The importance of the contribution and timing of left atrial systole.
D000368:Aged; D001146:Arrhythmia, Sinus; D003327:Coronary Disease / Q000150:complications*; D004562:Electrocardiography; D005260:Female; D006327:Heart Block; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial