Aims
Early recognition Early goal directed therapy Source control
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Less than one half of the patients who have signs and symptoms of sepsis have positive blood culture results.
Fishing in the dark
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50 year old male smoker Right hemicolectomy for colon cancer Day 5 post-op Temperature 37.2°C WCC 15.2 Respiratory rate 30/min HR 110/min
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What is going on?
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Confused Oliguric BP 80/40
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Although the 1991 Consensus Conference laid the framework to define sepsis, it had important limitations.
The “2 out of 4” criteria for SIRS and the thresholds were somewhat arbitrary and not specific to sepsis alone.
The criteria did not include biochemical markers, such as CRP, procalcitonin, IL-6, all of which are elevated in sepsis.
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The criteria for sepsis were revised to include infection and the presence of any of the diagnostic criteria.
These criteria were based on an expansion of the clinical and laboratory parameters.
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There was no single parameter or set of clinical or laboratory parameters that are adequately sensitive or specific to diagnose sepsis.
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Challenge
Early recognition remains a challenge.
Tissue hypoperfusion can occur in the absence of hypotension and could be present for hours before organ dysfunction manifests.
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Spectrum of sepsis continuum
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SIRS
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Sever sepsis, SIRS plus organ dysfunction
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Sepsis is described as an autodestructive process.
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It permits extension of the normal pathophysiologic response to infection to involve otherwise normal tissues and results in MODS.
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Severe sepsis & septic shock Severe sepsis
Sepsis plus organ
dysfunction, hypotension or hypoperfusion
Septic shock Sepsis hypotension despite
adequate fluid resuscitation
plus evidence of abnormal perfusion
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What do you want to do for this patient?
What are your goals?
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Management principles
Early aggressive resuscitation Early treatment
Rapid identification of source of sepsis Early source control Early, appropriate antibiotics
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Initial history& examination
Resuscitate
Further history& examination
Microbiologicalspecimens
Antibiotics
1 h
our
Investigations
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Need to work rapidly to achieve goals: to administer antibiotics within 1
hour. In this time the patient has to be
resuscitated, diagnosis made and
microbiological specimens taken
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Resuscitate
Fluid resuscitate Fluid challenges
300-500 ml colloid 500-1000 ml crystalloid
Titrate against response (BP & tissue perfusion) and adverse effects
Ignore fluid balance in first 24h
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Resuscitate
Vasopressors Indications:
Hypotension not responsive to fluid Life threatening hypotension
Agents: Norepinephrine Dopamine
Dobutamine Tissue hypoperfusion despite adequate fluid
resuscitation and blood pressure
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CVP 10 BP 110/50, MAP 65 Urine output 50 ml/h Central venous saturation 65%
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Resuscitation Goals
Initial target: MAP 65 mmHg CVP 8-12 mmHg (12-15 if ventilated)
Rise of 3-5 mmHg after fluid challenge
Urine output 0.5 ml/kg
If central venous saturation <70% transfusion of packed cells to achieve a
haematocrit 0.3 dobutamine
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Likely sources of sepsis
Chest Intra-abdominal Urinary tract infection
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Source of sepsis
Breathless, bilateral crackles Abdomen soft Urine dipstick:
WBC 0 Protein +
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Investigations
Other radiology depending on history and examination
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Investigations
Microbiology Blood cultures
2 sets Strict asepsis 20 ml blood sample
Urine specimen Other cultures depending on clinical
features
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Treatment
Assess every patient for a source of infection that is amenable to source control measure
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Treatment
Source control Percutaneous or open drainage Excision Debridement Removal of potentially infected devices
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Treatment
Antibiotics Early Initially cover all likely organisms
Local flora and sensitivity patterns After appropriate microbiological
specimens have been taken
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Likely organisms
Source Environment
Community Healthcare facility Intensive Care Local factors
Patient factors Co-existing illness Previous antibiotics Immunosuppression
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Antibiotics
Healthcare associated peritonitis More resistant flora Similar organisms to those seen in other
nosocomial infections
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Antibiotics
Re-assess Clinical response Microbiological results
Aim to use narrower spectrum
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Antibiotics
Penetration Aminoglycosides and glycopeptides have
relatively poor tissue penetration Most agents have poor CNS penetration
unless meninges inflammed Adverse effects
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Antibiotics
Dual therapy Pseudomonas aeruginosa
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Activated protein C
Withdrawn
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Other Support Modalities
Steroids Glucose control Early RRT in those AKI
Other Support Modalities
Early feeding enteral feeding lowers risk of infection
and improves survival compared with delayed feeding in the critically ill.
Other studies demonstrate the superiority of enteral over parenteral feeding in critically ill patients, with respect to costs and complications, including risk of infection
Summary
Early recognition Early resuscitation Early identification of source Early appropriate antibiotics Early source control
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