It’s 3:00 a.m., and you’ve just arrived at the home of a woman in her early 70s. She told the dispatcher that her husband was feeling a bit of discomfort in his chest and got up to go to the bathroom several minutes ago. She heard him fall in the hallway and found him unresponsive. You’re informed that he has a history of high blood pressure and has been a smoker for over 50 years, alerting you to the possibility he had a heart attack.