Pathophysiological studies of neuromuscular function in subacute organophosphate poisoning induced by phosmet

J. L. Good, R. K. Khurana, R. F. Mayer, W. M. Cintra, E. X. Albuquerque

Research output: Contribution to journalArticlepeer-review

Abstract

A 51 year old man developed progressive cranial and proximal muscle weakness, hyperreflexia and mental change. The disorder progressed over 9 days following the fifth weekly spraying with the organophosphate (OP) insecticide, phosmet, with limited symptoms of acute toxicity. Marked decremental responses of 50-80% on slow and fast rates of stimulation were improved to 15% by edrophonium or neostigmine. Intracellular recordings at the endplate region of intercostal muscle revealed small miniature endplate potentials (mepps), reduced mean acetylcholine sensitivity and normal membrane potentials. Electron microscopy revealed degeneration and regeneration of the endplates. This study demonstrates that OP poisoning due to phosmet can produce a subacute postsynaptic neuromuscular syndrome without marked symptoms of acute toxicity.

Original languageEnglish (US)
Pages (from-to)290-294
Number of pages5
JournalJournal of Neurology Neurosurgery and Psychiatry
Volume56
Issue number3
DOIs
StatePublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Surgery
  • Clinical Neurology
  • Psychiatry and Mental health

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