title: [Influence of left ventricular volume changes induced by Valsalva maneuver on R wave amplitude (author's transl)].
abstract: Exercise-induced changes of R wave amplitude (delta R) during exercise has been employed to improve the reliability of stress testing in detecting patients with coronary artery disease. Several authors postulated that delta R are related to changes of ventricular volumes. Furthermore Valsalva Maneuver (VM) is able to induce a decrease of left ventricular volumes induced by VM and the variations of R wave. Echocardiographic method was used to determine left ventricular volumes and R wave amplitude changes were evaluated by Frank's lead. Our findings suggest that R wave amplitude changes are not related to variations of cardiac volume. Electrophysiological mechanisms of delta R need further investigation.
mesh_terms: D000293:Adolescent; D000328:Adult; D002306:Cardiac Volume; D003327:Coronary Disease / Q000175:diagnosis*; D004452:Echocardiography; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006321:Heart / Q000502:physiology*; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D014636:Valsalva Maneuver
vernacular_title: Influenza delle variazioni del volume ventricolare sinistro indotte dalla manovra di Valsalva sull'ampiezza dell'onda R.