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An OSCE case involving discussion with an RMO about a young woman who suffered a seizure at a nightclub following ecstasy use. Candidates must interpret a VBG showing severe hyponatremia, identify SIADH as a likely cause, manage the overdose and electrolyte disturbance, anticipate complications such as hyperthermia and rhabdomyolysis, and provide clear, structured teaching on management and follow-up.