title: QS complexes in right praecordial leads due to right atrial dilatation.
mesh_terms: D000328:Adult; D006332:Cardiomegaly / Q000175:diagnosis*; D004108:Dilatation, Pathologic / Q000175:diagnosis; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria; D006801:Humans