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(American Cardiothoracic Surgeon Best Known for His Work in Pioneering Cardiopulmonary Bypass (CPB)) Though born to a surgeon father, Clarence Dennis had initially aspired to be an engineer. He, nevertheless, chose medicine and later revolutionized medical science by being the first person to use a heart-lung machine successfully. He also pioneered the use of cardiopulmonary bypass to treat victims of heart attacks.
