title: P WAVE CHANGES REFLECTING ATRIAL MORPHOLOGY.
mesh_terms: D000790:Angiocardiography; D006348:Cardiac Surgical Procedures; D006332:Cardiomegaly; D002648:Child; D004562:Electrocardiography; D006331:Heart Diseases; D006343:Heart Septal Defects; D006344:Heart Septal Defects, Atrial; D006801:Humans; D008944:Mitral Valve Insufficiency; D008946:Mitral Valve Stenosis; D011660:Pulmonary Heart Disease; D011666:Pulmonary Valve Stenosis; D013903:Thoracic Surgery
keywords: ANGIOCARDIOGRAPHY; CHILD; ELECTROCARDIOGRAPHY; HEART DISEASES; HEART ENLARGEMENT; HEART SEPTAL DEFECTS, ATRIAL; HEART SURGERY; MITRAL VALVE INSUFFICIENCY; MITRAL VALVE STENOSIS; PULMONARY HEART DISEASE; PULMONARY VALVE STENOSIS