leave abdomen open and cover temporarily with mesh, plastic bag
fascial closure, plastic or silicone sheet or vacuum pack
 Mortality: 63 – 72%
 Ventral hernia: 63%
Critical Care
A 77 year old man underwent a TURP. On
the 2nd post-operative day he is confused,
restless and has some visual disturbance.
What will you suspect and how will you
manage?
Critical Care
Post TURP syndrome
( Dilutional hyponatraemia)
Clinical features
 Restlessness, muscle twitching,
disorientation, visual disturbances, seizures
& collapse
 Hypertension, severe hyponatraemia
Critical Care
Post TURP syndrome
Cause
Occurs following prolonged prostatic resection of
large glands and likely when more than 9 L of
glycine (1.5%) irrigation is used. Large volume of
irrigating fluid enters the vascular space causing
dilutional hyponatraemia resulting in disturbance
of muscle and nerve function.
Critical Care
Post TURP syndrome
Treatment
 Needs ITU monitoring – CVP, serum osmolality,
serum Na
 Supportive
 Frusemide
 Hypertonic saline through CVP line (250-500 mls
of 3 to 5 %) when there are seizures
Caritical Care
Post TURP syndrome
Prevention
 Keep level of irrigating fluid below 20cm above
the operating table
 Stop resection if large veins are opened
 Use irrigating resectoscope
 IV normal saline postoperatively for 12 hours
Critical Care
A 60 year old man underwent a Whipple’s
operation for periampullary carcinoma. On
the 2nd postoperative day, while still in the
ITU, his urinary output has reduced to 300
mls in the previous 12 hours. The catheter
is not blocked. What will you suspect and
how will you manage?
Critical Care
Hepato-renal syndrome
 Can occur following an operation in a patient with
obstructive jaundice
 Reduced GFR – not known why
 Circulating endotoxins - endotoxinaemia
 Absorption of endotoxin produced by the intestinal
microflora
In the jaundiced patient there is a relationship between impaired
renal function and the presence of circulating endotoxins
Cuschieri A, Steele RJC & Moosa AR: Essential Surgical Practice – HST in General Surgery 2002; 401
Critical Care
Hepato-renal syndrome
Prevention
 Adequate hydration and pre-operative induction of diuresis
 For 12 - 24 hours pre-operative 5% dextrose saline iv
 Mannitol (osmotic diuretic) or Frusemide (loop diuretic) iv at
anaesthetic induction
 Catheterise - hourly urine output
 Further diuretics if urine output < 40ml/hr in peri-operative and post-
operative period
 Pre-operative oral chenodeoxycholate and oral lactulose for a few
days – controversial
Cuschieri A, Steele RJC & Moosa AR: Essential Surgical Practice – HST in General Surgery 2002; 401
Critical Care
Hepato-renal syndrome
Treatment
 Treat hyperkalaemia
 Peritoneal dialysis
 Hemofiltration
 Haemodialysis
Critical Care
Renal failure
Treatment of hyperkalaemia
 10 to 20 mls of10% Ca gluconate or chloride iv : stabilises the
myocardial membrane
 50 mls of 50% dextrose + 10 units of soluble insulin: drives
potassium into cells
 200 to 300 mls of 1.4% sodium bicarbonate iv: drives potassium
into cells and corrects acidosis; beware of fluid overload in ARF
 Calcium resonium 15 g tds orally or rectally: binds potassium and
releases Ca in exchange
 Renal replacement therapy
Critical Care
Renal failure
Predisposing causes
 Preoperative renal impairment
 Surgery associated with major blood loss and fluid shifts
 Hypovolaemia
 Hypotension
 Sepsis
 Nephrotoxic drugs
Critical Care
A 60 year old man underwent a successful
embolectomy of his leg. The next day he
developed severe throbbing pain in the leg
which on examination did not look
ischaemic and was warm to touch. What
would you suspect and how would you
manage the condition?
Critical Care
Acute limb compartment syndrome
What are the causes of this condition?
How do you diagnose it?
How do you treat the condition?
Acute Limb Compartment Syndromea
This is a condition in which raised pressure
within a closed fascial space reduces
capillary perfusion below a level necessary
for tissue viability.
Acute Limb Compartment Syndrome
Aetiology
 Orthopaedic
 Vascular
 Iatrogenic
 Soft tissue injury
Tiwari A, Haq A I, Myint F, Hamilton G: Acute compartment syndromes: Br J Surg (April) 2002, 89, 397 - 412
Acute Limb Compartment Syndrome
Presentation
 Pain – severe and out of proportion to the apparent injury
 Pain on passive movement
 Swollen and tense compartment
 Progression of the above over a short time period
 Paraesthesia – especially loss of two point discrimination
 Pallor and pulselessness – usually with a vascular injury
 Paralysis – late symptom
Acute Limb Compartment Syndrome
Pressures
 Normal resting: 0 - 8 mm hg
 Pain and paraesthesia: 20 – 30 mm hg
 Fasciotomy: > 30 mm hg
 If pressure of > 30 mm hg is present for 6 – 8 hours irreversible damage occurs
Acute Limb Compartment Syndrome
Treatment
Fasciotomy
 Forearm: Volar and dorsal compartment
 Hand: Carpal tunnel decompression
 Thigh: 3 compartments – anterior, posterior, medial
 Leg: 4 compartments – anterior, lateral,deep and superficial
posterior
Critical Care
Pain relief
Post-operative
Intractable pain
Critical Care
Pain relief
Post-operative pain
 Diclofenac suppositories
 LA to incision site
 IV narcotic drugs
 Regional analgesia eg, caudal block, intercostal block
 Continuous epidural analgesia
 Continuous IV opiate analgesia
 PCA by IV or epidural opioid analgesia
Critical Care
Drugs for treatment of post-operative pain
 Simple analgesics: Paracetamol, Aspirin
 NSAIDs
 Intermediate drugs: Tramadol, Co-dydramol
 Opioids: Morphine, Diamorphine
 Local anaesthetics: Lignocaine, Bupivacaine
Critical Care
Pain relief
Intractable pain
‘As doctors we are there to cure sometimes, to relieve often and to comfort always’ Sir James Calnan
Intractable pain is defined as chronic and
continuous pain where the cause cannot be
removed or the origin cannot be determined.
Causes: Benign
Malignant
Critical Care
Relief of Benign Intractable Pain
 LA + / - steroid injections
 Nerve stimulation procedures
 Nerve decompression
 Sympathectomy
Critical Care
Relief of Malignant Intractable Pain
Neurolytic techniques
 Subcostal phenol
injection
 Coeliac plexus block –
alcohol
 Intrathecal phenol
 Percutaneous
anterolateral cordotomy
Miscellaneous methods
 Injection of opiate:
- subcutaneous
- intravenous
- intrathecal
- epidural
 Hormone analogues
 Radiotherapy
 Steroids
Nutrition
Clinical indications for nutritional support
 Preoperative malnutrition
 Postoperative complications: ileus > 4 days, sepsis, fistula
 Intestinal fistulae
 Massive bowel resection
 Severe acute pancreatitis
 Inflammatory bowel disease
 Maxillofacial trauma
 Multiple trauma
 Burns
 Malignant disease
 Renal failure
 Coma
Nutrition
Assessment
 Body weight
 Upper arm circumference : < 23cm in females, < 25 cm in
males
 Triceps skinfold thickness : < 13 mm in females, < 10 mm in
males
 Serum albumin : < 35 g / l
 Lymphocyte count : < 1500 / c mm
 Candida skin test : -ve reaction indicates defective immunity
 Nitrogen balance studies
Goode A W : Nutritional support and rehabilitation in Bailey and Love, 23rd Ed, 2000
Nutrition
Requirements
 Carbohydrate
 Fat
 Protein
 Vitamins
 Minerals
 Trace elements
Nutrition
A healthy adult at rest requires 6300 – 8400
nonprotein kilojoules per day for energy
( 1500 – 2000 calories).
Goode A W : Nutritional support and rehabilitation in Bailey and Love 23rd Ed, 2000
Nutrition
In Burns
 Give 25 kcl/kg body weight + 40 kcl / % body
surface area burnt in the adult
 The child needs more calories / kg body weight
 The infant needs 90 – 100 kcl / kg
Cuschieri A, Steele R J , Moosa A R : Management of the burns victim in Essential Surgical Practice,
Basic Surgical Training, 4th Ed. 2001, p 116
Nutrition
Requirements
 Carbohydrate provides 16.8 kJ/g (4.1 kcal/g)
 Fat provides 37.8 kJ/g (9.1 kcal/g)
The number of nonprotein kilojoules given should bear a definite
relationship to the nitrogen intake. A typical regime would feature
8400 kJ (2000 kcal) to 13 g nitrogen ( about 150 to 1 ).
Goode A W : Nutritional support and rehabilitation in Bailey and Love, 23rd Ed 2000
Nutrition
Nitrogen requirements
A healthy adult in positive nitrogen balance
needs 35-40 g of protein or 5.5 -6.5g of
nitrogen a day.The hypercatabolic patient
requiring hyperalimentation may need 3 to
4 times this amount of protein.
Goode A W: Nutritional support and rehabilitation in Bailey & Love 23rd ed
2000
Nutrition
Methods of feeding
Enteral
 Oral
 Nasogastric tube
 Gastrostomy : Stamm temporary
Janeway permanent
PEG
 Jejunostomy
Nutrition
Complications of enteral nutrition
 Nutritional and metabolic
 Complications of nutrient delivery
 Gastrointestinal complications
Cuscgeri A, Steele R J C & Moosa A R :Enteral nutrition in Essential Surgical Practice, 4th Ed 2001
Nutrition
Methods of feeding
Parenteral
 Used in < 4 – 5% of all hospital admissions
 Used when enteral feeding is not possible or to
supplement enteral feeding
 Indications: Short term
Long term ( HPN )
Nutrition
Complications of parenteral nutrition
 Catheter related
 Nutritional and metabolic
 Effect on other organ systems
Cuscheri A, Steele R J C and Moosa A R : Parenteral nutrition in Essential Surgical Practice, 4th Ed. 2001
Nutrition
Complications of parenteral nutrition
Catheter related
 Infection
 Thrombosis
 Occlusion
 Fracture
Cuscheri A, Steele R J C& Moosa A R : Parenteral nutrition in Essential Surgical Practice, 4th Ed
2001
Nutrition
Complications of parenteral nutrition
Nutritional and metabolic
 Fluid overload
 Hyperglycaemia
 Electrolyte imbalance
 Micronutrient deficiencies eg selenium in long-term patients
Cuscheri A, Steele & Moosa A R: Parenteral nutrition in Essential Surgical Practice, 4th Ed 2001
Nutrition
Complications of parenteral nutrition
Effect on other organ systems
 Hepatobiliary system – biliary sludge, hepatic steatosis,
cholestasis
 The immune system
 Skeleton – metabolic bone disease
Cuscheri A, Steele JR J C & Moosa A R : Parenteral nutrition in Essential Surgical Practice, 4thEd 2001
Nutrition
Monitoring feeding regimens in parenteral nutrition
Daily
 Body weight
 Fluid balance
 FBC, U&E
 Blood glucose
 Urine and plasma osmolality
 Electrolyte and nitrogen analysis of urine and gastrointestinal losses
 Acid-base status
Goode A W : Nutritional support and rehabilitation in Bailey and Love 23rd Ed, 2000
Nutrition
Monitoring feeding regimens in parenteral nutrition
Every 10 days
 Serum B12, Folate, Iron, lactate and triglycerides
 Trace elements
Goode A W: Nutritional support and rehabilitation in Bailey & Love 23rd Ed, 2000
Nutrition
Monitoring feeding regimens in parenteral nutrition
Three times weekly
 Serum Calcium, magnesium and phosphate
 Plasma proteins
 LFTs
 Clotting studies
Goode A W : Nutritional support and rehabilitation in Bailey & Love, 23rd Ed 2000
Nutrition
“Imprisoned in every fat man, a thin
one is wildly signalling to be let out”
- Cyril Connolly (1903 – 1974)
THE END

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Critical care

  • 2. Critical Care Patients needing ITU care Emergency  Multiple trauma (including burns)  Leaking AAA  Severe acute pancreatitis  Post-operative complications: - Surgical - Cardiac - Respiratory - Renal  Severe spesis Elective  Major vascular eg, AAA  Oesophagectomy  Cardiac operations  Major procedures - Whipple’s - Patients in ASA 2 category or more
  • 3. Critical Care Indications for ICU transfer  Potential incipient or actual organ failure in a remediable condition  Advanced monitoring of organ function  Treatment of organ failure: Heart – use of inotropes Lungs – ventilation Kidneys – renal replacement therapy  A need for 1:1 nursing
  • 4. Critical Care Tools for critical care Respiratory  Pulse oximetry - O2 saturation of arterial blood  Capnography - CO2 tension in expired gas Cardiovascular  Arterial lines  CVP  Pulmonary artery flotation catheter (PAFC)  Cardiac output measurement
  • 5. Critical Care Pulse oximetry  95% - 100% = normal  93% =Warning!  < 90% = patient is in severe trouble
  • 6. Critical Care Pulse oximetry  Gives estimate of percentage saturation of oxygen binding sites  Related to Pa02 by oxygen dissociation curve
  • 7. Capnography  Infra-red absorption through gas stream  Relies on rapid equilibration of CO2 between alveolus and pulmonary capillary  Useful guide to PaCO2 but beware of lung disease  Continuous measurement Critical Care
  • 8. Critical Care Arterial line Indications  Continuous BP measurement  Access for serial arterial blood gas analysis Complications  Bleeding  Thrombosis  Infection  Pseudoaneurysm  Accidental drug injection Site the line in the radial artery of the non-dominant hand. Allen’s test should be performed.
  • 9. Critical Care Arterial Line Allen’s test The fist is tightly clenched, both wrist pulses are tightly obstructed and the fist then released. Pressure is released from the ulnar artery first. Allen’s test is positive when the medial part of the hand remains blanched.
  • 10. Critical Care Central venous catheterisation Indications  Invasive monitoring for estimation of fluid status and right heart function  Long term infusions: TPN, chemotherapy  Haemodialysis  Lack of peripheral venous access  Access for pulmonary artery catheterisation
  • 11. Critical Care Central venous catheterisation Complications  Inadvertent - arterial puncture - thoracic duct puncture - lung puncture  Air embolus  Catheter-related sepsis  Clot formation  Malposition and rupture of vein
  • 12. Critical Care Pulmonary artery wedge pressure (PWAP) It is an accurate representation of the left atrial pressure which closely parallels the left ventricular end-diastolic pressure thus helping to guide fluid therapy.
  • 13. Critical Care Pulmonary artery wedge pressure Introduced in 1970s by two cardiologists, Drs Swan and Ganz. Used to measure:  Pressure within the pulmonary artery  Pulmonary artery wedge pressure  Cardiac output by thermodilution or dye dilution method  Sampling of mixed venous blood
  • 14. Critical Care Pulmonary artery catheterisation Indications  Complex operations in patients with complex cardiopulmonary disease  Multisystem failure  Major trauma  Sepsis  Situations where accurate haemodynamic status needs to be ascertained
  • 15. Critical Care Pulmonary artery wedge pressure Complications  Valvular damage  Ventricular rupture  Pulmonary artery rupture  Aneurysm or infarction  Those of central venous catheterisation
  • 16. Critical Care Standard values  Central venous pressure (CVP): 0-6 mm Hg  Right ventricular pressure: 25 mm Hg  Pulmonary artery pressure (PAP): 25 mm Hg  Wedge pressure (PAWP): 6-12 mm Hg  Cardiac index (CI): >2.8-3.6 L / min / m2  Systemic vascular resistance(SVR):770-1500 dynes / sec / cm2  Oxygen delivery: 600ml / min / m2  Oxygen consumption: 150 mls / min / m2
  • 17. Critical Care A 60 year old man had a right hemicolectomy. On the 1st postoperative day he has developed a temperature of 390 C, is very short of breath and looks slightly cyanosed; his oxygen saturation is 92%. What will you suspect and how will you manage the condition?
  • 18. Critical Care Postoperative pulmonary collapse Although atelectasis and collapse are often used synonymously, atelectasis strictly speaking refers to lung parenchyma that has never been expanded.
  • 19. Critical Care Postoperative pulmonary collapse Clinical features  Tachypnoea  Pyrexia  Productive cough  Cyanosis  Dullness on percussion  Bronchial breathing
  • 20. Critical Care Postoperative pulmonary collapse Management  Antibiotic – amoxycillin  O2 therapy with inspired O2 concentration of 30-40% with humidification  Vigorous physiotherapy + / - iv Doxapram  Urgent fibreoptic bronchoscopy  Minitracheostomy Continue with physiotherapy and monitor with blood gases and pulse oximetry- aim for oxygen tension to be no less than 10kPa
  • 21. Critical Care Postoperative pulmonary collapse This arises from reduced ventilation of the lung bases resulting in accumulation of bronchial secretions. This may be basal, segmental, lobar or complete lung collapse. The degree of hypoxia depends upon the extent of collapse. Infection with consolidation supervenes with the organisms being Haemophilus influenza, streptococcus pneumoniae, coliform, MRSA and pseudomonas.
  • 22. Critical Care Post-operative hypoxia Surgical patients at risk of hypoxia  Smokers  Chronic pulmonary disease  Elderly  Obesity  Pre-operative opiates and sedatives  Abdominal emergency surgery  Orthopaedic surgery (fat emboli)
  • 23. Critical Care Effects of post-operative hypoxia  Central nervous system - Obtunded pain sensation - Post-operative confusion  Cardiovascular system - Tachycardia - Myocardial ischaemia  Respiratory system - Hypercapnoea (airway obstruction) - Respiratory muscle failure  Renal - Renal failure
  • 24. Critical Care Effects of post-operative hypoxia (contd)  Gastrointestinal - Ulceration - Reduced immunoprotection  Hepatic - Ischaemic necrosis of hepatocytes  Haematological - Reduced platelet function - Coagulation problems  Wound healing - Impaired wound healing
  • 25. Critical Care Respiratory failure Respiratory failure is defined as an arterial oxygen tension (PaO2) at sea level of less than 8 kPa, i.e. hypoxia due inadequate gas exchange within the lung.
  • 26. Critical Care Respiratory Failure Type I Hypoxia Failed O2 uptake PaO2 <8kPa (Hypoxia) + Normal PaCO2 (7kPa) or low
  • 27. Critical Care Respiratory Failure Type II Hypoxia + Hypercapnia Failed O2 uptake + Failed CO2 removal PaO2 < 8kPa + PaCO2 > 7kPa
  • 28. Critical Care A 65 year old lady had a hip replacement 10 days ago. She is ready to be discharged. She went to the toilet just prior to leaving the ward for home. She collapsed in the toilet. What is your diagnosis and management?
  • 29. Critical Care Pulmonary embolus Clinical diagnosis  Dyspnoea  Tachypnoea  Pleuritic chest pain  Small haemoptysis  Calf tenderness and swelling
  • 30. Critical Care Pulmonary embolus Management  Resuscitation  Investigations  Treatment
  • 31. Critical Care Pulmonary embolus Management  The stable patient  The unstable patient
  • 32. Critical Care Pulmonary embolus Investigations The stable patient  ECG & CXR; blood gases  VQ scan  Duplex Doppler u/s of leg veins  Pulmonary angiogram  Contrast venography & plethysmography
  • 33. Critical Care Pulmonary embolus Investigations The unstable patient  Echocardiogram  Pulmonary angiogram  Spiral CT – very sensitive
  • 34. Critical Care Pulmonary embolus Treatment  Anticoagulation  Emergency embolectomy  IVC filters  Thrombolysis – in haemodynamically unstable patient with refractory shock - Intravenous - Pulse spray directly into embolus
  • 35. Indications for insertion of IVC filter Therapeutic  Recurrent PE despite effective anticoagulation  Anticoagulation is contraindicated  Post pulmonary embolectomy to prevent recurrence  Pulmonary hypertension from chronic recurrent PE  Extensive PE  Iliofemoral DVT propagation despite adequate anticoagulation  Free-floating IVC thrombus  Bilateral free-floating DVT Prophylactic  Venous thrombolysis ( 20% develop PE )  Hip and knee replacement ( controversial )  Multiple trauma ( controversial )
  • 36. Critical Care Shock Definition Shock is a clinical state and is defined as inadequate tissue oxygenation which leads to impairment of cellular function.
  • 37. Critical Care Shock Clinical features  Hypotension  Tachycardia  Tachypnoea  Cold, clammy extremities  Sweating
  • 38. Critical Care Shock Types  Hypovolaemic  Septicaemic  Cardiogenic  Neurogenic  Anaphylactic
  • 39. Critical Care A 60 year old patient of ASA 1 anaesthetic risk underwent a total gastrectomy for cancer stomach. While in the ITU, 12 hours postoperatively, his BP has fallen to 80 mm hg systolic, has not put out any urine over the last 3 hours and is hypoxic with O2 saturation of 92%. What will you suspect and how will you manage?
  • 40. Critical Care Answer Post-operative hypotension from bleeding Q. Where would the bleeding come from? Slipped left gastric artery ligature Q. Where does the left gastric artery arise from? The coeliac axis
  • 41. Critical Care Post-operative hypotension Investigations  Monitor BP  Continuous ECG, pulse oximetry  Monitor urine output  Monitor core and peripheral temperature  Blood samples: U&Es,FBC, Cross match Coagulation screen
  • 42. Critical Care Post-operative hypotension Management  ABC  Oxygen  Raise legs  IV Fluids  CVP line – particularly in over 60 years  Control bleeding – re-exploration
  • 43. Critical Care Hypotension One of the commonest post-operative complications Definition Systolic BP < 90 mm hg or Reduction from usual BP of > 30%
  • 44. Critical Care Hypotension Causes  Inadequate pre-load  Decreased contractility
  • 45. Critical Care Causes of inadequate pre-load in hypotension Absolute reduction of fluid  Blood loss (obvious or occult)  Dehydration with inadequate fluid replacement Relative reduction of fluid  Venodilatation  Mechanical interference - tension pneumothorax - pulmonary embolism - tachycardia - arrythmia
  • 46. Critical Care Causes of decreased contractility in hypotension Toxic  Ischaemic  Hypoxic  Acidosis  Drugs  Electrolyte disturbance  Sepsis  Jaundice Mechanical  Fluid overload  Cardiac tamponade
  • 47. Critical Care A 60 year old woman has been admitted as an emergency with a 4 day history of severe right upper quadrant pain, vomiting, jaundice and intense pruritis and is very toxic – high temperature with rigors and hyperdynamic circulation. What will you suspect and outline the management.
  • 48. Critical Care Septic shock from acute calculous biliary obstruction +/- Acute pancreatitis Management  Resuscitation  Confirmation of diagnosis  Definitive treatment
  • 49. Critical Care Acute calculous biliary obstruction + Septic shock +/- Acute pancreatitis Resuscitation  Analgesia  IV Dextrose; Mannitol; Antibiotics after blood culture  Urinary catheter  CVP line
  • 50. Critical Care Acute calculous biliary obstruction Investigations & definitive treatment  Blood: Culture, U&Es, FBC, CRP, LFTs, Serum amylase, Coagulation profile  Radiological: Urgent US of biliary tract  ?MRCP  ERCP + Endoscopic papillotomy +/- stenting  ? Laparoscopic cholecystectomy later
  • 51. Critical Care Bacteraemic shock  Caused by release of endotoxins  Vasoactive substances eg, kinins released  Capillary permeability increased  Peripheral resistance decreased  Fever: hyperdynamic circulation  Treatment: O2; circulatory support; inotropes
  • 52. Critical Care The Septic Patient The term SIRS is used to describe the widely disseminated inflammatory reaction which can complicate a wide range of disorders eg, pancreatitis, trauma, ischaemia. The term SEPSIS is used in those patients in whom SIRS is associated with proven infection
  • 53. Caritical Care Systemic inflammatory response syndrome ( SIRS )  Cytokine mediators of SIRS: TNF, IL-1, IL-6, IL- 8  Secondary inflammation mediators: - Arachidonic acid metabolites - Nitric oxide - Oxygen radicals - Platelet activating factor
  • 54. Critical Care Systemic inflammatory response syndrome ( SIRS ) Systemic changes  Loss of microvascular integrity  Increased vascular permeability  Systemic vasodilatation  Depressed myocardial contractility  Poor oxygen delivery  Increased microvascular clotting
  • 55. Critical Care Early features of sepsis  Fever or hypothermia  Leucocytosis or leucopenia  Tachycardia  Tachypnoea  Organ dysfunction: Brain - altered mental state Lungs - hypoxia Kidneys - oliguria
  • 56. Critical Care Nosocomial Infections (Hospital acquired infections) ( Gk: nosokomeion ) Gk: nosos- of disease; komeo – to nurse  The patient in the ITU who has some degree of organ dysfunction is vulnerable to nosocomial infections.  Good principles of infection control and avoidance of cross-infection by staff  Bacteria in the GI tract of the patient is the commonest source  Nosocomial pneumonia occurs from spillage from the upper GI tract into the lungs  H2 receptor antagonists encourages nosocomial infections  Sucralfate used as stress ulcer prophylaxis is also bacteriostatic and thus reduces the incidence
  • 57. Critical Care A 70 year old patient, ASA anaesthetic category 3, underwent an emergency closure of a perforated duodenal ulcer. The anaesthetic and operation were uneventful. On the 1st post- operative day he complained of feeling very unwell with a systolic bp of 80 mm hg with no unusual signs in his abdomen; there was impaired conscious level and peripheral vasoconstriction. What will go through your mind and outline your management.
  • 58. Critical Care Cardiogenic shock from myocardial infarction  Patient already has a drip  ECG - ST elevation in precordial leads - Development of new Q waves – wide & / or deep - T wave inversion  Pulse oximeter  Blood for: CK-MB ( creatine kinase, membrane bound ) ALT ( alanine aminotransferase ) AST ( aspartate aminotransferase ) LDH ( lactic dehydrgenase ) Troponin T assay  Transfer to CCU
  • 59. Critical Care Cardiogenic shock from myocardial infarction CCU management  CVP  Consider PAFC  O2 therapy  Aspirin  Nitrates, ACE inhibitors and opiates  IV beta blockers  Consider reperfusion strategy
  • 60. Critical Care Cardiogenic shock Complications of MI  Cardiac arrest ( ventricular fibrillation, VF )  Pump failure  Arrhythmias  Ventricular septal defect ( VSD )  Cardiac rupture  Pericardial tamponade  Ventricular aneurysm  Mitral regurgitation MunschC & Shah R in Handbook of Postoperative Complications .Ed Leaper DJ & Peel ALG. 2003, OUP
  • 61. Critical Care Cardiogenic shock  Risk of perioperative MI in the general surgical population = 0.07%  Risk of MI if surgery is performed within 3 months of MI = 25% Risk factors  Previous MI  Unstable angina  Disabling angina  Silent ischaemia  Hypertension MunschC & Shah R in Handbook of Postoperative Complications .Ed Leaper DJ & Peel ALG. 2003, OUP
  • 62. Critical Care Cardiogenic shock Definition Cardiogenic shock indicates a state of inadequate circulatory perfusion caused by cardiac dysfunction. Causes  Mycardial infarction  Cardiac arrhythmias  Tension pneumothorax  Cardiac tamponade  Vena caval obstruction  Dissecting aneurysm
  • 63. Critical Care Management of a critically ill patient is a medical skill you must gain it.
  • 65. Critical Care A fit 30 year old lady while gardening suddenly became very short of breath, had intense itching with rash and complained of a painful red spot on her arm. She has been brought to the A&E department and is hypotensive, hypoxic and cold. What is your diagnosis and how will you manage?
  • 66. Critical Care Anaphylactic Shock  Acute medical emergency  Follows insect bites, drugs, vaccines, shellfish  Apprehension, urticaria, bronchospasm, laryngeal oedema, respiratory distress, hypoxia, massive vasodilatation, hypotension and shock  Treatment: Lie patient down, elevate leg, adrenaline, oxygen, iv hydrocortisone
  • 67. Critical Care Anaphylactic Shock Mechanism The antigen combines with immunoglobulin (IgE) on the mast cells and basophils, releasing large amounts of histamine and SRS-A (slow-release substance-anaphylaxis). These compounds cause the symptoms. Mortality about 10%
  • 68. Critical Care A 50 year old man underwent a laparoscopic closure of a perforated duodenal ulcer. His post- operative period during the first 4 to 5 days was uneventful. However, thereafter he did not progress satisfactorily, had a swinging pyrexia, hiccoughs, was tachypnoeic, toxic and complained of pain in the right upper quadrant and right shoulder tip . What would you suspect and outline the management.
  • 69. Critical Care Intra-abdominal sepsis Sub-phrenic abscess Management  Resuscitation  Confirmation of diagnosis  Definitive treatment
  • 70. Critical Care Sub-phrenic abscess Resuscitation  Oxygen  Analgesia  IV fluids  Antibiotics after blood has been sent for culture
  • 71. Critical Care Sub-phrenic abscess “Pus somewhere, pus nowhere, pus under the diaphragm.” Investigations for confirmation  Blood: Culture, FBC, CRP  CXR  Ultrasound  ?CT
  • 72. Critical Care Sub-phrenic abscess Treatment  US or CT guided needle drainage. This may require more than one attempt because there may be several loculi of the abscess.  Open operation – extra-peritoneal approach – anterior or posterior depending upon the site
  • 73. Critical Care How many sub-phrenic spaces are there and what are they?  7 spaces in all  4 intra - peritoneal – 2 right and 2 left ( important ones )  3 extra - peritoneal  2 right intra-peritoneal – Right anterior ( R subdiaphragmmatic ) Right posterior (R subhepatic or Morison’s hepato-renal pouch)  2 left intra-peritoneal – Left anterior ( L subdiaphragmmatic ) Left posterior ( L subhepatic or lesser sac or omental bursa )  3 extra-peritoneal – 2 around the upper pole of each kidney and 1 over bare area of liver The extra-peritoneal spaces are not clinically important. Rarely the bare area of the liver may be involved in a liver abscess from amoebic infection.
  • 74. Critical Care The Septic Patient Investigations  Blood cultures  U&Es, FBC, CRP, Clotting studies, LFTs  CXR  Appropriate imaging studies for source
  • 75. Critical Care The Septic Patient Management  Supportive measures: - Oxgenation - Ventilation if necessary - IV fluids - Inotropic support - Nutritional support  Specific measures - Antibiotics - Drainage
  • 76. Critical Care A 70 year old man underwent emergency operation for a leaking AAA. While in the ITU, after 2 days, he became oliguric, has abdominal distension and cardio- respiratory compromise. His CVP is 10 cm of water. He is still on the ventilator. What will you suspect and how will you manage?
  • 77. Abdominal Compartment Syndrome This is a condition in which there is a sustained increase in intra-abdominal pressure resulting in inadequate ventilation from type 2 respiratory failure, disturbed cardiovascular and renal function.
  • 78. Abdominal Compartment Syndrome Aetiology  Trauma : Blunt Penetrating  Haemorrhage: Post-operative Leaking AAA
  • 79. Abdominal Compartment Syndrome Aetiology  Blunt and penetrating abdominal trauma with liver, vascular and splenic damage  More likely after abdominal and pelvic trauma  Risk increases with increase in Injury Severity Score  Repair of AAA (Emergency or Elective) – 3.8% after repair of ruptured AAA  Burns – should be suspected as a cause for renal failure inspite of adequate fluid resuscitation
  • 80. Abdominal Compartment Syndrome Diagnosis  Patients usually in ICU  Tense abdomen  Cardio-respiratory compromise in the absence of hypovolaemia  Renal failure  Round belly sign ( Ratio of AP to transverse abdominal diameter > 0.80 )
  • 81. Abdominal Compartment Syndrome Presentation  Tense abdomen  Cardio-respiratory compromise  Oliguria / Anuria
  • 82. Abdominal Compartment Syndrome Pressures  Measure intra-abdominal pressure (IAP) with a catheter directly into peritoneal cavity  Transurethral bladder pressure reflects IAP – most commonly used  Normal IAP: Men: 3.5 - 10.5 mm hg Women: 3.0 - 8.8 mm hg  IAP . 15 – 25 mm hg is diagnostic
  • 83. Abdominal Compartment Syndrome Treatment  Decompression  Leave abdomen open and cover temporarily with mesh, plastic bag fascial closure, plastic or silicone sheet or vacuum pack  Mortality: 63 – 72%  Ventral hernia: 63%
  • 84.
  • 85. Critical Care A 77 year old man underwent a TURP. On the 2nd post-operative day he is confused, restless and has some visual disturbance. What will you suspect and how will you manage?
  • 86. Critical Care Post TURP syndrome ( Dilutional hyponatraemia) Clinical features  Restlessness, muscle twitching, disorientation, visual disturbances, seizures & collapse  Hypertension, severe hyponatraemia
  • 87. Critical Care Post TURP syndrome Cause Occurs following prolonged prostatic resection of large glands and likely when more than 9 L of glycine (1.5%) irrigation is used. Large volume of irrigating fluid enters the vascular space causing dilutional hyponatraemia resulting in disturbance of muscle and nerve function.
  • 88. Critical Care Post TURP syndrome Treatment  Needs ITU monitoring – CVP, serum osmolality, serum Na  Supportive  Frusemide  Hypertonic saline through CVP line (250-500 mls of 3 to 5 %) when there are seizures
  • 89. Caritical Care Post TURP syndrome Prevention  Keep level of irrigating fluid below 20cm above the operating table  Stop resection if large veins are opened  Use irrigating resectoscope  IV normal saline postoperatively for 12 hours
  • 90. Critical Care A 60 year old man underwent a Whipple’s operation for periampullary carcinoma. On the 2nd postoperative day, while still in the ITU, his urinary output has reduced to 300 mls in the previous 12 hours. The catheter is not blocked. What will you suspect and how will you manage?
  • 91. Critical Care Hepato-renal syndrome  Can occur following an operation in a patient with obstructive jaundice  Reduced GFR – not known why  Circulating endotoxins - endotoxinaemia  Absorption of endotoxin produced by the intestinal microflora In the jaundiced patient there is a relationship between impaired renal function and the presence of circulating endotoxins Cuschieri A, Steele RJC & Moosa AR: Essential Surgical Practice – HST in General Surgery 2002; 401
  • 92. Critical Care Hepato-renal syndrome Prevention  Adequate hydration and pre-operative induction of diuresis  For 12 - 24 hours pre-operative 5% dextrose saline iv  Mannitol (osmotic diuretic) or Frusemide (loop diuretic) iv at anaesthetic induction  Catheterise - hourly urine output  Further diuretics if urine output < 40ml/hr in peri-operative and post- operative period  Pre-operative oral chenodeoxycholate and oral lactulose for a few days – controversial Cuschieri A, Steele RJC & Moosa AR: Essential Surgical Practice – HST in General Surgery 2002; 401
  • 93. Critical Care Hepato-renal syndrome Treatment  Treat hyperkalaemia  Peritoneal dialysis  Hemofiltration  Haemodialysis
  • 94. Critical Care Renal failure Treatment of hyperkalaemia  10 to 20 mls of10% Ca gluconate or chloride iv : stabilises the myocardial membrane  50 mls of 50% dextrose + 10 units of soluble insulin: drives potassium into cells  200 to 300 mls of 1.4% sodium bicarbonate iv: drives potassium into cells and corrects acidosis; beware of fluid overload in ARF  Calcium resonium 15 g tds orally or rectally: binds potassium and releases Ca in exchange  Renal replacement therapy
  • 95. Critical Care Renal failure Predisposing causes  Preoperative renal impairment  Surgery associated with major blood loss and fluid shifts  Hypovolaemia  Hypotension  Sepsis  Nephrotoxic drugs
  • 96.
  • 97.
  • 98. Critical Care A 60 year old man underwent a successful embolectomy of his leg. The next day he developed severe throbbing pain in the leg which on examination did not look ischaemic and was warm to touch. What would you suspect and how would you manage the condition?
  • 99. Critical Care Acute limb compartment syndrome What are the causes of this condition? How do you diagnose it? How do you treat the condition?
  • 100. Acute Limb Compartment Syndromea This is a condition in which raised pressure within a closed fascial space reduces capillary perfusion below a level necessary for tissue viability.
  • 101. Acute Limb Compartment Syndrome Aetiology  Orthopaedic  Vascular  Iatrogenic  Soft tissue injury Tiwari A, Haq A I, Myint F, Hamilton G: Acute compartment syndromes: Br J Surg (April) 2002, 89, 397 - 412
  • 102.
  • 103. Acute Limb Compartment Syndrome Presentation  Pain – severe and out of proportion to the apparent injury  Pain on passive movement  Swollen and tense compartment  Progression of the above over a short time period  Paraesthesia – especially loss of two point discrimination  Pallor and pulselessness – usually with a vascular injury  Paralysis – late symptom
  • 104. Acute Limb Compartment Syndrome Pressures  Normal resting: 0 - 8 mm hg  Pain and paraesthesia: 20 – 30 mm hg  Fasciotomy: > 30 mm hg  If pressure of > 30 mm hg is present for 6 – 8 hours irreversible damage occurs
  • 105.
  • 106. Acute Limb Compartment Syndrome Treatment Fasciotomy  Forearm: Volar and dorsal compartment  Hand: Carpal tunnel decompression  Thigh: 3 compartments – anterior, posterior, medial  Leg: 4 compartments – anterior, lateral,deep and superficial posterior
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  • 108.
  • 110. Critical Care Pain relief Post-operative pain  Diclofenac suppositories  LA to incision site  IV narcotic drugs  Regional analgesia eg, caudal block, intercostal block  Continuous epidural analgesia  Continuous IV opiate analgesia  PCA by IV or epidural opioid analgesia
  • 111. Critical Care Drugs for treatment of post-operative pain  Simple analgesics: Paracetamol, Aspirin  NSAIDs  Intermediate drugs: Tramadol, Co-dydramol  Opioids: Morphine, Diamorphine  Local anaesthetics: Lignocaine, Bupivacaine
  • 112. Critical Care Pain relief Intractable pain ‘As doctors we are there to cure sometimes, to relieve often and to comfort always’ Sir James Calnan Intractable pain is defined as chronic and continuous pain where the cause cannot be removed or the origin cannot be determined. Causes: Benign Malignant
  • 113. Critical Care Relief of Benign Intractable Pain  LA + / - steroid injections  Nerve stimulation procedures  Nerve decompression  Sympathectomy
  • 114. Critical Care Relief of Malignant Intractable Pain Neurolytic techniques  Subcostal phenol injection  Coeliac plexus block – alcohol  Intrathecal phenol  Percutaneous anterolateral cordotomy Miscellaneous methods  Injection of opiate: - subcutaneous - intravenous - intrathecal - epidural  Hormone analogues  Radiotherapy  Steroids
  • 115.
  • 116.
  • 117.
  • 118.
  • 119.
  • 120.
  • 121.
  • 122.
  • 123.
  • 124. Nutrition Clinical indications for nutritional support  Preoperative malnutrition  Postoperative complications: ileus > 4 days, sepsis, fistula  Intestinal fistulae  Massive bowel resection  Severe acute pancreatitis  Inflammatory bowel disease  Maxillofacial trauma  Multiple trauma  Burns  Malignant disease  Renal failure  Coma
  • 125. Nutrition Assessment  Body weight  Upper arm circumference : < 23cm in females, < 25 cm in males  Triceps skinfold thickness : < 13 mm in females, < 10 mm in males  Serum albumin : < 35 g / l  Lymphocyte count : < 1500 / c mm  Candida skin test : -ve reaction indicates defective immunity  Nitrogen balance studies Goode A W : Nutritional support and rehabilitation in Bailey and Love, 23rd Ed, 2000
  • 126. Nutrition Requirements  Carbohydrate  Fat  Protein  Vitamins  Minerals  Trace elements
  • 127. Nutrition A healthy adult at rest requires 6300 – 8400 nonprotein kilojoules per day for energy ( 1500 – 2000 calories). Goode A W : Nutritional support and rehabilitation in Bailey and Love 23rd Ed, 2000
  • 128. Nutrition In Burns  Give 25 kcl/kg body weight + 40 kcl / % body surface area burnt in the adult  The child needs more calories / kg body weight  The infant needs 90 – 100 kcl / kg Cuschieri A, Steele R J , Moosa A R : Management of the burns victim in Essential Surgical Practice, Basic Surgical Training, 4th Ed. 2001, p 116
  • 129. Nutrition Requirements  Carbohydrate provides 16.8 kJ/g (4.1 kcal/g)  Fat provides 37.8 kJ/g (9.1 kcal/g) The number of nonprotein kilojoules given should bear a definite relationship to the nitrogen intake. A typical regime would feature 8400 kJ (2000 kcal) to 13 g nitrogen ( about 150 to 1 ). Goode A W : Nutritional support and rehabilitation in Bailey and Love, 23rd Ed 2000
  • 130. Nutrition Nitrogen requirements A healthy adult in positive nitrogen balance needs 35-40 g of protein or 5.5 -6.5g of nitrogen a day.The hypercatabolic patient requiring hyperalimentation may need 3 to 4 times this amount of protein. Goode A W: Nutritional support and rehabilitation in Bailey & Love 23rd ed 2000
  • 131. Nutrition Methods of feeding Enteral  Oral  Nasogastric tube  Gastrostomy : Stamm temporary Janeway permanent PEG  Jejunostomy
  • 132. Nutrition Complications of enteral nutrition  Nutritional and metabolic  Complications of nutrient delivery  Gastrointestinal complications Cuscgeri A, Steele R J C & Moosa A R :Enteral nutrition in Essential Surgical Practice, 4th Ed 2001
  • 133. Nutrition Methods of feeding Parenteral  Used in < 4 – 5% of all hospital admissions  Used when enteral feeding is not possible or to supplement enteral feeding  Indications: Short term Long term ( HPN )
  • 134. Nutrition Complications of parenteral nutrition  Catheter related  Nutritional and metabolic  Effect on other organ systems Cuscheri A, Steele R J C and Moosa A R : Parenteral nutrition in Essential Surgical Practice, 4th Ed. 2001
  • 135. Nutrition Complications of parenteral nutrition Catheter related  Infection  Thrombosis  Occlusion  Fracture Cuscheri A, Steele R J C& Moosa A R : Parenteral nutrition in Essential Surgical Practice, 4th Ed 2001
  • 136. Nutrition Complications of parenteral nutrition Nutritional and metabolic  Fluid overload  Hyperglycaemia  Electrolyte imbalance  Micronutrient deficiencies eg selenium in long-term patients Cuscheri A, Steele & Moosa A R: Parenteral nutrition in Essential Surgical Practice, 4th Ed 2001
  • 137. Nutrition Complications of parenteral nutrition Effect on other organ systems  Hepatobiliary system – biliary sludge, hepatic steatosis, cholestasis  The immune system  Skeleton – metabolic bone disease Cuscheri A, Steele JR J C & Moosa A R : Parenteral nutrition in Essential Surgical Practice, 4thEd 2001
  • 138. Nutrition Monitoring feeding regimens in parenteral nutrition Daily  Body weight  Fluid balance  FBC, U&E  Blood glucose  Urine and plasma osmolality  Electrolyte and nitrogen analysis of urine and gastrointestinal losses  Acid-base status Goode A W : Nutritional support and rehabilitation in Bailey and Love 23rd Ed, 2000
  • 139. Nutrition Monitoring feeding regimens in parenteral nutrition Every 10 days  Serum B12, Folate, Iron, lactate and triglycerides  Trace elements Goode A W: Nutritional support and rehabilitation in Bailey & Love 23rd Ed, 2000
  • 140. Nutrition Monitoring feeding regimens in parenteral nutrition Three times weekly  Serum Calcium, magnesium and phosphate  Plasma proteins  LFTs  Clotting studies Goode A W : Nutritional support and rehabilitation in Bailey & Love, 23rd Ed 2000
  • 141. Nutrition “Imprisoned in every fat man, a thin one is wildly signalling to be let out” - Cyril Connolly (1903 – 1974)