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Families With Myotonic Dystrophy With and Without Cardiac Involvement
Rollin J. Hawley, MD;
John S. Gottdiener, MD;
Judith A. Gay;
W. King Engel, MD
Arch Intern Med. 1983;143(11):2134-2136.
Abstract
• Study of 30 patients with myotonic dystrophy and 17 unaffected family members in a total of 18 families by echocardiography and ECG, including noninvasive His-bundle recording, appeared to show two phenotypes of myotonic dystrophy: those with and those without substantial cardiac involvement. Besides the 29% incidence of asymptomatic mitral valve prolapse common to many neuromuscular diseases, 20% of families had progressive involvement of the cardiac conduction system. It is important to recognize these families in order to treat patients with cardiac pacemakers who are rapidly progressive or symptomatic. If one patient with myotonic dystrophy is found to have myotonic heart disease with cardiac block or arrhythmia, it should be expected in other family members with myotonic dystrophy.
(Arch Intern Med 1983;143:2134-2136)
Author Affiliations
From the Neurology (Dr Hawley) and Medical (Dr Gottdiener and Ms Gay) Services, District of Columbia Veterans Administration Medical Center and Georgetown University School of Medicine, Washington, DC; and the Neurology Branch, National Institute of Neurological and Communicative Disorders and Stroke, National Institutes of Health, Bethesda, Md (Dr Engel).
Footnotes
Accepted for publication April 20, 1983.
Reprint requests to Neurology Service (127), DC VA Medical Center, 50 Irving St NW, Washington, DC 20422 (Dr Hawley).
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