 The two main groups being evaluated are: 1 eligible patients who received thoracic epidural within 48 hours of injury and 2 eligible patients who did not receive thoracic epidural within 48 hours of injury. In both retrospective and prospective approaches, the investigators will identify patients with blunt thoracic trauma who were eligible for thoracic epidural placement and received the treatment as well as those patients who were eligible but did not receive it. Hospital data such as ventilator days, ICU days, hospital days, hospital charges, and complications, etc. will be recorded. 