Robert C. Griggs, M.D., F.A.C.P.; Robert J. Davis, M.D.; David Anderson, M.D.
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Having observed the sudden appearance of complete heart block in three patients with myotonic dystrophy, we prospectively studied cardiac conduction in other patients with the disorder. Routine electrocardiography in 23 adults with myotonic dystrophy showed first-degree A-V block (second-degree heart block) in 14 and right bundle-branch block in 1. In seven patients the ECG abnormality was noted during family screening before the clinical diagnosis was made. Eight patients with first-degree heart block underwent His-bundle electrocardiography to define more accurately the site of conduction abnormalities. Conduction time through the A-V node was prolonged in one patient, whereas all eight patients had
Griggs RC, Davis RJ, Anderson D. Cardiac Conduction Abnormalities in Myotonic Dystrophy.. Ann Intern Med. 1973;78:819–820. doi: 10.7326/0003-4819-78-5-819_5
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Published: Ann Intern Med. 1973;78(5):819-820.
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Print ISSN: 0003-4819 | Online ISSN: 1539-3704
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