ISSN 1016-5169 | E-ISSN 1308-4488
Archives of the Turkish Society of Cardiology
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Supra-His complete atrioventricular block in a patient with subclinical hyperthyroidism [Turk Kardiyol Dern Ars]
Turk Kardiyol Dern Ars. 2011; 39(8): 693-696 | DOI: 10.5543/tkda.2011.01574

Supra-His complete atrioventricular block in a patient with subclinical hyperthyroidism

Basri Amasyalı, Cem Barcin, Ayhan Kılıç
Gata Military Medical Hospital, Department of Cardiology, Ankara, Turkey

Subclinical hyperthyroidism is a difficult entity to diagnose because of silent clinical features and it may be easily underdiagnosed unless it is suspected and thyroid hormone levels are examined. Although atrioventricular (AV) conduction abnormalities such as complete heart block may occasionally be seen in hyperthyroidism, its association with subclinical hyperthyroidism has not been reported previously. We report on a 50-year-old female patient who did not have any systemic or cardiovascular disease or history of drug use that could affect AV conduction and presented with presyncope and complete heart block with narrow QRS complexes. Thyroid function tests showed subclinical hyperthyroidism and an electrophysiological study showed the supra-His level as the site of complete AV block. After initiation of antithyroid treatment (propylthiouracil), the patient’s rhythm improved to second-degree AV block on the third day and returned to normal sinus rhythm on the fourth day.

Keywords: Atrioventricular block/etiology, electrocardiography, hyperthyroidism/complications

How to cite this article
Basri Amasyalı, Cem Barcin, Ayhan Kılıç. Supra-His complete atrioventricular block in a patient with subclinical hyperthyroidism. Turk Kardiyol Dern Ars. 2011; 39(8): 693-696

Corresponding Author: Basri Amasyalı, Türkiye
Manuscript Language: Turkish


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