Commoner ICU causes

Central

Cerebrovascular accident, drugs (e.g. opiates, sedatives), raised intracranial pressure, trauma

Brainstem/spinal cord

Trauma (at or above phrenic level), tetanus, Pickwickian syndrome, motor neurone disease

Neuropathy

Guillain-Barre, critical illness polyneuropathy

Neuromuscular

Muscle relaxants, organophosphorus poisoning, myasthenia gravis

Chest wall/muscular

Flail chest, heart failure, myopathy (including critical illness and disuse myopathy)

Airways

Upper airways obstruction, airway disruption, asthma, anaphylaxis

Parenchymal

Pneumonia, ARDS, fibrosis, pulmonary oedema

Extrapulmonary

Pneumothorax, pleural effusion, haemothorax

Circulatory

Pulmonary embolus, heart failure, Eisenmenger intracardiac shunt

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