title: The frequency of mitral valve prolapse in electrocardiographic disturbances of unknown origin.
mesh_terms: D000293:Adolescent; D001145:Arrhythmias, Cardiac / Q000209:etiology; D002648:Child; D002675:Child, Preschool; D004452:Echocardiography; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008945:Mitral Valve Prolapse / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology