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A Case of Transient 2:1 Atrioventricular Block, Resolved by Thyroxine Supplementation for Subclinical Hypothyroidism
Author(s) -
NAKAYAMA YUKITERU,
OHNO MAKOTO,
YONEMURA SHIGETO,
UOZUMI HIROKI,
KOBAYAKAWA NAOSHI,
FUKUSHIMA KAZUYUKI,
TAKEUCHI HIROAKI,
AOYAGI TERUHIKO
Publication year - 2006
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.2006.00284.x
Subject(s) - medicine , atrioventricular block , bradycardia , subclinical infection , cardiology , heart block , heart rate , electrocardiography , anesthesia , blood pressure
A 42‐year‐old man was admitted to our hospital with palpitation attacks. Holter ECG showed 2:1 atrioventricular block and bradycardia with the minimum heart rate of 44 beats/min. There was a possible indication of electrophysiological study and cardiac pacemaker implantation. Laboratory data on admission revealed elevated thyrotropin level, with normal thyroxine level. To rule out functional atrioventricular block, we tried 2 weeks of the thyroxine supplementation, and Holter ECG showed improved heart rate without any atrioventricular block or long pause. We experienced that subclinical hypothyroidism caused severe bradycardia and 2:1 atrioventricular block, and that thyroxine supplementation completely improved these conditions.