not sure i get your questions correct... do you mean what are the potential signs that this person might get a heart attack? if that's your question, then just read here.

The classic symptom of a heart attack is intense, central chest pressure. Other common symptoms include: pain or heaviness in the left arm, nausea, shortness of breath, increased perspiration, and a feeling of impending doom. But many people who have had an MI describe chest "discomfort," or pain in the jaw, teeth, arm, or abdomen. Women are more likely than men to feel pain in their backs. Often, symptoms come on gradually and are intermittent or vague. A quarter of patients—more often women and people with diabetes—experience no symptoms at all.