Almost. I think you're confusing "heart failure" with "myocardial infarction." They are two different diseases. Collapse during exertion can happen in either

Almost. I think you're confusing "heart failure" with "myocardial infarction." They are two different diseases. Collapse during exertion can happen in either one, but in Seth's case myocardial infarction is more likely, because people with heart failure generally don't go hiking (their exercise tolerance is too limited).