Medical Definitions - V

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Vasodilator - an agent, such as a nerve or hormone, that widens the blood vessels, which in turn decreases resistance to blood flow and lowers blood pressure.

Vein - a blood vessel that carries unoxygenated blood to the lungs from the body's other organs.

Vecuronium - generic name of the drug Norcuron; medication used to produce muscle relaxation during surgery and assisted breathing (mechanical ventilation).

Vesicoureteral reflux (VUR) - a condition in which urine flows from the bladder, back up the ureter, and back into the kidneys.

Viagra - brand name of the drug Sidenafil; reduces the pressure in the pulmonary artery in pulmonary arterial hypertension.