Direct study of left atrial P waves.
D000328:Adult; D006328:Cardiac Catheterization; D004558:Electric Stimulation; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology*; D006325:Heart Atria / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology; D006330:Heart Defects, Congenital / Q000175:diagnosis; D006331:Heart Diseases / Q000175:diagnosis*; D006333:Heart Failure / Q000175:diagnosis; D006801:Humans; D008297:Male; D008946:Mitral Valve Stenosis / Q000175:diagnosis; D014672:Vectorcardiography