Definition and epidemiology
A gunshot wound results from the discharge of a projectile from a firearm that penetrates or perforates body tissues. GSWs are classified by mechanism into low-velocity (<1000 ft/sec, most handguns) and high-velocity (>2000 ft/sec, rifles) injuries, with shotgun wounds representing a distinct category due to multiple projectiles and variable spread patterns.
GSWs represent a significant public health burden, particularly in the United States. Approximately 30,000-40,000 firearm-related deaths occur annually in the US, with roughly 40% being homicides and the remainder suicides and accidents. GSWs are the leading cause of death in young adult males aged 15-34 in urban areas. The case-fatality rate varies widely by anatomic location: head wounds carry 90% mortality, thoracic wounds 25%, and abdominal wounds 10-15%. Globally, firearm injuries account for an estimated 250,000 deaths annually, with the highest rates in Central and South America. Approximately 2-3 GSW patients survive for every fatality, creating a substantial burden of disability and long-term morbidity.
- High-velocity bullets cause extensive tissue damage through temporary cavitation, unlike low-velocity projectiles that injure primarily by direct crushing.
- Emergency department thoracotomy is indicated for penetrating thoracic trauma with witnessed loss of vital signs or signs of life within 15 minutes.
- The lethal triad of trauma is hypothermia, acidosis, and coagulopathy; damage control surgery and resuscitation aim to prevent or reverse this.
- FAST exam has 85-95% sensitivity for hemoperitoneum but may miss hollow viscus injury, diaphragm injury, and retroperitoneal hemorrhage.
- In unstable penetrating chest trauma with diminished breath sounds, decompress the pleural space with a chest tube before any further transfer or operative decision.
- Tension pneumothorax presents with tracheal deviation, absent breath sounds, hypotension, and distended neck veins; treat immediately with needle decompression or chest tube.
- Beck's triad (hypotension, jugular venous distention, muffled heart sounds) indicates cardiac tamponade requiring immediate pericardiocentesis or surgical drainage.
- Selective non-operative management is appropriate for hemodynamically stable patients with solid organ injury and no peritoneal signs, with success rates of 80-90%.
Etiology and risk factors
GSWs result from interpersonal violence, self-inflicted injury, or unintentional discharge. The ballistic characteristics of the firearm and ammunition determine injury patterns.
Weapon characteristics:
- Low-velocity firearms (most handguns): Cause tissue damage primarily along the projectile path through crushing and laceration
- High-velocity firearms (military rifles, hunting rifles): Create temporary cavitation that damages tissues remote from the bullet tract
- Shotguns: Produce multiple projectile wounds with tissue damage proportional to range; close-range blasts (<3 meters) cause massive tissue destruction
Risk factors for GSW:
- Young age (15-34 years)
- Male sex (85-90% of victims)
- Urban residence in high-crime areas
- Gang involvement or criminal activity
- Substance abuse (alcohol, illicit drugs)
- Previous violent injury
- Access to firearms in the home (particularly for self-inflicted injuries)
- Domestic violence situations
- Mental health disorders (suicide risk)
- Socioeconomic disadvantage
The circumstances (assault, suicide attempt, accidental) significantly affect injury patterns, with suicide attempts typically involving the head, and assaults more commonly affecting the torso and extremities.
Pathophysiology
GSW pathophysiology involves both direct tissue destruction and secondary injury from energy transfer.
Mechanisms of tissue injury:
Direct tissue destruction
The projectile crushes and lacerates tissues in its path, creating a permanent cavity. The amount of tissue destroyed depends on the projectile's mass, velocity, and deformation characteristics. Hollow-point and fragmenting bullets cause more extensive wounds than full-metal-jacket ammunition.
Temporary cavitation
High-velocity projectiles transfer kinetic energy to tissues, creating a temporary cavity that can be 10-30 times the projectile diameter. This cavity expands and collapses within milliseconds, stretching and tearing tissues. Elastic tissues (muscle, lung) tolerate cavitation better than inelastic organs (liver, brain, bone).
Shock wave effects
A pressure wave precedes the projectile, though its clinical significance is debated. In fluid-filled organs and the brain, pressure waves may contribute to injury.
Secondary projectiles
Bone fragments, teeth, or bullet fragments act as secondary missiles, extending the injury zone.
Organ-specific pathophysiology:
- Cardiovascular: Direct cardiac or great vessel injury causes rapid exsanguination; pericardial wounds may cause tamponade
- Pulmonary: Pneumothorax, hemothorax, and pulmonary contusion; air embolism is rare but catastrophic
- Abdominal: Hollow viscus perforation leads to peritonitis; solid organ injury causes hemorrhage
- Neurologic: Brain injury from direct trauma, elevated intracranial pressure, and secondary ischemia; spinal cord transection or contusion
- Vascular: Hemorrhage, pseudoaneurysm formation, arteriovenous fistula, distal ischemia
- Musculoskeletal: Fractures, compartment syndrome, nerve injury
The body's hemostatic response is often overwhelmed, leading to hemorrhagic shock. The lethal triad of hypothermia, acidosis, and coagulopathy develops rapidly in severely injured patients.
Clinical features
GSW presentation varies dramatically based on anatomic location, number of wounds, and time elapsed since injury.
General findings:
- Entry wound: typically smaller, may have abrasion collar and powder burns if close-range
- Exit wound: usually larger and more irregular (if present)
- Hemorrhage: external bleeding and signs of internal hemorrhage
- Shock: tachycardia, hypotension, altered mental status, cool extremities
- Pain (unless neurologic injury or severe shock)
Location-specific presentations:
Head and neck
- Altered mental status or coma
- Focal neurologic deficits
- Seizures
- Airway compromise from neck wounds
- Expanding neck hematoma
- Hemoptysis or air bubbling from neck wounds
- Cranial nerve deficits
Thoracic
- Dyspnea, tachypnea, hypoxia
- Diminished breath sounds (pneumothorax/hemothorax)
- Subcutaneous emphysema
- Cardiac tamponade: Beck's triad (hypotension, jugular venous distention, muffled heart sounds)
- Mediastinal injury signs: persistent hypotension despite resuscitation
Abdominal
- Peritoneal signs: guarding, rigidity, rebound tenderness
- Abdominal distention
- Evisceration (rare)
- Blood at rectum or urinary meatus
- Flank ecchymosis
Extremity
- Obvious deformity or fracture
- Neurovascular compromise: absent pulses, pallor, paresthesias, paralysis, pain (the "5 Ps")
- Compartment syndrome: pain out of proportion, pain with passive stretch, tense compartment
- Active hemorrhage from wound
Trajectory considerations: The relationship between entry and exit wounds suggests projectile path, but bullets often take unpredictable courses after striking bone or dense tissue.
Diagnosis
GSW diagnosis is clinical, based on history and physical examination. Imaging and adjunctive studies determine injury extent and guide management.
Initial assessment (ATLS protocol):
Primary survey
- Airway: Assess patency, secure if needed (intubation for altered mental status, airway injury)
- Breathing: Inspect, auscultate; needle decompression or chest tube for tension pneumothorax
- Circulation: Control external hemorrhage, establish large-bore IV access, fluid resuscitation
- Disability: Glasgow Coma Scale, pupillary exam
- Exposure: Complete undressing to identify all wounds; count entry/exit wounds
Secondary survey
Systematic head-to-toe examination for additional injuries
Laboratory studies:
- Complete blood count (baseline hemoglobin, platelet count)
- Type and crossmatch (anticipate massive transfusion)
- Basic metabolic panel
- Coagulation studies (PT, PTT, INR)
- Lactate (tissue perfusion marker)
- Arterial blood gas (in respiratory compromise)
- Toxicology screen (frequently positive)
- Pregnancy test in women of childbearing age
Imaging:
Chest and pelvis radiographs
Initial screening for pneumothorax, hemothorax, free air, pelvic fractures, and bullet location
Focused Assessment with Sonography for Trauma (FAST)
Rapidly detects free intraperitoneal or pericardial fluid at the bedside; sensitivity 85-95% for hemoperitoneum
Computed tomography (CT)
- CT angiography: First-line for hemodynamically stable patients with thoracic, abdominal, or vascular concerns; defines trajectory, identifies solid organ injury, vascular injury
- Head CT: All patients with cranial GSW or altered mental status
- CT chest/abdomen/pelvis: Stable patients with torso wounds to determine need for surgery
Conventional angiography
For suspected vascular injury requiring endovascular intervention; therapeutic as well as diagnostic
Diagnostic peritoneal lavage/aspirate (DPL)
Rarely used; may be helpful when FAST equivocal and CT unavailable
Special considerations:
- Chest decompression before further workup: In penetrating chest trauma with instability and diminished breath sounds, tube thoracostomy to exclude or treat tension pneumothorax/hemothorax precedes any transfer for imaging or surgery
- Operative exploration without imaging: Hemodynamically unstable patients with torso GSW proceed directly to the operating room once immediately life-threatening thoracic pathology has been addressed
- Wound exploration: Local wound exploration under sterile conditions can determine peritoneal, pleural, or deep tissue penetration in tangential wounds
- Trajectory assessment: Three-dimensional CT reconstruction helps predict injured structures
Differential diagnosis
The diagnosis of GSW is usually evident from history and physical examination. Differential considerations arise when the mechanism is unclear or when differentiating GSW from other trauma types.
Other penetrating trauma:
- Stab wound: Single penetrating tract without cavitation; lower energy transfer
- Impalement injury: Object remains in situ; trajectory more predictable
- Shrapnel injury: Multiple small foreign bodies from explosion; may have blast injury component
Blunt trauma mimicking GSW:
- Severe blunt trauma with overlying skin laceration may be confused with entry wound
- Motor vehicle collision with high-energy transfer can produce similar organ injury patterns
Self-inflicted vs. assault: Forensic distinction based on wound characteristics, trajectory, powder residue, and circumstances; medical management is identical
Exit vs. entrance wound confusion:
- Atypical entrance wounds: Shored wounds (against hard surface) or contact wounds may appear larger
- Atypical exit wounds: Exit through supported area or after losing velocity may appear smaller
- Clinical significance: Misidentification affects trajectory assessment but not acute management
Considerations when mechanism unclear:
- Child abuse: May be falsely attributed to accident
- Suicide vs. homicide: Forensic concern; wound location and trajectory provide clues
- Accidental discharge: Usually single wound, patient may be unaware initially
When penetrating trauma is present but no projectile is visualized on imaging, consider that the bullet exited or fragmented, or that a radiolucent object (wood, plastic) caused injury.
Management
GSW management follows trauma protocols with emphasis on rapid hemorrhage control and definitive surgical intervention when indicated.
Prehospital care:
- Direct pressure for external hemorrhage
- Tourniquet for uncontrolled extremity bleeding
- Occlusive dressing for sucking chest wounds
- Rapid transport to designated trauma center (scoop and run, not stay and play)
- Notification allows trauma team activation
Emergency department resuscitation:
Hemodynamically unstable patients
- Aggressive volume resuscitation: crystalloid boluses, transition rapidly to blood products
- Massive transfusion protocol: balanced 1:1:1 ratio of packed red blood cells, fresh frozen plasma, platelets
- Tranexamic acid within 3 hours of injury
- Permissive hypotension (target systolic 80-90 mmHg) until hemorrhage controlled, except in traumatic brain injury
- Immediate chest decompression (needle decompression or tube thoracostomy) for penetrating chest trauma with instability, diminished breath sounds, or suspected tension pneumothorax, performed before transfer to the operating room
- Emergency department thoracotomy for: penetrating thoracic trauma with witnessed loss of vital signs or profound shock
- Damage control resuscitation principles: avoid hypothermia, acidosis, coagulopathy
Hemodynamically stable patients
- Supplemental oxygen
- Judicious crystalloid resuscitation
- Pain control
- Imaging as outlined above
- Tetanus prophylaxis
- Antibiotic prophylaxis for contaminated wounds
Surgical indications:
Immediate operative exploration
- Hemodynamic instability despite resuscitation and chest decompression where indicated
- Peritoneal signs on abdominal examination
- Free air under diaphragm
- Evisceration
- Transmediastinal trajectory with hemodynamic instability
- Expanding or pulsatile hematoma
Selective non-operative management
Stable patients with solid organ injury (liver, spleen, kidney) without peritoneal signs may be observed with serial examinations and hemoglobin monitoring; non-operative management is successful in 80-90% of selected cases
Location-specific management:
Head
- Immediate neurosurgical consultation
- ICP monitoring and management in salvageable injuries
- Debridement, hematoma evacuation, dural repair
- Decompressive craniectomy if indicated
- Many severe cranial GSWs are non-survivable
Neck
Zone-based approach or CT angiography-based approach; operative exploration for expanding hematoma, vascular injury, aerodigestive injury
Thoracic
- Tube thoracostomy for hemothorax/pneumothorax; this is the critical first step in any unstable penetrating chest wound with diminished breath sounds before considering the operating room
- Thoracotomy for: >1500 mL immediate chest tube output, >200 mL/hr ongoing bleeding, cardiac injury, or persistent instability after decompression
- Video-assisted thoracoscopic surgery (VATS) for stable patients with retained hemothorax
Abdominal
- Laparotomy for indications listed above
- Damage control surgery in unstable patients: control hemorrhage, control contamination, temporary closure, resuscitate in ICU, return for definitive repair
Extremity
- Vascular repair or bypass for arterial injury
- Fasciotomy for compartment syndrome or prolonged ischemia time
- Fracture stabilization
- Nerve repair (delayed if needed)
- Soft tissue debridement; wounds left open with delayed primary closure
Post-operative/critical care:
- Intensive care monitoring
- Serial hemoglobin checks
- Re-imaging if clinical deterioration
- Damage control surgery patients: correction of hypothermia, acidosis, coagulopathy before planned return to OR
- Venous thromboembolism prophylaxis when safe
- Early enteral nutrition
- Physical therapy and rehabilitation
Antibiotic therapy: Broad-spectrum antibiotics for penetrating abdominal trauma and grossly contaminated wounds; duration typically 24 hours unless infection develops
Wound care: GSW wounds are contaminated; formal debridement in the OR for extensive wounds, delayed primary closure or healing by secondary intention
Complications and prognosis
GSW outcomes depend on injury location, severity, and rapidity of treatment. Mortality ranges from <5% for isolated extremity wounds to >90% for severe head injuries.
Immediate complications:
- Exsanguination: Leading cause of preventable trauma death
- Tension pneumothorax: Immediately life-threatening if unrecognized
- Cardiac tamponade: Rapidly fatal without pericardiocentesis or pericardial window
- Air embolism: Occurs with pulmonary vein injury and positive pressure ventilation
- Hemorrhagic shock: Leads to multi-organ hypoperfusion
- Traumatic brain injury: Primary injury and secondary injury from elevated ICP
Early complications (hours to days):
- Acute respiratory distress syndrome (ARDS): Develops in 20-40% of severely injured patients
- Infection: Wound infection, pneumonia, intra-abdominal abscess
- Missed injuries: Hollow viscus perforation, diaphragm injury, pancreatic injury may present late
- Abdominal compartment syndrome: From massive resuscitation and intra-abdominal bleeding
- Compartment syndrome: Extremity or truncal compartments
- Coagulopathy: From massive transfusion, hypothermia, acidosis
- Acute kidney injury: From shock, rhabdomyolysis, or direct renal injury
Late complications (weeks to months):
- Lead toxicity: Rare; bullets retained in joints or bone may erode and release lead
- Pseudoaneurysm: Presents with pulsatile mass, bleeding, or distal embolization
- Arteriovenous fistula: May cause high-output heart failure if large
- Chronic pain: Neuropathic pain from nerve injury
- Infection: Osteomyelitis, retained foreign body abscess
- Fistula formation: Enterocutaneous, vascular, bronchial
- Bowel obstruction: From adhesions after abdominal injury
Long-term complications:
- Permanent neurologic deficit: Paralysis, sensory loss, cognitive impairment from brain or spinal cord injury
- Chronic kidney disease: From nephrectomy or renal injury
- Post-traumatic stress disorder (PTSD): Occurs in 20-40% of survivors
- Disability and loss of function: Limb amputation, chronic pain, limited mobility
- Chronic infection: Osteomyelitis, retained foreign body infection
- Seizure disorder: Following penetrating brain injury
Prognostic factors:
Favorable:
- Extremity injury only
- Hemodynamic stability on arrival
- Absence of head injury
- Rapid transport to trauma center
- Single wound
- Low-velocity mechanism
Unfavorable:
- Glasgow Coma Scale <8
- Systolic blood pressure <70 mmHg
- Injury to multiple body cavities
- Great vessel or cardiac injury
- High-velocity rifle wound
- Age >55 years
- Arrival without vital signs
Overall outcomes: Approximately 70-85% of patients reaching the hospital alive survive to discharge. Long-term disability is common, with 30-50% experiencing persistent physical or psychological impairment. Return to work rates vary from 40-70% depending on injury severity and pre-injury employment. Recidivism (repeat violent injury) occurs in 20-40% of urban GSW survivors within 5 years.
AVPU for disability assessment in primary survey: Alert, responds to Voice, responds to Pain, Unresponsive. 5 P's of vascular injury: Pain, Pallor, Pulselessness, Paresthesias, Paralysis.
Practice questions
1. A 24-year-old man is brought to the emergency department by ambulance 20 minutes after sustaining a gunshot wound to the left chest. On arrival, he is pale and diaphoretic. His temperature is 36.2°C (97.2°F), pulse is 130/min, respirations are 28/min, and blood pressure is 85/60 mm Hg. Examination shows an entrance wound in the left 5th intercostal space at the midclavicular line with no exit wound. Breath sounds are diminished on the left. Despite intravenous fluid resuscitation with 2 L of crystalloid, his blood pressure remains 80/55 mm Hg. Which of the following is the most appropriate next step in management?
2. A 32-year-old woman is brought to the emergency department after an accidental self-inflicted gunshot wound to the abdomen. She is alert and oriented. Her pulse is 110/min and blood pressure is 100/70 mm Hg. Physical examination shows a single entrance wound in the right upper quadrant with guarding and mild rebound tenderness. FAST examination shows free fluid in Morrison's pouch. Laboratory studies show hemoglobin of 11.5 g/dL. After initial resuscitation with crystalloid, her vital signs stabilize with pulse 95/min and blood pressure 115/75 mm Hg. Which of the following is the most appropriate next step in management?
3. A 19-year-old man is brought to the emergency department 30 minutes after sustaining a gunshot wound to the right thigh. On examination, he is alert and his vital signs are stable. There is an entrance wound on the medial thigh with moderate bleeding that is controlled with direct pressure. The right foot is pale and cool compared to the left, dorsalis pedis and posterior tibial pulses are absent by palpation and Doppler, and he has decreased sensation on the dorsum of the foot. Which of the following is the most appropriate next step in management?
Frequently asked questions
What causes the most tissue damage in gunshot wounds?
High-velocity projectiles cause the most damage through temporary cavitation, where kinetic energy creates a cavity 10-30 times the bullet diameter that stretches and tears tissues. Low-velocity bullets cause less extensive injury, damaging primarily tissues in the direct projectile path through crushing and laceration. Shotgun wounds at close range (<3 meters) cause massive destruction due to multiple projectiles and high energy concentration.
What are the first signs of a gunshot wound to the chest?
Early signs include dyspnea, chest pain, external bleeding from the wound, and signs of shock (tachycardia, hypotension). Diminished or absent breath sounds indicate pneumothorax or hemothorax. Subcutaneous emphysema suggests airway or lung injury. Beck's triad (hypotension, jugular venous distention, muffled heart sounds) indicates cardiac tamponade. Patients may also develop tachypnea, hypoxia, and anxiety. Immediate complications like tension pneumothorax present with severe respiratory distress and hemodynamic collapse.
How is a gunshot wound diagnosed and evaluated?
Diagnosis is clinical based on history and wound identification during physical examination. Initial assessment follows ATLS protocol with primary survey (airway, breathing, circulation, disability, exposure). Imaging depends on hemodynamic stability: unstable patients proceed directly to surgery after any immediately life-threatening thoracic pathology is addressed, while stable patients undergo CT angiography to define the projectile trajectory and identify organ injuries. FAST exam rapidly detects intraperitoneal or pericardial blood. Laboratory studies include complete blood count, type and crossmatch, coagulation studies, and lactate. Plain radiographs identify bullet location and pneumothorax.
Can you survive a gunshot wound and how is it treated?
Survival depends on the injury location, with 70-85% of patients reaching the hospital alive surviving to discharge. Immediate treatment focuses on hemorrhage control through direct pressure or tourniquets, followed by rapid transport to a trauma center. In the emergency department, resuscitation includes airway management, chest decompression if needed, IV access, and blood product transfusion. Hemodynamically unstable patients undergo immediate surgery, while stable patients may be managed non-operatively with close monitoring. Critical care, wound debridement, antibiotics, and rehabilitation follow initial stabilization.
Gunshot wound vs stab wound — what is the difference?
Gunshot wounds involve high-energy projectiles that create temporary cavitation, damaging tissues beyond the bullet path, whereas stab wounds are low-energy with injury limited to the blade's direct tract. GSWs have unpredictable trajectories after striking bone and may have entry and exit wounds, while stab wounds follow the weapon's path and have only an entry point. GSWs carry higher mortality due to greater tissue destruction and are more likely to injure multiple organs. Both are penetrating trauma, but GSWs require different forensic documentation and more commonly necessitate immediate operative intervention.
Key drugs
Related conditions and differentials
Sources and further reading
StatPearls (NCBI Bookshelf)MedlinePlusWHO ICD-10: T14.1
Educational content for medical students, prepared by the WhiteCoat Pro editorial team with AI assistance; every page is reviewed by a second AI model for factual errors. It is not medical advice and does not replace the product label, local guidelines or a clinician.