| vasospasm | The sudden decrease in the internal diameter of a blood vessel that results from contraction of smooth muscle within the wall of the vessel. This causes a decrease in blood flow, but an increase in systemic vascular resistance. Synonym: vasospasm. (27 Sep 1997) |
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| coronary vasospasm | Spasm of the large- or medium-sized coronary arteries. (12 Dec 1998) |
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