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[Kinesigenic supplementary motor seizure? A case report]
K Takahashi1, S Hashimoto, T Suenaga
1Department of Neurology, Tenri Hospital.
Rinsho Shinkeigaku = Clinical Neurology
|January 1, 1997
Summary
Supplementary motor seizures (SMS) and paroxysmal kinesigenic choreoathetosis (PKC) can present similarly. This case highlights a potential overlap, suggesting kinesigenic SMS may share features with PKC.
Area of Science:
- Neurology
- Epileptology
Background:
- Supplementary motor seizure (SMS) and paroxysmal kinesigenic choreoathetosis (PKC) are distinct neurological disorders.
- Differentiating between SMS and PKC can be challenging due to overlapping clinical symptoms.
Observation:
- A 62-year-old woman experienced frequent, brief episodes of tonic posturing, predominantly on the right side.
- Attacks were triggered by movement initiation but also occurred spontaneously and during sleep, with preserved consciousness.
- Ictal scalp EEG revealed high-amplitude beta activity preceding the episodes, with no generalized convulsions.
Findings:
- The patient's presentation shared features of both SMS and PKC, leading to the classification of "kinesigenic SMS."
- Poor response to anticonvulsant therapy necessitated a combination of three drugs.
- Comparison with a previously reported "PKC" case with supplementary motor area epileptiform discharges supports this classification.
Implications:
- This case suggests a potential relationship or spectrum between SMS and PKC.
- Further investigation of similar cases is crucial to understand the connection between kinesigenic and non-kinesigenic forms of these disorders.
- Clarifying the relationship between SMS and PKC could refine diagnostic criteria and treatment strategies.