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Disappearing palatal Myoclonus

From the Department of Neurology, Harry M. Dent Neurologic Institute, Millard Fillmore Hospital, and the Departments of Neurology (Dr. Jacobs), Ophthalmology (Dr. Jacobs), and Physiology (Dr. Jacobs end Ms. Bozian), School of Medicine at Buffalo, NY, and the Experimental Therapeutics Branch (Dr. Newman), National Institute of Neurological and Communicative Disorders and Stroke, National Institutes of Health, Bethesda, MD.

Two patients had palatal myoclonus that disappeared. In one, the palatal myoclonus disappeared completely during all stages of natural sleep only to return again when he awoke, persisting as long as he remained awake. In the other patient, palatal myoclonus was continuous for 2 years, became erratic for 6 months, and then disappeared completely, although she could induce it voluntarily. These cases demonstrate that palatal myoclonus is not always: independent of the sleep-waking cycle, persistent throughout life, and independent of cortical control.

Address correspondence and reprint requests to Dr. Jacobs, Dent Neurologic Institute, Millard Fillmore Hospi.ta1, 3 Gates Circle, Buffalo, NY 14209.

Supported by grants from Delaware North, Inc., and the Dent Family Foundation, Buffalo, NY.

Presented in part at the thirty-second annual meeting of the American Academy of Neurology, New Orleans, LA, May 1980.

Accepted for publication September 8, 1980.

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