A Rapid Improvement of Heart Failure after Treatment of Hyperthyroidism

Background: Heart failure is a rare condition of thyrotoxicosis. We report a case of thyrotoxicosis-inducing heart failure. Case report: A 29-year old female had been suffered from thyrotoxicosis for 3 years without proper medication. She complained progressive dyspnea and palpitation with atrial fibrillation with rapid ventricular response. Marked cardiomegaly, and severe right ventricular dysfunction with biatrial enlargements were found on Two-dimensional (2D) echocardiography. We treated her with medications for heart failure and thyrotoxicosis, and the patient’s symptoms and objective cardiac functions are improved after two weeks. Conclusion: Severe heart failure caused by thyrotoxicosis could be reversible with proper management. Patients who have thyrotoxicosis should be assessed closely, and suitable treatment can markedly improve the patient’s prognosis.