The training and research of clinical medical skills of extrathoracic heart is to study new surgical techniques, the use of surgical instruments, the risk assessment of surgery and postoperative care. The training and research of clinical medical skills outside chest and heart is the training and research field of clinical medical skills in chest and heart surgery, aiming at improving the surgical skills of clinicians and ensuring the safety and rehabilitation of patients after operation. Extrathoracic clinical medicine is a medical specialty, specializing in the diagnosis and treatment of chest organs, mainly including esophageal, lung and mediastinal lesions.