Marfan's syndrome is a common connective tissue disease with different 
musculoskeletal, ophthalmic and cardiac manifestations. Marfan's patients carry 
increased risk for cardiac arrhythmias. Only three cases of atrial flutter in 
Marfan's patients are described in the literature. We report a fourth case of a 
young Marfan's patient who presents with typical atrial flutter after motor 
vehicle accident. After electrical cardioversion, sinus rhythm was restored but 
he had recurrent atrial flutter on follow up. The patient then underwent 
electrophysiological study and successful radiofrequency catheter ablation of 
the flutter circuit. Since discharge, the patient has had no documented 
arrhythmias on follow up.