This document discusses the history of resuscitative thoracotomy. It outlines several important milestones in the development of the procedure, including the first successful cardiac repair after a knife wound in 1896, the first open cardiac massage for cardiac arrest in 1901, and increased use of resuscitative thoracotomy during World War II to remove missiles from the heart. The document also reviews several studies from the 1960s that helped establish guidelines for use of resuscitative thoracotomy in unstable patients with cardiac injuries.