Abstract
Hyperthyroidism represents a state of hypercoagulability and hypofibrinolysis, which predisposes an individual to the increased risk of thromboembolism. We present a case of a 25-year-old patient presenting with an acute myocardial infarction secondary to plaque rupture with thrombotic occlusion of proximal left anterior descending artery, in a patient known to have Graves' disease. She had a sudden ventricular fibrillation arrest and a precordial thump given and cardiopulmonary resuscitation started. She successfully underwent cardiac catheterisation. Subsequent thyroid function tests showed she was in active thyrotoxicosis.