RT Journal Article SR Electronic T1 Transient asymmetric ventricular septal hypertrophy in the newborn unassociated with maternal diabetes. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 228 OP 229 DO 10.1136/hrt.52.2.228 VO 52 IS 2 A1 Cecchi, F A1 Zuppiroli, A A1 Manetti, A YR 1984 UL http://heart.bmj.com/content/52/2/228.abstract AB Severe hypertrophy of the interventricular septum was found by echocardiography in a 15 day old infant without symptoms whose mother was not diabetic. The electrocardiogram showed pronounced intraventricular conduction disturbances. Both echocardiographic and electrocardiographic findings showed no abnormality after 27 months, the explanation for which could be the spontaneous regression of an intracardiac rhabdomyoma.