title: [Influence of atrial contraction on stroke volume in pacemaker stimulation].
abstract: The contribution of the atrial systole to the stroke volume was studied in 12 patients with implanted pacemakers by means of impedance-cardiography. P-ST-intervals between 70 and 200 msec. increased the stroke volume as compared with systoles without preceding P-waves. A maximal stroke volume was observed with a P-ST-interval of 130 msec. The increase of the stroke volume by 33% justifies the application of atrial triggered pacemakers in selected cases, mainly in younger patients despite of the technical limitations of these pacemaker systems.
mesh_terms: D000368:Aged; D002302:Cardiac Output; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria; D006327:Heart Block / Q000628:therapy; D006801:Humans; D008297:Male; D008433:Mathematics; D008875:Middle Aged; D009200:Myocardial Contraction; D010138:Pacemaker, Artificial; D010701:Phonocardiography
vernacular_title: Der Einfluss der Vorhofkontraktion auf das Schlagvolumen bei Schrittmacherstimulation