title: Intraventricular conduction delay as a determinant of atrial echo beats.
mesh_terms: D000328:Adult; D000368:Aged; D004562:Electrocardiography; D006325:Heart Atria; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013614:Tachycardia, Paroxysmal / Q000503:physiopathology*; D013997:Time Factors