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Thoracic surgery, the field in which James Jude specialized, involves the surgical treatment of conditions affecting the chest cavity, including the lungs, heart, esophagus, and other thoracic organs. This specialty requires advanced surgical skills and a deep understanding of cardiothoracic anatomy and physiology. Jude's expertise in this field contributed significantly to the development of cardiopulmonary resuscitation (CPR) and other life-saving techniques.