title: Electrocardiographic differentiation of the causes of left ventricular diastolic overload.
abstract: Left ventricular hypertrophy due to diastolic overload is characterized by the following in lead V6: (a) tall R wave; (b) prominent initial Q wave; (c) minimally elevated concave-upward ST segment; and (d) relatively tall symmetrical T wave. Reciprocal deep S waves are seen in lead V1. This study reflects a further evaluation of these parameters in the four main causes of left ventricular diastolic overload: mitral incompetence, aortic incompetence, patent ductus arteriosus, and ventricular septal defect. An S wave in lead V1 which is equal to or greater than the R wave in lead V6 excludes the diagnosis of mitral incompetence.
mesh_terms: D001022:Aortic Valve Insufficiency / Q000150:complications / Q000175:diagnosis; D006332:Cardiomegaly / Q000175:diagnosis* / Q000209:etiology; D003971:Diastole; D004374:Ductus Arteriosus, Patent / Q000150:complications / Q000175:diagnosis; D004562:Electrocardiography; D006345:Heart Septal Defects, Ventricular / Q000150:complications / Q000175:diagnosis; D006801:Humans; D008944:Mitral Valve Insufficiency / Q000150:complications / Q000175:diagnosis