**13. Conclusion**

It's important to bear in mind that significant cardiac complications of Graves' Disease (dilated cardiomyopathy, atrial fibrillation, systemic hypertension and pulmonary hypertension) may occur in previously fit young patients without cardiac disease. All these cardiac complications increase mortality and morbidity in patients with Graves' Disease. Most of the time cardiac function recovers if Graves' Disease is specifically treated and cardiac interventions are done in a timely fashion. Therefore early diagnosis and definitive treatment of hyperthyroidism is crucial for prevention of the development of thyrotoxic cardiomyopathy.
