# Dilated Cardiomyopathy and Hyperthyroidism: A Case Report and Literature Review

## TL;DR

A 45-year-old patient with hyperthyroidism developed reversible dilated cardiomyopathy, which improved with timely treatment.

## Contribution

This case report adds to the understanding of hyperthyroidism-induced DCM and emphasizes early diagnosis and treatment.

## Key findings

- Hyperthyroidism-induced DCM was reversed with carbimazole and propranolol within three months.
- Early diagnosis and treatment are crucial to prevent irreversible heart damage.
- Multidisciplinary collaboration is needed for effective management of such cases.

## Abstract

Dilated cardiomyopathy (DCM) is a rare but potentially reversible complication of hyperthyroidism, often resulting from severe thyrotoxicosis, leading to ventricular dilatation and reduced systolic function. A 45-year-old patient presented with progressive dyspnea and peripheral edema. Laboratory tests and imaging confirmed hyperthyroidism-induced DCM with a reduced ejection fraction (30%). Treatment with carbimazole and propranolol resulted in the normalization of thyroid function and cardiac recovery within three months. Hyperthyroidism can induce cardiac remodeling through genomic and non-genomic mechanisms of thyroid hormones, leading to reversible DCM. Early diagnosis and management are essential to avoid long-term complications, as delayed treatment may result in irreversible myocardial damage. This case highlights the need for multidisciplinary collaboration.