Double-chambered Right Ventricle A Report of Five Cases

The double-chambered right ventricle is a developmental cardiac anomaly in which aberrant muscular bands obstruct the body of the right ventricle dividing it into a high-pressure proximal chamber and a low-pressure distal chamber. Grant, Downey, and MacMahon (1961) considered that the obstruction, which is situated at the start of the outflow tract adjacent to the moderator band, is caused by hypertrophy of the oblique component of the bulbar musculature. Associated congenital cardiac abnormalities have been found in 40 of 52 reported cases (Grant et al., 1961; Tsifutis, Hart