Table 1 Alternative diagnosis: excluded before diagnosing PSH

Including but not limited to the following:

•Infectious process (bacteremia, meningitis, etc.)

•Non-PSH neurological deterioration (increased ICP, intracranial haemorrhage, intracranial oedema, seizures, encephalitis)

•Pulmonary embolism

•Thyrotoxicosis

•Alcohol or drug withdrawal

•Neuroleptic malignant syndrome

•Serotonin syndrome

•Malignant hyperthermia