Psychotropic Drug-Related Rhabdomyolysis

Neuroleptic malignant syndrome is a rare but serious adverse effect of antipsychotic medication. The author describes three new cases and reviews 50 others published in the past 5 years. Demographic and clinical features, diagnosis, treatment, outcome, and pathophysiology are critically reviewed, and a new set of diagnostic criteria, incorporating physical signs and routine laboratory tests, is proposed.

Myoglobinuria may follow extreme muscular exertion or disorders that cause muscle necrosis. Dystonia has not been implicated previously. We studied an 8-year-old boy of non-Jewish, Mexican-American descent with autosomal-dominant dystonia musculorum deformans who developed rapidly progressive and severe generalized dystonia, hyperpyrexia, myoglobinuria, and renal failure. Curarization was required. Transient improvement was achieved with tetrabenazine and baclofen, but bilateral thalamotomy was then performed. Patients with severe dystonia should be observed for evidence of myoglobinuria.