title: [P wave (loop) and Ta wave (loop)].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016275:Atrial Function; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D014672:Vectorcardiography