Abnormal position of the cleft of the anterior leaflet of the mitral valve in atrio-ventricular canal defects
by Mohammed Ayman Abdelhay, MD, PhD; Hoda Shehata, MD
Cardiology Department, Alexandria School of Medicine, Alexandria, Egypt.
In patients with atrio-ventricular canal defects there is a counterclockwise rotation of the papillary muscles determining a different position of the cleft compared with patients with isolated mitral cleft (drawing on the right). In patients with isolated cleft of the anterior mitral leaflet, the usual site of the cleft is towards left ventricular outflow tract, at 11 o’clock (top left panel). Whereas, in patients with atrio-ventricular canal defects, the cleft is located towards the interventricular septum (bottom left panel).