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Summary
Fatal hyperpyrexia occurred due to high doses of chlorpromazine and benztropine mesylate in a schizophrenic patient. Treatment focuses on reducing body temperature and oxygen demand, with careful management of acidosis and avoidance of vasoconstrictors.
Area of Science:
- Pharmacology
- Toxicology
- Psychiatry
Background:
- Phenothiazines, like chlorpromazine, can disrupt the body's thermoregulation.
- Anticholinergic effects of medications, including benztropine mesylate, can impair sweating.
- Drug-induced hyperpyrexia is a serious adverse reaction requiring prompt medical intervention.
Observation:
- A case of fatal hyperpyrexia is presented in a paranoid schizophrenic patient.
- The hyperpyrexia was associated with massive doses of chlorpromazine and benztropine mesylate.
- The patient experienced increased psychotic symptoms prior to the adverse event.
Findings:
- Phenothiazines interfere with thermoregulation and reduce peripheral sweating.
- Massive doses of chlorpromazine and benztropine mesylate can lead to severe hyperpyrexia.
- Effective treatment involves reducing core temperature and oxygen demand.
Implications:
- Prompt cooling measures (ice water, fanning, immersion) are crucial for managing hyperpyrexia.
- Oxygenation is vital to prevent tissue anoxia.
- Correction of severe acidosis with sodium bicarbonate is necessary, guided by arterial pH.
- Vasoconstrictors should be avoided in cases of shock associated with hyperpyrexia.