Unfortunately, in severe conditions, it can result in severe congestive heart failure or even
in a cordae rupture (which is when the heart valve tears resulting
in sudden
death or severe congenstivei heart failure - where fluid builds up in the lungs). If there was blood on the carpet, it may have been from his lungs, but it's hard to tell without doing an autopsy. A sudden heart arrhythmia (abnormal heart rhythm) may also have caused his sudden death.