Peter Allen (physician)
Peter Allen was a Canadian surgeon who played a leading role in improving cardiac surgery techniques. Along with Dr. Philip Ashmore, Dr. W.G. Trapp and Dr. Ross Robertson, he performed the first Open Heart Surgery in British Columbia onOctober 1957 at Vancouver General Hospital, by closing an Atrial Septal Defect inyear old John Evans, using Cardiopulmonary Bypass .
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Source: Wikipedia