Effects of subclinical thyroid dysfunction on the heart.

Abstract:

BACKGROUND:Mounting evidence indicates that subclinical thyroid dysfunction has important clinical effects and prognostic implications, supporting the view that it is not a compensated biochemical change sensu strictu. PURPOSE:To review clinical information on the effects of subclinical thyroid dysfunction on the heart. DATA SOURCES:English-language articles identified from files and a MEDLINE search (1970-September 2001), references of relevant articles, textbooks, and meeting abstracts. STUDY SELECTION:Reports on the effects of subclinical hypothyroidism and subclinical hyperthyroidism on the cardiovascular system in humans. DATA EXTRACTION:Data on cardiac structure and performance, arrhythmias, and risk for coronary artery disease were independently assessed by all authors and summarized. DATA SYNTHESIS:Subclinical hypothyroidism is associated with impaired left ventricular diastolic function at rest, systolic dysfunction on effort, and enhanced risk for atherosclerosis and myocardial infarction. Subclinical hyperthyroidism is associated with increased heart rate, atrial arrhythmias, increased left ventricular mass with marginal concentric remodeling, impaired ventricular relaxation, reduced exercise performance, and increased risk for cardiovascular death. All abnormalities were reversed by restoration of euthyroidism (subclinical hypothyroidism) or were blunted by beta-blockade and tailoring of the l -thyroxine dose (subclinical hyperthyroidism). CONCLUSION:The heart responds to the minimal but persistent changes in circulating thyroid hormone levels typical of subclinical thyroid dysfunction. Thus, the condition is not a compensated biochemical change sensu strictu, and timely treatment should be considered in an attempt to avoid adverse cardiovascular effects.

journal_name

Ann Intern Med

authors

Biondi B,Palmieri EA,Lombardi G,Fazio S

doi

10.7326/0003-4819-137-11-200212030-00011

subject

Has Abstract

pub_date

2002-12-03 00:00:00

pages

904-14

issue

11

eissn

0003-4819

issn

1539-3704

pii

200212030-00011

journal_volume

137

pub_type

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