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Symptomatic and essential rhythmic palatal myoclonus.

G Deuschl¹, G Mischke, E Schenck

¹Neurologische Klinik und Poliklinik, Universität Freiburg, FRG.

Brain : a Journal of Neurology

|December 1, 1990

Summary

Rhythmic palatal myoclonus (RPM) is a rare movement disorder. This study distinguishes essential RPM from symptomatic RPM based on clinical features and patient demographics.

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Area of Science:

Neurology
Movement Disorders

Background:

Rhythmic palatal myoclonus (RPM) is a rare condition characterized by involuntary soft palate jerks.
RPM can be symptomatic, linked to brainstem or cerebellar disease, or essential, without a clear structural cause.

Purpose of the Study:

To statistically analyze literature cases to identify criteria differentiating symptomatic and essential RPM.
To establish essential RPM as a distinct clinical entity.

Main Methods:

A statistical analysis of 287 published cases of RPM (210 symptomatic, 77 essential).
Comparison of clinical features, demographics, and response to physiological states between symptomatic and essential RPM groups.

Main Results:

Essential RPM patients typically report ear clicks, are younger, have a balanced sex distribution, and lower jerk frequency compared to symptomatic RPM.

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Symptomatic RPM shows a male preponderance and involvement of other cranial nerves.

Rhythmicity in essential RPM is more affected by sleep, coma, and anesthesia.

Conclusions:

Essential RPM should be recognized as a distinct clinical entity separate from symptomatic RPM.
Symptomatic RPM pathogenesis involves hypertrophied inferior olives, while essential RPM may be a functional analogue possibly due to transmitter changes.
Understanding RPM may offer insights into other rhythmic hyperkinesias.