Investigation of atrial aberration as a cause of altered P wave contour.
D000818:Animals; D001145:Arrhythmias, Cardiac / Q000503:physiopathology; D004285:Dogs; D004558:Electric Stimulation; D004562:Electrocardiography; D006321:Heart / Q000502:physiology* / Q000503:physiopathology; D006325:Heart Atria; D006327:Heart Block / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology; D008722:Methods