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Report of 10 Cases and Review of Electromyographic Findings

David E. Kelley, MD; Hossein Gharib, MD; Frank P. Kennedy, MD; Ralph J. Duda, Jr, MD; Philip G. McManis, MB,BS, FRACP

Arch Intern Med. 1989;149(11):2597-2600.

Abstract
• We reviewed the clinical characteristics of 10 patients with thyrotoxic periodic paralysis. In these patients, a relatively uniform group of young men, the periodic paralysis developed nearly concurrently with the onset of hyperthyroidism. The attacks were precipitated most frequently by rest and by exercise and, occasionally, by ingestion of a large carbohydrate load. In each patient, the paralysis resolved on return of euthyroidism. The approximate incidence rate for thyrotoxic periodic paralysis in our largely white North American patient population (all hyperthyroidism cases) ranged from 0.1% to 0.2%, which is one tenth the rate reported for Oriental populations. In 7 patients, electrodiagnostic testing revealed characteristic changes in compound muscle action potential amplitude in response to exercise of the muscle being tested.

(Arch Intern Med. 1989;149:2597-2600)

Author Affiliations
From the Division of Endocrinology, Metabolism, and Internal Medicine (Drs Kelley, Gharib, Kennedy, and Duda) and Department of Neurology (Dr McManis), Mayo Clinic and Mayo Foundation, Rochester, Minn.

Footnotes
Accepted for publication May 18, 1989.

Reprint requests to Division of Endocrinology, Metabolism, and Internal Medicine, Mayo Clinic, Rochester, MN 55905 (Dr Gharib).

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