Morphine can be used for all the following therapeutic indications EXCEPT:

Correct Answer: B

Rationale: Morphine treats MI pain (choice A), postoperative pain (choice C), and pulmonary edema (choice D) by reducing pain and preload. Head injury pain (choice B) contraindicates it due to respiratory depression and ICP risks. This exception guides safe use.

Correct Answer: D

Rationale: Chloral hydrate (choice D) is metabolized to trichloroethanol, which depresses the CNS, inducing sedation. Morphine (choice A) metabolizes to active compounds like morphine-6-glucuronide, not trichloroethanol. Clorazepate (choice B) becomes desmethyldiazepam, a benzodiazepine. Phenobarbitone (choice C) is a barbiturate, not metabolized to trichloroethanol. This identifies Chloral hydrate's metabolic pathway, key for its hypnotic use.

Correct Answer: C

Rationale: The patient most likely experienced anterograde amnesia upon recovery from sedation because diazepam was given before the procedure to induce conscious sedation, which can cause temporary memory loss of events that occurred after administration.

Correct Answer: B

Rationale: Bicuculline is a competitive antagonist of GABA-A receptors, blocking inhibitory neurotransmission and potentially inducing seizures.

Correct Answer: D

Rationale: Spinal anesthesia level is influenced by multiple factors including drug volume gravity and patient posture.