A 75-year-old man with sudden crushing chest pain was in the back of an ambulance when the cardiac monitor caught him going into ventricular tachycardia. Intravenous amiodarone had been drawn up and was about to be administered. Then the ambulance crossed a speed bump at 5 miles per hour, and the jolt put him back into sinus rhythm before the drug did. His only recollection of the journey was how bumpy the ride had been.
