Blalock at English => English (The Britannica Concise) Of Explained:
U.S. surgeon. Born in Culloden, Ga., he received an MD from Johns Hopkins Univ. His research showing that traumatic and hemorrhagic shock resulted from loss of blood volume led to volume-replacement treatment, which saved countless lives during World War II. He is remembered for his development, with H. Taussig, of a surgical treatment for heart malformations in newborns. In 1944 he performed the first subclavian-pulmonary artery anastomosis operation, which corrected the birth defect.