%0 Journal Article %A R M Freedom %A R S Fowler %A W J Duncan %T Rapid evolution from "normal" left ventricular outflow tract to fatal subaortic stenosis in infancy. %D 1981 %R 10.1136/hrt.45.5.605 %J British Heart Journal %P 605-609 %V 45 %N 5 %X Serial clinical, echocardiographic, haemodynamic, and angiocardiographic data support the conclusion that over four months severe discrete subaortic stenosis evolved from a previously angiocardiographically normal left ventricular outflow tract in an infant who had a successful repair of thoracic aortic coarctation. This case supports those who suggest that a myocardial factor may play an important role in the change in form and function of some congenitally malformed hearts. %U https://heart.bmj.com/content/heartjnl/45/5/605.full.pdf