A. Difficult bag mask ventilation
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1. Neurophysiologic derangement (raised intracranial pressure)
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• A + (any of physiological derangement 1....8)
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B. Difficult supraglottic device placement
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2. Cardiovascular derangement (derangements of preload, afterload, contractility or rhythm)
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• B + (any of physiological derangement 1....8)
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C. Difficult intubation
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3. Respiratory derangement (hypoxemia and hypercarbia)
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• C + (any of physiological derangement 1....8)
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D. Difficult surgical airway
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4. Hepatic derangement (raised intracranial pressure and coagulopathy)
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• D + (any of physiological derangement 1....8)
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5. Renal derangement (encephalopathy, pulmonary oedema, hyperkalemia and metabolic acidosis)
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6. Gut derangement (raised intra-abdominal pressure, abdominal compartment syndrome)
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7. Severe sepsis (lactic acidosis, distributive shock multiple organ dysfunction)
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