A 23-year-old man is brought to the emergency department after he collapsed while climbing stairs and is pronounced dead on arrival. One week ago he was seen losing consciousness while playing soccer. Examination at the time showed an S4 heart sound and a 2/6 systolic murmur. Which of the following is the most likely cause of death in this patient?
Cardiac tamponade
Dissection
Myocardial infarction
Reentrant supraventricular tachycardia
Ventricular fibrillation
