Transmediastinal gunshot wound

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A transmediastinal gunshot wound (TMGSW) is a penetrating injury to a person's thorax in which a bullet enters the mediastinum, possibly damaging some of the major structures in this area. Hemodynamic instability has been reported in about 50% of cases with a mortality rate ranging from 20 to 49$. Some studies have shown marked improvement in the mortality rate of patients who survived transfer to the operating room rather than being treated surgically in the ER.

Contents

Presentation

Complications

Complications caused by a TMGSW can range from mild to life-threatening depending on which structures are damaged. It can be rapidly lethal if a major structure is involved. Some of the possible complications caused by a TMGSW are:

Diagnosis

Stable patients

Previously, every stable patient who suffered a TMGSW received extensive evaluation that included chest radiography, oesophagography, esophagoscopy, angiography, bronchoscopy, or cardiac ultrasound. Grossman et al. found evidence that the trajectory of the bullet can be delineated with the use of computed tomographic scan (CT). Subsequently, other studies demonstrated the use of CT as a screening tool for stable patients who suffered TMGSW is a reliable tool for ruling out, diagnosing, and avoiding missed injuries. For example, Stassen et al. showed data of 22 stable patients who were screened with CT, chest X-ray and abdominal ultrasound; seven patients showed a positive CT scan and required additional evaluation, and of these seven patients, three required surgical management. [1] Additionally the work of Burack et al., [2] whose evaluation of stable patients with penetrating injuries to the mediastinum — this time including stab wounds — relied mostly on CT and ultrasound, showed similar results. The work of Ibirogba et al. did so, as well. [3] Recent data suggest that the use of CT scan with some additional noninvasive techniques, such as ultrasound and chest roentgenogram, are reliable screening tools to decide whether patients need further evaluation. [ citation needed ]

Unstable patients

The criteria to define a patient as stable or unstable could have variations from institution to institution. For example, Burack et al. used a list of six criteria in his paper that defined an unstable hemodynamic state:

  1. Traumatic cardiac arrest (asystole, course or fine ventricular fibrillation, pulseless electrical activity, or pulseless ventricular tachycardia) or near arrest (unstable ventricular tachycardia with a pulse, or bradycardia with a pulse) and an emergency department chest incision- thoracotomy [ clarification needed ]
  2. Cardiac tamponade
  3. Persistent ATLS class III shock despite fluid resuscitation (blood loss 1500–2000 mL, pulse rate greater than 120, blood pressure decreased)
  4. Chest tube output greater than 1500 mL of blood on insertion
  5. Chest tube output greater than 500 mL/hour for the initial hour
  6. Massive hemothorax after chest tube drainage

One common criteria found in literature is a sustained systolic blood pressure of less than 100 mmHg, but this can be an oversimplification. Patients with clinical evidence of possible TMGSW that are considered unstable receive no further evaluation and are taken to surgery immediately.[ citation needed ]

Management

Stable

Stable patients are evaluated with CT, ultrasound, and/or chest X-ray as the institution's protocol specifies. When this initial survey is negative, patients can be observed with conservative management. In many cases, chest tubes are required due to concomitant lesions in the pleural cavity. If possible lesions are found (for example, a missile track near the trachea or esophagus, or pneumomediastinum), further investigation follows with oesophagography, esophagoscopy, angiography, or bronchoscopy as needed to rule out or confirm such a lesion, and decide whether surgical repair is warranted.

Unstable

Unstable patients are managed by operative exploration of the mediastinum. Moribund patients go through an emergency department thoracotomy. This measure is taken because at their arrival in the emergency room, these patients are in such critical condition that they would not survive long enough to be transferred to an operating room. Outcome is very poor. Burack et al. [2] reported only 2.8% survival of such patients in his study. In a study by Van Waes et al., (which included all thoracic-penetrating injuries, not just transmediastinal) survival after emergency department thoracotomy was 25%. [4] In other circumstances the unstable patient is immediately transferred to the operating room for exploration by thoracotomy or sternotomy. Survival rate has been reported as high as 75 percent when the patient is able to reach the OR.[ citation needed ]

Related Research Articles

<span class="mw-page-title-main">Cardiac tamponade</span> Buildup of fluid around the heart

Cardiac tamponade, also known as pericardial tamponade, is a compression of the heart due to pericardial effusion. Onset may be rapid or gradual. Symptoms typically include those of obstructive shock including shortness of breath, weakness, lightheadedness, and cough. Other symptoms may relate to the underlying cause.

<span class="mw-page-title-main">Pneumothorax</span> Abnormal collection of air in the pleural space

A pneumothorax is an abnormal collection of air in the pleural space between the lung and the chest wall. Symptoms typically include sudden onset of sharp, one-sided chest pain and shortness of breath. In a minority of cases, a one-way valve is formed by an area of damaged tissue, and the amount of air in the space between chest wall and lungs increases; this is called a tension pneumothorax. This can cause a steadily worsening oxygen shortage and low blood pressure. This leads to a type of shock called obstructive shock, which can be fatal unless reversed. Very rarely, both lungs may be affected by a pneumothorax. It is often called a "collapsed lung", although that term may also refer to atelectasis.

<span class="mw-page-title-main">Internal bleeding</span> Medical condition

Internal bleeding is a loss of blood from a blood vessel that collects inside the body. Internal bleeding is usually not visible from the outside. It is a serious medical emergency but the extent of severity depends on bleeding rate and location of the bleeding. Severe internal bleeding into the chest, abdomen, retroperitoneal space, pelvis, and thighs can cause hemorrhagic shock or death if proper medical treatment is not received quickly. Internal bleeding is a medical emergency and should be treated immediately by medical professionals.

<span class="mw-page-title-main">Chest tube</span> Type of surgical drain

A chest tube is a surgical drain that is inserted through the chest wall and into the pleural space or the mediastinum in order to remove clinically undesired substances such as air (pneumothorax), excess fluid, blood (hemothorax), chyle (chylothorax) or pus (empyema) from the intrathoracic space. An intrapleural chest tube is also known as a Bülau drain or an intercostal catheter (ICC), and can either be a thin, flexible silicone tube, or a larger, semi-rigid, fenestrated plastic tube, which often involves a flutter valve or underwater seal.

<span class="mw-page-title-main">Traumatic cardiac arrest</span> Medical condition

Traumatic cardiac arrest (TCA) is a condition in which the heart has ceased to beat due to blunt or penetrating trauma, such as a stab wound to the thoracic area. It is a medical emergency which will always result in death without prompt advanced medical care. Even with prompt medical intervention, survival without neurological complications is rare. In recent years, protocols have been proposed to improve survival rate in patients with traumatic cardiac arrest, though the variable causes of this condition as well as many coexisting injuries can make these protocols difficult to standardize. Traumatic cardiac arrest is a complex form of cardiac arrest often derailing from advanced cardiac life support in the sense that the emergency team must first establish the cause of the traumatic arrest and reverse these effects, for example hypovolemia and haemorrhagic shock due to a penetrating injury.

<span class="mw-page-title-main">Mediastinum</span> Central part of the thoracic cavity

The mediastinum is the central compartment of the thoracic cavity. Surrounded by loose connective tissue, it is an undelineated region that contains a group of structures within the thorax, namely the heart and its vessels, the esophagus, the trachea, the phrenic and cardiac nerves, the thoracic duct, the thymus and the lymph nodes of the central chest.

<span class="mw-page-title-main">Hemothorax</span> Blood accumulation in the pleural cavity

A hemothorax is an accumulation of blood within the pleural cavity. The symptoms of a hemothorax may include chest pain and difficulty breathing, while the clinical signs may include reduced breath sounds on the affected side and a rapid heart rate. Hemothoraces are usually caused by an injury, but they may occur spontaneously due to cancer invading the pleural cavity, as a result of a blood clotting disorder, as an unusual manifestation of endometriosis, in response to Pneumothorax, or rarely in association with other conditions.

<span class="mw-page-title-main">Splenic injury</span> Injury to the spleen

A splenic injury, which includes a ruptured spleen, is any injury to the spleen. The rupture of a normal spleen can be caused by trauma, such as a traffic collision.

<span class="mw-page-title-main">Pericardial effusion</span> Medical condition

A pericardial effusion is an abnormal accumulation of fluid in the pericardial cavity. The pericardium is a two-part membrane surrounding the heart: the outer fibrous connective membrane and an inner two-layered serous membrane. The two layers of the serous membrane enclose the pericardial cavity between them. This pericardial space contains a small amount of pericardial fluid. The fluid is normally 15-50 mL in volume. The pericardium, specifically the pericardial fluid provides lubrication, maintains the anatomic position of the heart in the chest, and also serves as a barrier to protect the heart from infection and inflammation in adjacent tissues and organs.

<span class="mw-page-title-main">Blunt trauma</span> Physical trauma caused to a body part, either by impact, injury or physical attack

Blunt trauma, also known as blunt force trauma or non-penetrating trauma, describes a physical trauma due to a forceful impact without penetration of the body's surface. Blunt trauma occurs frequently where there is direct physical trauma or impactful force to a body part. Such incidents often occur with road traffic collisions, direct physical blows, assaults, sports-related injuries, and are notably common among the elderly who experience falls. Blunt trauma injuries can be categorized into four primary types: contusions (bruise), abrasions, lacerations, and fractures. Blunt trauma stands in contrast with penetrating trauma, which occurs when an object pierces the skin, enters body tissue, and creates an open wound.

<span class="mw-page-title-main">Chest injury</span> Medical condition

A chest injury, also known as chest trauma, is any form of physical injury to the chest including the ribs, heart and lungs. Chest injuries account for 25% of all deaths from traumatic injury. Typically chest injuries are caused by blunt mechanisms such as direct, indirect, compression, contusion, deceleration, or blasts caused by motor vehicle collisions or penetrating mechanisms such as stabbings.

<span class="mw-page-title-main">Focused assessment with sonography for trauma</span> Fluid accumulation screening

Focused assessment with sonography in trauma is a rapid bedside ultrasound examination performed by surgeons, emergency physicians, and paramedics as a screening test for blood around the heart or abdominal organs (hemoperitoneum) after trauma. There is also the extended FAST (eFAST) which includes some additional ultrasound views to assess for pneumothorax.

<span class="mw-page-title-main">Gunshot wound</span> Injury caused by a bullet

A gunshot wound (GSW) is a penetrating injury caused by a projectile from a gun. Damages may include bleeding, bone fractures, organ damage, wound infection, loss of the ability to move part of the body, and in severe cases, death. Damage depends on the part of the body hit, the path the bullet follows through the body, and the type and speed of the bullet. Long-term complications can include bowel obstruction, failure to thrive, neurogenic bladder and paralysis, recurrent cardiorespiratory distress and pneumothorax, hypoxic brain injury leading to early dementia, amputations, chronic pain and pain with light touch (hyperalgesia), deep venous thrombosis with pulmonary embolus, limb swelling and debility, and lead poisoning.

Lung cancer staging is the assessment of the extent to which a lung cancer has spread from its original source. As with most cancers, staging is an important determinant of treatment and prognosis. In general, more advanced stages of cancer are less amenable to treatment and have a worse prognosis.

<span class="mw-page-title-main">Pulmonary laceration</span> Medical condition

A pulmonary laceration is a chest injury in which lung tissue is torn or cut. An injury that is potentially more serious than pulmonary contusion, pulmonary laceration involves disruption of the architecture of the lung, while pulmonary contusion does not. Pulmonary laceration is commonly caused by penetrating trauma but may also result from forces involved in blunt trauma such as shear stress. A cavity filled with blood, air, or both can form. The injury is diagnosed when collections of air or fluid are found on a CT scan of the chest. Surgery may be required to stitch the laceration, to drain blood, or even to remove injured parts of the lung. The injury commonly heals quickly with few problems if it is given proper treatment; however it may be associated with scarring of the lung or other complications.

<span class="mw-page-title-main">Subcutaneous emphysema</span> Medical condition

Subcutaneous emphysema occurs when gas or air accumulates and seeps under the skin, where normally no gas should be present. Subcutaneous refers to the subcutaneous tissue, and emphysema refers to trapped air pockets. Since the air generally comes from the chest cavity, subcutaneous emphysema usually occurs around the upper torso, such as on the chest, neck, face, axillae and arms, where it is able to travel with little resistance along the loose connective tissue within the superficial fascia. Subcutaneous emphysema has a characteristic crackling-feel to the touch, a sensation that has been described as similar to touching warm Rice Krispies. This sensation of air under the skin is known as subcutaneous crepitation, a form of crepitus.

<span class="mw-page-title-main">Abdominal trauma</span> Medical condition

Abdominal trauma is an injury to the abdomen. Signs and symptoms include abdominal pain, tenderness, rigidity, and bruising of the external abdomen. Complications may include blood loss and infection.

<span class="mw-page-title-main">Diaphragmatic rupture</span> Tear in the thoracic diaphragm, usually caused by physical trauma

Diaphragmatic rupture is a tear of the diaphragm, the muscle across the bottom of the ribcage that plays a crucial role in breathing. Most commonly, acquired diaphragmatic tears result from physical trauma. Diaphragmatic rupture can result from blunt or penetrating trauma and occurs in about 0.5% of all people with trauma.

<span class="mw-page-title-main">Thoracic aorta injury</span> Medical condition

Injury of the thoracic aorta refers to any injury which affects the portion of the aorta which lies within the chest cavity. Injuries of the thoracic aorta are usually the result of physical trauma; however, they can also be the result of a pathological process. The main causes of this injury are deceleration and crush injuries. There are different grades to injuries to the aorta depending on the extent of injury, and the treatment whether surgical or medical depends on that grade. It is difficult to determine if a patient has a thoracic injury just by their symptoms, but through imaging and a physical exam the extent of injury can be determined. All patients with a thoracic aortic injury need to be treated either surgically with endovascular repair or open surgical repair or with medicine to keep their blood pressure and heart rate in the appropriate range. However, most patients that have a thoracic aortic injury do not live for 24 hours.

<span class="mw-page-title-main">Resuscitative thoracotomy</span> Type of thoracotomy

A resuscitative thoracotomy (sometimes referred to as an emergency department thoracotomy (EDT), 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. The procedure is rarely performed and is a procedure of last resort.

References

  1. Stassen, Nicole A.; Lukan, James K.; Spain, David A.; et al. (2002). "Re-evaluation of diagnostic procedures for transmediastinal gunshot wounds". The Journal of Trauma: Injury, Infection, and Critical Care. 53 (4): 635–638. doi:10.1097/00005373-200210000-00003. PMID   12394859.
  2. 1 2 Burack, J.; Emad, K.; Sawas, A.; et al. (2007). "Triage and Outcome of Patients with Mediastinal Penetrating Trauma". Annals of Thoracic Surgery. 83 (2): 377–382. doi:10.1016/j.athoracsur.2006.05.107. PMID   17257952.
  3. Ibirogba, Sheriff; Nicol, Andrew J.; Navsaria, Pradeep H.; et al. (2007). "Screening helical computed tomographic scanning in haemodynamic stable patients with transmediastinal gunshot wounds". Injury, Int. J. Care Injured. 38 (1): 48–52. doi:10.1016/j.injury.2006.07.039. PMID   17054956.
  4. Van Waes, OJ; Van Riet, PA; Van Lieshout, EM; Hartoq, DD (October 2012). "Immediate thoracotomy for penetrating injuries: ten years' experience at a Dutch level I trauma center". Eur J Trauma Emerg Surgery. 38 (5): 543–551. doi:10.1007/s00068-012-0198-6. PMC   3495272 . PMID   23162671.
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