Supplementary motor seizures mimicking pseudoseizures: Some clinical differences

Andres M Kanner, H. H. Morris, H. Lüders, D. S. Dinner, E. Wyllie, S. V. Medendorp, A. J. Rowan

Research output: Contribution to journalArticle

117 Citations (Scopus)

Abstract

Supplementary motor seizures (SMS) are among the group of frontal lobe seizures that may often be misdiagnosed as pseudoseizures (PS). We designed this study to determine the value of clinical phenomena in distinguishing between the two. In a series of patients with SMS, we identified those with signs and symptoms mimicking PS and compared the clinical phenomena with those of clinically similar PS. We found that SMS are short in duration, stereotypic, tend to occur in sleep, and often present with a tonic contraction of the upper extremities in abduction. This sign was specific for SMS, particularly when occurring at the onset. Conversely, PS are long in duration, nonstereotypic, and occur in the awake state. We conclude that clinical phenomena may be useful in distinguishing PS from SMS, although the final diagnosis must be documented by neurophysiologic means.

Original languageEnglish (US)
Pages (from-to)1404-1407
Number of pages4
JournalNeurology
Volume40
Issue number9
StatePublished - Sep 1990
Externally publishedYes

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Seizures
Frontal Lobe
Diagnostic Errors
Upper Extremity
Signs and Symptoms
Sleep

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Kanner, A. M., Morris, H. H., Lüders, H., Dinner, D. S., Wyllie, E., Medendorp, S. V., & Rowan, A. J. (1990). Supplementary motor seizures mimicking pseudoseizures: Some clinical differences. Neurology, 40(9), 1404-1407.

Supplementary motor seizures mimicking pseudoseizures : Some clinical differences. / Kanner, Andres M; Morris, H. H.; Lüders, H.; Dinner, D. S.; Wyllie, E.; Medendorp, S. V.; Rowan, A. J.

In: Neurology, Vol. 40, No. 9, 09.1990, p. 1404-1407.

Research output: Contribution to journalArticle

Kanner, AM, Morris, HH, Lüders, H, Dinner, DS, Wyllie, E, Medendorp, SV & Rowan, AJ 1990, 'Supplementary motor seizures mimicking pseudoseizures: Some clinical differences', Neurology, vol. 40, no. 9, pp. 1404-1407.
Kanner AM, Morris HH, Lüders H, Dinner DS, Wyllie E, Medendorp SV et al. Supplementary motor seizures mimicking pseudoseizures: Some clinical differences. Neurology. 1990 Sep;40(9):1404-1407.
Kanner, Andres M ; Morris, H. H. ; Lüders, H. ; Dinner, D. S. ; Wyllie, E. ; Medendorp, S. V. ; Rowan, A. J. / Supplementary motor seizures mimicking pseudoseizures : Some clinical differences. In: Neurology. 1990 ; Vol. 40, No. 9. pp. 1404-1407.
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