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Vasospasm-- Narrowing of a blood vessel caused by a spasm of the smooth muscle of the vessel wall.
papaverine
Sudden contraction of the smooth muscle of a blood vessel is vasospasm. It can be due to body response to hemorrhage or as an effect of drugs.
Coronary Vasospasm can cause Ischemic heart disease (prinzmetal angina) or even MI
Serotonin to continue the vasospasm.
The term means a tightening of a blood vessel. Vaso-=vessel + spasm=constriction. The root of the word is vaso-