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Paralytic shellfish poisoning: a case report and serial electrophysiologic observations
R R Long1, J C Sargent, K Hammer
1Department of Neurology, University of Massachusetts Medical Center, Worcester 01655.
Neurology
|August 1, 1990
Summary
Saxitoxin-contaminated shellfish can cause acute paralysis by blocking sodium channels. Electrophysiologic studies revealed temporary nerve conduction abnormalities that resolved within 5 days, distinguishing this poisoning from other paralytic conditions.
Area of Science:
- Neuroscience
- Toxicology
- Clinical Electrophysiology
Background:
- Saxitoxin is a potent neurotoxin found in certain marine organisms, including shellfish.
- Ingestion of contaminated shellfish can lead to paralytic shellfish poisoning (PSP).
- PSP is characterized by rapid onset of neuromuscular paralysis, including bulbar and respiratory muscles.
Observation:
- Serial electrophysiologic assessments were performed on a patient experiencing acute bulbar and respiratory paralysis.
- The patient's paralysis followed the ingestion of clams suspected to be contaminated with saxitoxin.
- Electrophysiologic testing was crucial for monitoring the progression and resolution of neurological deficits.
Findings:
- Initial electrophysiologic findings included prolonged distal motor and sensory latencies.
- Conduction velocities were significantly slowed, and amplitudes were moderately diminished.
- All electrophysiologic parameters normalized within a 5-day period, indicating a reversible process.
Implications:
- The observed electrophysiologic changes are consistent with incomplete sodium channel blockade by saxitoxin.
- These findings aid in differentiating paralytic shellfish poisoning from other acute paralytic neurological disorders.
- Electrophysiology serves as a valuable tool for diagnosing and monitoring saxitoxin-induced neurotoxicity.