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 Cardioljournal_title
Journal of the American College of Cardiologyauthors
Mangiardi L,Gaita F,Brun S,Presbitero P,Nademanee K,Singh BNdoi
10.1016/s0735-1097(86)80279-0subject
Has Abstractpub_date
1986-01-01 00:00:00pages
180-4issue
1eissn
0735-1097issn
1558-3597pii
S0735-1097(86)80279-0journal_volume
7pub_type
杂志文章abstract::Six patients referred for echocardiographic evaluation in whom an unusual echocardiographic sign resulted from air within the mediastinum or pericardium are described. Three patients had a pneumomediastinum that occurred after chest trauma and three patients had a pneumopericardium induced during a therapeutic pericar...
journal_title:Journal of the American College of Cardiology
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更新日期:2003-04-02 00:00:00
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更新日期:2014-04-01 00:00:00
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更新日期:2007-12-04 00:00:00
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更新日期:2007-05-29 00:00:00
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pub_type: 杂志文章
doi:10.1016/j.jacc.2005.04.066
更新日期:2005-11-01 00:00:00
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更新日期:2009-05-05 00:00:00
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更新日期:2012-11-06 00:00:00
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pub_type: 杂志文章
doi:10.1016/0735-1097(92)90386-2
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更新日期:2020-12-01 00:00:00
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更新日期:2008-07-29 00:00:00
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doi:10.1016/j.jacc.2010.05.007
更新日期:2010-09-07 00:00:00
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更新日期:2002-11-20 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2010-01-26 00:00:00
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更新日期:2018-01-30 00:00:00
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更新日期:2018-10-09 00:00:00
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更新日期:1990-12-01 00:00:00
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journal_title:Journal of the American College of Cardiology
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更新日期:1988-08-01 00:00:00
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journal_title:Journal of the American College of Cardiology
pub_type: 杂志文章,评审
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更新日期:1995-10-01 00:00:00
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更新日期:1994-11-15 00:00:00