question: I just saw a guy about 75 years old have a huge problem. I was at the food court of a shopping centre when I noticed this guy look up in his chair with his mouth open. I called the emergency number. he was unresponsive almost as soon as he sat down, as I was giving him some first aid (CPR) he vomited. so two questions. is the vomiting a sign that he will be alright and how long can it take for a severe heart attack to kill someone.