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Hyperkalemic periodic paralysis

An apparent sporadic Case

Departments of Neurology, (Drs. Riggs, Moxley, Griggs, and Homer), Pediatrics (Drs. Moxley, Griggs, and Horner), and Medicine (Dr. Griggs), University of Rochester School of Medicine and Dentistry, Rochester, NY.

Sporadic cases of hyperkalemic periodic paralysis are rare. We studied a 2-year-old girl with clinically typical hyperkalemic periodic paralysis except for a negative family history. Results of genetic and provocative testing in immediate family members suggest that hyperkalemic periodic paralysis may be genetically heterogeneous. Acetazolamide prevented attacks and improved myotonia in this sporadic case.

Address correspondence and reprint requests to Dr. Riggs, Department of Neurology, West Virginia University Medical Center, Morgantown, WV 26506.

This work was supported in part by grants from the Muscular Dystrophy Association, Inc., The Gannett Foundation, and U.S. Public Health Service Grant No. RR 00044 from the Division of Research Resources of the National Institutes of Health.

Accepted for publication December 19, 1980.

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