A case of transient 2:1 atrioventricular block, resolved by thyroxine supplementation for subclinical hypothyroidism

Yukiteru Nakayama, Makoto Ohno, Shigeto Yonemura, Hiroki Uozumi, Naoshi Kobayakawa, Kazuyuki Fukushima, Hiroaki Takeuchi, Teruhiko Aoyagi

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)106-108
    Number of pages3
    JournalPACE - Pacing and Clinical Electrophysiology
    Volume29
    Issue number1
    DOIs
    Publication statusPublished - 2006 Jan 1

    Keywords

    • Atrioventricular block
    • Bradycardia
    • Hashimoto disease
    • Subclinical hypothyroidism

    ASJC Scopus subject areas

    • Cardiology and Cardiovascular Medicine

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