The prevalence of subclinical hyperthyroidism defined as low level of thyroidstimulating hormone and normal levels of circulating peripheral hormones ranges from 1% to 10% depending on the geographical area. The present systematic review by Smedegaard et al. focuses on a possible association between subclinical hyperthyroidism and the risk of developing atrial fibrillation, myocardial infarction, heart failure and cardiovascular mortality. Based on data from 33 previously published papers, the authors conclude that whereas subclinical hyperthyroidism is associated with atrial fibrillation and congestive heart failure it does not seem to be associated with myocardial infarction or cardiovascular mortality.
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Subclinical hyperthyroidism and the risk of developing cardiovascular disease – a systematic review
Stine Bech Smedegaard, Anne Lene Riis, Morten Krogh Christiansen & Jakob Kau Starup Linde