Clinical practice guideline: penetrating zone II neck trauma.

STATEMENT OF THE PROBLEM Penetrating wounds of the neck are common in the civilian trauma population. Risk of significant injury to vital structures in the neck is dependent on the penetrating object. For gunshot wounds, approximately 50% (higher with high velocity weapons) of victims have significant injuries, whereas this risk may be only 10% to 20% with stab wounds. The management of injuries to the neck that penetrate the platysma is dependent on the anatomic level of injury. The neck has been divided into threes zones. Zone I, including the thoracic inlet, up to the level of the cricothyroid membrane, is treated as an upper thoracic injury. Zone III, above the angle of the mandible, is treated as a head injury. Zone II, between zones I and III, is the area of controversy. Because of the density of vital structures in this zone, multiple injuries are common and can affect length of stay. Mortality, particularly for major vascular injuries may reach 50%. Delayed complications such as pseudoaneurysms or arteriovenous fistulae can affect long-term outcomes. Appropriate and timely management of these injuries is critical. For the patients with hard signs of significant injury, including active hemorrhage, expanding hematoma, bruit, pulse deficit, subcutaneous emphysema, hoarseness, stridor, respiratory distress, or hemiparesis, immediate operative management may be indicated. Controversy arises over management of the patient without significant symptoms. The management of these patients has been evolving from an era of mandatory exploration to an era of more selective management. Mandatory exploration, while seemingly safe and conservative, led to many nontherapeutic operations. This fact, along with advances in technology, such as high resolution computed tomography (CT), may eliminate the need to explore the neck to determine whether there are injuries. Also during the time that technology had been advancing, many reports have documented the safety of selective management of neck injuries that penetrate the platysma. This experience has demonstrated that physical examination may be reliable and that not all injuries to vital structures in the neck need surgical intervention for repair. This guideline was therefore initiated to examine the specific roles of mandatory exploration versus selective management based on physical examination and current imaging technologies for penetrating neck trauma.