Recurrent acute dystonic reaction and oculogyric crisis despite withdrawal of dopamine receptor blocking drugs.
Adverse events of dopamine-blocking agents include acute dystonic reactions and oculogyric crises (OGCs). OGCs may be recurrent on maintenance of or re-exposure to the drug. Thus, complete withdrawal is recommended. Recurrent episodes of acute dystonia despite withdrawal and the lack of further exposure to antidopaminergic agents are usually not seen. Here, we report three cases with recurrent OGCs despite complete withdrawal of neuroleptics. Triggering or priming factors were a single dose of haloperidol in two cases and a single dose of metoclopramide in one case. Episodes reoccurred spontaneously, but responded to anticholinergics. The pathomechanisms of acute dystonic reactions and OGCs remain unclear. Parallels to levodopa-induced dyskinesias in Parkinson's disease, as well as to dopa-responsive dystonia, paroxysmal dyskinesias, and channelopathies are discussed here. Whether there is a genetic susceptibility or some other reason for only some patients developing this phenomenon remains unclear.
Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, Queen Square, London, United Kingdom.
Susanne A
SA
Schneider
Vrajesh
V
Udani
Charulata Sawant
CS
Sankhla
Kailash P
KP
Bhatia
D000328:Adult; D002648:Child; D018450:Disease Progression; D018492:Dopamine Antagonists / Q000009:adverse effects*; D004409:Dyskinesia, Drug-Induced; D004421:Dystonia / Q000139:chemically induced*; D004569:Electroencephalography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D015835:Ocular Motility Disorders / Q000139:chemically induced
D018492:Dopamine Antagonists