[Left ventricular performance in patients with artificial pacemakers estimated by echocardiography].
D000368:Aged; D004452:Echocardiography; D006331:Heart Diseases / Q000503:physiopathology; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D010138:Pacemaker, Artificial