So, in case you had a good game use for it - maybe a spell or magic item that rapidly ages a character, or a character who has been noted as being overweight - here's the D&D stats for heart attacks, courtesy of Mark Chance of Spes Magna Games:
Awful Afflictions - "My myocardium is infarcting!"
Shortness of breath. Shooting pains. Tightness in the chest. A cold sweat and clammy skin.
Type disease; Save Fort DC 20
Onset 1 day; Frequency special (see description)
Effect 1d4 Str and 1d4 Con plus fatigue (see description); Cure 2 saves
Description A heart attack often strikes without warning. It causes loss of strength and health, and the victim is easily fatigued. Even though a heart attack can be treated via Heal as if it were a disease, it inflicts damage quickly. A new Fort save must be made every minute. The fatigue effect remains until all ability damage is healed. For a more severe heart attack, raise the damage to 1d6 or 1d8 of Str and Con damage and increase the fatigue to exhausted.