venospasm

ve·no·spasm

(vē'nō-spasm)
Sudden constriction of a vein.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

venospasm

(vē′nō-spăzm) [″ + Gr. spasmos, a convulsion]
Contraction of a vein, which may follow infusion of a cold or irritating substance into the vein.
Medical Dictionary, © 2009 Farlex and Partners
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The diagnostic studies which employ contrast media were examined due to the potential, although rare or remote, in causing red cell clumping and agglutination, venospasm and thrombophlebitis.
Because this is generally due to severe venospasm, the catheter must be removed and another site cleansed and prepped for a second venipuncture.
Venospasm [right arrow] Delay threading a few moments