capture /kap″chər/ , 1. the catching and holding of a nuclear particle, as an electron, or an electrical impulse originating elsewhere. 2. (in cardiology) the capture of control of the atria or ventricles after a period of independent beating caused by ectopic beats or an atrioventricular block. 3. (in cardiology) the ability of a pacemaker to electrically stimulate a cardiac chamber.
