beta blocker

beta blocker A class of drugs that block the effect of beta-adrenergic substances such as adrenaline (epinephrine), that play a key role in the sympathetic portion of the involuntary nervous system. By blocking the action of the sympathetic nervous system on the heart, they slow the heartbeat and relieve stress on the heart. Beta blockers…

Bernstein test

Bernstein test A test to find out if heartburn is caused by acid in the esophagus, and so to diagnose GERD (gastroesophageal reflux disease). The test involves dripping a mild acid, similar to stomach acid, through a tube placed in the esophagus. Also known as esophageal acid infusion test.

Bernard-Soulier syndrome

Bernard-Soulier syndrome A disorder in which the platelets crucial to normal blood clotting lack the ability to adequately stick to injured blood vessel walls, leading to abnormal bleeding. Bernard-Soulier syndrome usually appears in the newborn period, infancy, or early childhood, with bruises, nosebleeds, and gum bleeding. BernardSoulier syndrome is an inherited disease, transmitted as an…