The ambulance sped down the Denver highway carrying Mr. Rosnes Avon to the hospital. The flashing lights illuminated the darkness of the night, and the siren alerted those drivers who braved the icy cold weather. Mrs. Avon's voice was clearly shaking as she placed the emergency telephone call a few minutes earlier. Her husband was complaining of severe heart palpitations and shortness of breath. She sat next to him in the rear of the ambulance and held his hand in silence, but her eyes could not