1. Gray, I. R. (1954). Brit. Heart J., 16, 165.
2. Roseman, M. D., and Wasserman, E. (1951). New Engl. J. Med., 245, 450.
3. Obeyesekere, I., Dulake, M., Demerdash, H., and Hollister, R. (1965). Brit. Heart_J., 27, 945.
4. Between 1958 and 1967, 33 children with ventricular septal defects and pulmonary vascular disease have been surgically treated at the Royal Postgraduate Medical School. Before operation these children had balanced systolic pressure in both ventricles, a left-to-right shunt, minimal or no right-to-left shunt
5. Donald Morphine is the most widely used drug for the relief of pain in myocardial infarction. Shillingford and his colleagues have shown that morphine may have adverse circulatory;effects (Thomas et al.,,1965