A resuscitative thoracotomy (sometimes referred to as an emergency department thoracotomy, trauma thoracotomy or, colloquially, as "cracking the chest") is a thoracotomy performed to resuscitate a major trauma patient who has sustained severe thoracic or abdominal trauma and who has entered cardiac arrest because of this.The procedure allows immediate direct access to the thoracic cavity, permitting rescuers to control hemorrhage, relieve cardiac tamponade, repair or control major injuries to the heart, lungs or thoracic vasculature, and perform direct cardiac massage or defibrillation. For most persons with thoracic trauma the procedure is not necessary; only 15% of those with thoracic injury require the procedure.