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Case study of thyrotoxic cardiomyopathy
  1. Syed T Alam and
  2. Justin Zaman
  1. Department of Cardiology, James Paget University Hospitals NHS Foundation Trust, Great Yarmouth, UK
  1. Correspondence to Dr Syed T Alam, syedtanveer.alam{at}


We present the case of a 65-year-old woman who was referred urgently from primary care with worsening breathlessness for 3 weeks, associated with tachycardia and left bundle branch block (LBBB). She had a background of type 2 diabetes, asthma and hypertension. Initial ECG revealed atrial fibrillation with the fast ventricular rate on the background of LBBB. ECHO findings were consistent with systolic impairment. Initial testing including checking thyroid function test revealed hyperthyroidism. It became evident that this patient had thyrotoxic cardiomyopathy. Early advice from the endocrine team was sought and the patient was treated with a combination of carbimazole and ivabradine. After a hospital stay, she made a remarkable recovery.

  • arrhythmias
  • heart failure
  • thyroid disease

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  • Contributors STA and JZ: contributed to the design and implementation of the case report and to the writing of the manuscript.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Patient consent for publication Obtained.