TY - JOUR
T1 - A case of transient 2:1 atrioventricular block, resolved by thyroxine supplementation for subclinical hypothyroidism
AU - Nakayama, Yukiteru
AU - Ohno, Makoto
AU - Yonemura, Shigeto
AU - Uozumi, Hiroki
AU - Kobayakawa, Naoshi
AU - Fukushima, Kazuyuki
AU - Takeuchi, Hiroaki
AU - Aoyagi, Teruhiko
PY - 2006/1/1
Y1 - 2006/1/1
N2 - 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.
AB - 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.
KW - Atrioventricular block
KW - Bradycardia
KW - Hashimoto disease
KW - Subclinical hypothyroidism
UR - http://www.scopus.com/inward/record.url?scp=33645112672&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33645112672&partnerID=8YFLogxK
U2 - 10.1111/j.1540-8159.2006.00284.x
DO - 10.1111/j.1540-8159.2006.00284.x
M3 - Article
C2 - 16441726
AN - SCOPUS:33645112672
VL - 29
SP - 106
EP - 108
JO - PACE - Pacing and Clinical Electrophysiology
JF - PACE - Pacing and Clinical Electrophysiology
SN - 0147-8389
IS - 1
ER -