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Dilated cardiomyopathy (DCM) of other aetiologies is usually progressive, and is associated with significant morbidity and mortality. We report a case of DCM associated with severe hypothyroidism with marked improvement on restoration of euthyroid state. Our case is unique in that the patient had no known risk factors for cardiac disease and experienced marked improvement despite being on minimal doses of HF medications, illustrating the relationship between hypothyroidism and development of left ventricular dysfunction, and its reversible nature with restoration of euthyroid status.<\/jats:p>","DOI":"10.1136\/bcr-2015-212045","type":"journal-article","created":{"date-parts":[[2015,10,14]],"date-time":"2015-10-14T12:22:31Z","timestamp":1444825351000},"page":"bcr2015212045","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":2,"title":["Hypothyroid heart: myxoedema as a cause of reversible dilated cardiomyopathy"],"prefix":"10.1136","volume":"2015","author":[{"given":"Nidhi","family":"Madan","sequence":"first","affiliation":[{"name":"Department of Internal Medicine, Jacobi Medical Center\/Albert Einstein College of Medicine, Bronx, New York, 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