Coronary artery spasm: A spasm (a sudden constriction) of one of the coronary arteries depriving the ( myocardium (the heart muscle ) of blood and oxygen . This can cause chest pain referred to as variant (or Prinzmetal's) angina .

Coronary artery spasm can be triggered by emotional stress, medicines, street drugs (such as cocaine ) or exposure to cold .

Treatments include beta-blocker medications and, classically, nitroglycerin is prescribed to permit the coronary arteries to open up ( dilate ). Illicit drug use should be discontinued and stress reduced, if possible.

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