https://www.nhlbi.nih.gov/health/hea...tattack/causesCoronary Artery Spasm
A less common cause of heart attack is a severe spasm (tightening) of a coronary artery. The spasm cuts off blood flow through the artery. Spasms can occur in coronary arteries that aren't affected by atherosclerosis.
What causes a coronary artery to spasm isn't always clear. A spasm may be related to:
Taking certain drugs, such as cocaine
Emotional stress or pain
Exposure to extreme cold
Posiblemente dos o tres de las causas fomentaron el paro cardíaco (drogas, estrés y dolor, posiblemente frío).