title: Effect of loss of the atrial contribution to ventricular filling on left ventricular function in patients requiring intermittent pacing with ventricular demand pacemakers.
mesh_terms: D000368:Aged; D005260:Female; D006327:Heart Block / Q000628:therapy; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial; D012804:Sick Sinus Syndrome / Q000628:therapy