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April 21, 1978

Complete Heart Block With Hyperthyroidism

Author Affiliations

From the Department of Internal Medicine, Kaiser Permanente Medical Center, Los Angeles.

JAMA. 1978;239(16):1644-1646. doi:10.1001/jama.1978.03280430060018

Thyrotoxicosis developed in a patient while receiving thyroid hormone therapy for clinical hypothyroidism. The development of second-degree heart block of Mobitz type 1 variety was followed by third- and then firstdegree heart block. We conclude that the varying degrees of heart block were secondary to hyperthyroxinemia caused by Graves' disease and exogenous thyroid hormone.

(JAMA 239:1644-1646, 1978)