It was an unusually cold spring day in April when the patient came to the emergency room at our University Hospital in Toronto. She felt nauseous, she complained of circulatory problems, her skin itched and was red. We quickly found out that her pulse was much too fast at 120 beats per minute, while her blood pressure was much too low. She also had difficulty breathing and soon began to complain of chest pains. A colleague of mine excitedly called me because her electrocardiogram (ECG) didn't match the patient at all. She was in her twenties, slim and had no previous illnesses. But her EKG showed typical signs of a heart attack!

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