Complete Atrioventricular Block Presenting With Syncope Caused by Severe Hypothyroidism

Sang-Hoon Seol, Doo-Il Kim, Bo-Min park, Dong-Kie Kim, Pil-Sang Song, Ki-Hun Kim, Han-Young Jin, Jeong-Sook Seo, Jae-Sik Jang, Tae-Hyun Yang, Dae-Kyeong Kim, Dong-soo Kim

Abstract


A 75-year-old man was admitted to our hospital with syncope. Electrocardiogram showed complete atrioventricular block and bradycardia with the minimum heart rate of 22 beats/ min. There was a possible indication for temporary cardiac pacemaker implantation. Laboratory data on admission revealed high TSH level with low free T4 level. To rule out functional atrioventricular block, we treated several days with thyroxine. A follow-up electrocardiogram showed improved heart rate without any atrioventricular block. We found that severe hypothyroidism caused a complete atrioventricular block with syncope, and thyroxine replacement completely improved these conditions.




Cardiol Res. 2012;3(5):239-241
doi: https://doi.org/10.4021/cr221w

Keywords


Hypothyroidism; Syncope; Atrioventricular block

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