Atrioventricular block complicating amiodarone-induced hypothyroidism in a patient with pre-excitation and rate-dependent bilateral bundle branch block.

Abstract:

:As a clinical entity atrioventricular (AV) block due to hypothyroidism is rare. Such a case induced by hypothyroidism complicating long-term therapy with amiodarone in a 45 year old woman with pre-excitation is presented. Electrophysiologic data obtained before and during thyroxine replacement therapy showed that hypothyroidism lengthens the effective refractory period of the atria, AV node, bypass tract and His-Purkinje system (that in the ventricle not being measured); this lengthening resembles the effects of long-term administration of amiodarone. These observations suggest that depressed thyroid function may be protective against arrhythmias but a patient with preexisting conduction system disease may develop AV block. The tendency to develop AV block in a patient who is euthyroid was reduced by bypass tract conduction. These findings are significant not only in monitoring amiodarone effects during chronic prophylactic drug therapy but also in providing further insight into the complex interrelation between the action of the drug and the thyroid hormones on cardiac muscle.

journal_name

J Am Coll Cardiol

authors

Mangiardi L,Gaita F,Brun S,Presbitero P,Nademanee K,Singh BN

doi

10.1016/s0735-1097(86)80279-0

subject

Has Abstract

pub_date

1986-01-01 00:00:00

pages

180-4

issue

1

eissn

0735-1097

issn

1558-3597

pii

S0735-1097(86)80279-0

journal_volume

7

pub_type

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