Tertiary blast injury results from the physical displacement of the body by blast wind/overpressure, causing the victim to be thrown against fixed objects (walls, vehicles, ground) or struck by structural collapse, producing a spectrum of blunt trauma including closed head injuries, fractures, traumatic amputations, crush injuries, and blunt abdominal/thoracic trauma. [1-3] Unlike primary blast injury (barotrauma) or secondary blast injury (penetrating shrapnel), tertiary blast injury mirrors high-energy blunt trauma mechanisms and is often the most lethal component when structural collapse occurs. [2]
The following figure illustrates the classification of all blast injury types, including tertiary mechanisms:
1. History
- Circumstances of the explosion: type of device (IED, industrial, gas), distance from blast, open vs. enclosed space (enclosed environments worsen all blast categories) [1][5]
- Was the patient physically displaced or thrown? Against what surface? How far?
- Structural collapse: was the patient trapped or buried under debris? Duration of entrapment (critical for crush syndrome risk) [2]
- Loss of consciousness, amnesia, confusion (TBI screening)
- Timing of symptom onset — tertiary injuries may present immediately or evolve over hours (e.g., expanding intracranial hemorrhage, delayed compartment syndrome) [6]
- Associated symptoms: dyspnea, chest pain, abdominal pain, extremity pain/weakness, hearing loss, visual changes
- Important negatives: ability to ambulate at scene, no LOC, no entrapment
2. Alarm Features
- GCS < 14, altered mental status, unequal pupils, posturing → intracranial hemorrhage/herniation [5][7]
- Hemodynamic instability (SBP < 90 mmHg) → hemorrhagic shock from solid organ injury, pelvic fracture, or vascular injury
- Traumatic amputation or mangled extremity [2][8]
- Pain out of proportion to injury → compartment syndrome (irreversible damage within 6 hours) [9-10]
- Prolonged entrapment (>1 hour) → crush syndrome with hyperkalemia, rhabdomyolysis, AKI upon extrication [2][11]
- Flail chest, subcutaneous emphysema, tracheal deviation → pneumothorax/hemothorax
- Abdominal rigidity, distension → hollow or solid viscus injury
- Concurrent primary blast injury (blast lung) may coexist — do not assume injuries are isolated to one blast category [6][12]
3. Medications
- Acute resuscitation: Tranexamic acid (TXA) within 3 hours of injury for hemorrhagic shock; balanced blood product resuscitation (1:1:1 ratio of pRBC:FFP:platelets) [13]
- Analgesia: Ketamine for hemodynamically unstable patients; avoid excessive opioids that may mask compartment syndrome; regional anesthesia with caution (monitor for compartment syndrome) [14]
- Crush syndrome prophylaxis: Aggressive IV crystalloid (isotonic saline ± sodium bicarbonate) initiated ideally before extrication [11][15]
- Seizure prophylaxis: Levetiracetam or phenytoin for severe TBI (GCS ≤ 8) [16]
- Tetanus prophylaxis: Update if indicated for open wounds
- Antibiotics: Broad-spectrum for open fractures, contaminated wounds (cefazolin ± aminoglycoside per fracture grade)
- Contraindicated: Avoid potassium-containing IV fluids (LR) in crush syndrome; avoid high peak inspiratory pressures if concurrent blast lung [2]
4. Diet
- NPO in the acute setting — high likelihood of operative intervention
- Once stabilized: high-protein, high-calorie diet to support wound healing and recovery from catabolic state
- Adequate hydration critical in rhabdomyolysis management (target UOP > 200–300 mL/hr with IV fluids) [15][17]
- Enteral nutrition preferred over parenteral when feasible in ICU patients
5. Review of Systems
- Neuro: Headache, confusion, amnesia, seizures, focal deficits, vision changes, hearing loss, tinnitus
- Pulmonary: Dyspnea, hemoptysis, chest pain, cough (screen for concurrent blast lung)
- Cardiovascular: Palpitations, chest pain, syncope
- GI: Abdominal pain, nausea/vomiting, hematemesis, hematochezia
- MSK: Extremity pain, deformity, swelling, inability to bear weight, numbness/tingling
- GU: Hematuria, decreased urine output, dark/tea-colored urine (myoglobinuria)
- Psych: Anxiety, hyperarousal, dissociation, flashbacks (early PTSD screening) [5]
6. Collateral History and Family History
- Witnesses or first responders: mechanism details, estimated distance from blast, duration of entrapment, interventions performed (tourniquet placement, time applied)
- Pre-hospital vitals and GCS trajectory
- Anticoagulant or antiplatelet use (increases hemorrhage risk and compartment syndrome risk) [9]
- Baseline functional status, comorbidities
- Family history generally less relevant in acute trauma but note bleeding disorders
7. Risk Factors
- Proximity to blast and enclosed space detonation (higher mortality) [1][18]
- Structural collapse — dramatically increases tertiary injury severity and crush injury risk; mortality rises sharply with entrapment > 24 hours [2]
- Lack of protective equipment (body armor, helmets) [5]
- Extremes of age (children and elderly more vulnerable to blunt trauma)
- Anticoagulant use (higher risk of intracranial hemorrhage and compartment syndrome) [9]
- Pre-existing conditions: osteoporosis (fracture risk), coagulopathy
8. Differential Diagnosis
Tertiary blast injuries overlap with standard blunt trauma patterns. The key is to systematically evaluate for all blast injury categories simultaneously:
- Traumatic brain injury (concussion to severe TBI with intracranial hemorrhage) — most common cause of death in blast survivors [1][5]
- Long bone and pelvic fractures — may cause life-threatening hemorrhage [2]
- Crush injury/syndrome — rhabdomyolysis, hyperkalemia, AKI [2][11]
- Compartment syndrome — especially with long bone fractures or prolonged entrapment [9]
- Blunt thoracic trauma — pneumothorax, hemothorax, cardiac contusion, aortic injury
- Blunt abdominal trauma — splenic/hepatic laceration, hollow viscus perforation, mesenteric injury
- Traumatic amputation — often combined secondary + tertiary mechanism [2]
- Spinal cord injury — acceleration-deceleration mechanism
- Concurrent primary blast injury (blast lung, TM rupture, bowel perforation) — must not be overlooked; primary blast injuries are notorious for delayed onset [2][6]
9. Past Medical History
- Prior TBI (cumulative effects, worse outcomes with repeat injury) [12]
- Bleeding disorders or anticoagulant/antiplatelet therapy
- Chronic kidney disease (lower threshold for AKI with rhabdomyolysis)
- Osteoporosis or prior fractures
- Cardiac disease (tolerance of resuscitation, risk of myocardial contusion)
- Prior surgical history (especially abdominal — adhesions complicate operative management)
- Mental health history (baseline for PTSD assessment)
10. Physical Exam
- Primary survey (ATLS): Airway, Breathing, Circulation, Disability, Exposure — with simultaneous hemorrhage control [19]
- Vitals: Tachycardia and hypotension suggest hemorrhagic shock; tachypnea may indicate thoracic injury or metabolic acidosis
- Head/Neuro: GCS, pupil size/reactivity, scalp lacerations, Battle sign, raccoon eyes, otorrhea/rhinorrhea (basilar skull fracture); otoscopy for TM rupture [2]
- C-spine: Midline tenderness, step-off deformity — maintain immobilization until cleared
- Chest: Asymmetric breath sounds, crepitus, flail segment, subcutaneous emphysema
- Abdomen: Tenderness, guarding, rigidity, distension, seatbelt sign equivalent (contusion pattern)
- Pelvis: Instability on compression (apply binder if unstable; do not repeatedly test)
- Extremities: Deformity, open fractures, neurovascular status distally, compartment firmness, pain with passive stretch (compartment syndrome) [9]
- Skin: Contusions, abrasions, degloving injuries, tourniquet sites
11. Lab Studies
- Type and screen/crossmatch — anticipate massive transfusion
- CBC, BMP, lactate, coagulation studies (PT/INR, fibrinogen) — baseline and serial
- CK (creatine kinase) — rhabdomyolysis screening; >1000 U/L concerning, >5000 U/L high risk for AKI [20-21]
- Urinalysis — myoglobinuria (dipstick positive for blood without RBCs on microscopy)
- ABG/VBG — acidosis, base deficit (hemorrhage severity marker), PaO₂/FiO₂ ratio
- Serial potassium — hyperkalemia from crush injury can cause fatal arrhythmias; check q4–6h initially [21]
- Liver enzymes — hepatic injury screening
- Lipase — pancreatic injury
- Troponin — myocardial contusion
- Ethanol level, urine drug screen — if altered mental status
12. Imaging
- Chest and pelvis X-ray — rapid initial assessment per ATLS [3][22]
- FAST exam — point-of-care ultrasound for free fluid (hemoperitoneum, hemopericardium) [23]
- Whole-body CT (pan-scan) — the standard for major blast/blunt trauma in hemodynamically stable or responsive patients; head through pelvis with IV contrast. Identifies clinically unsuspected injuries in up to 38% of patients with closed head injury [22][24-25]
- CT head without contrast — mandatory if any alteration in consciousness, GCS < 15, or focal neurological deficit [7]
- CT angiography — for suspected vascular injury (e.g., blunt cerebrovascular injury, extremity vascular compromise)
- Plain radiographs of extremities — for suspected fractures
- When imaging is unnecessary: Hemodynamically unstable patients requiring immediate operative intervention should go directly to the OR; imaging should not delay life-saving surgery [19]
13. Special Tests
- FAST/E-FAST — bedside assessment for hemoperitoneum, hemothorax, pneumothorax, pericardial effusion
- Compartment pressure monitoring — indicated in obtunded patients or equivocal exam; fasciotomy when ΔP (diastolic BP − compartment pressure) < 30 mmHg [2][9]
- GCS and pupillometry — serial neurological assessment; automated pupillometry may detect early herniation [7]
- Transcranial Doppler — for vasospasm monitoring in blast-related severe TBI (peaks 10–16 days post-injury) [5]
- Injury Severity Score (ISS) — calculated retrospectively but guides resource allocation and prognostication
14. ECG
- Indications: All patients with significant blunt chest trauma, crush injury, or hyperkalemia risk
- Myocardial contusion: New arrhythmias (sinus tachycardia, atrial fibrillation, PVCs, bundle branch block), ST changes
- Hyperkalemia (crush syndrome): Peaked T waves → widened QRS → sine wave → cardiac arrest [21]
- Commotio cordis: Rare; VF from precordial impact
- Continuous telemetry monitoring for all admitted patients
15. Assessment
Tertiary blast injury produces a polytrauma pattern equivalent to high-energy blunt trauma — the victim is essentially a "human projectile". [1][3] Key assessment principles:
- Injuries are frequently multisystem — patients with >2 body regions injured have a 71% ICU admission rate [18]
- Tertiary injuries rarely occur in isolation; always evaluate for concurrent primary (blast lung, TM rupture, bowel barotrauma) and secondary (penetrating fragment) injuries [6][12]
- Structural collapse dramatically increases mortality, primarily through crush injury and traumatic asphyxia [2]
- Severity stratification: ISS ≥ 16 defines polytrauma; GCS ≤ 8 defines severe TBI
- Complications to anticipate: delayed intracranial hemorrhage, ARDS (from blast lung or massive transfusion), DIC, rhabdomyolysis-induced AKI, fat embolism syndrome, VTE, wound infection (including multidrug-resistant organisms in military settings) [5][26]
16. Treatment Plan
Initial stabilization (ATLS/TCCC principles)
- C-A-B-C: Control catastrophic hemorrhage → Airway → Breathing → Circulation [19][27]
- Tourniquet for life-threatening extremity hemorrhage — apply proximal to wound, note time; do not remove until surgical capability available. Tourniquet use is associated with significantly improved survival in traumatic amputation (90% of survivors vs. 24% of deceased had tourniquets applied in recent combat data) [8][27]
- Pelvic binder for suspected unstable pelvic fracture [13]
- Tube thoracostomy for pneumothorax/hemothorax
Resuscitation
- Damage-control resuscitation: permissive hypotension (target SBP 80–90 mmHg until hemorrhage control, except in TBI where SBP > 100 mmHg is targeted), balanced transfusion (1:1:1), TXA within 3 hours [13]
- For crush syndrome: aggressive IV normal saline (1 L/hr initially, up to 12 L/day); add sodium bicarbonate (50 mEq per 2nd–3rd liter) to maintain urine pH > 6.5; consider mannitol if UOP adequate [11][15]
Surgical management
- Damage-control surgery principles: hemorrhage control, contamination control, temporary closure [19]
- Fasciotomy for compartment syndrome — emergent, generous incisions releasing all compartments [9-10]
- Decompressive craniectomy for refractory intracranial hypertension in severe TBI [5]
- Definitive fracture fixation typically delayed (damage-control orthopedics with external fixation initially) [28]
ICU management
- ICP monitoring and CPP optimization for severe TBI (target CPP 60–70 mmHg) [16]
- Lung-protective ventilation (especially if concurrent blast lung — avoid high peak pressures) [2][26]
- Serial CK, potassium, renal function monitoring for rhabdomyolysis [17]
- Seizure prophylaxis (7 days for severe TBI) [16]
- VTE prophylaxis when safe from hemorrhage standpoint
- Early nutrition
17. Disposition
Admission criteria (most tertiary blast injury patients require admission):
- GCS < 15 or any neurological deficit → admit (neurosurgical consultation if GCS ≤ 8 or intracranial pathology)
- Hemodynamic instability or need for transfusion → ICU
- Operative injuries (fractures requiring fixation, solid organ injury, intracranial hemorrhage)
- Rhabdomyolysis (CK > 5000 U/L or rising) requiring IV fluid resuscitation
- Compartment syndrome risk requiring serial exams q1–2h for 24–48 hours [9]
- Polytrauma (ISS ≥ 16) → ICU [18]
- Any concurrent primary blast injury (blast lung) → ICU with minimum 8-hour observation [2]
Discharge criteria
Specialist consultation triggers
- Trauma surgery (all significant tertiary blast injuries)
- Neurosurgery (intracranial pathology, depressed skull fracture)
- Orthopedics (fractures, compartment syndrome)
- Vascular surgery (vascular injury, ischemic limb)
- Nephrology (AKI from crush syndrome requiring RRT)
18. Follow Up / Return Precautions
- TBI follow-up: Neurocognitive assessment at 1–2 weeks; screen for post-concussive syndrome, PTSD, and cognitive deficits [5]
- Orthopedic follow-up: Within 1–2 weeks for fracture management; earlier if worsening pain or swelling
- Rhabdomyolysis: Repeat CK and renal function within 48–72 hours if discharged
- Rehabilitation: Multidisciplinary team (PT, OT, neuropsych, vestibular rehab, ophthalmology) — especially for blast-related TBI [5]
Return precautions (instruct patient/family)
- Worsening headache, vomiting, confusion, seizure, visual changes, unequal pupils → return immediately
- Increasing extremity pain, swelling, numbness, or weakness → return immediately (compartment syndrome)
- Dark/cola-colored urine, decreased urine output → return immediately (rhabdomyolysis/AKI)
- Chest pain, shortness of breath, hemoptysis → return immediately
- Fever, wound redness/drainage → return for infection evaluation
- Expected recovery: varies widely by injury severity; mild injuries may resolve in weeks, while severe polytrauma and TBI require months to years of rehabilitation [5]
References
1. Blast Injuries. — Wolf SJ, Bebarta VS, Bonnett CJ, Pons PT, Cantrill SV. Lancet. 2009.
2. Blast Injuries. — DePalma RG, Burris DG, Champion HR, Hodgson MJ. The New England Journal of Medicine. 2005.
3. Blast Injuries: From Improvised Explosive Device Blasts to the Boston Marathon Bombing. — Singh AK, Ditkofsky NG, York JD, et al. Radiographics : A Review Publication of the Radiological Society of North America, Inc. 2016.
4. Blast Injuries. — Ortega R, Vietor R, Arbelaez C, et al. The New England Journal of Medicine. 2024.
5. Blast-Related Traumatic Brain Injury. — Rosenfeld JV, McFarlane AC, Bragge P, et al. The Lancet. Neurology. 2013.
6. High Risk and Low Prevalence Diseases: Blast Injuries. — Bukowski J, Nowadly CD, Schauer SG, Koyfman A, Long B. The American Journal of Emergency Medicine. 2023.
7. The Management of Severe Traumatic Brain Injury in the Initial Postinjury Hours - Current Evidence and Controversies. — Hossain I, Rostami E, Marklund N. Current Opinion in Critical Care. 2023.
8. Amputation Trends in Military Personnel During the Israel-Hamas War in 2023-24. — Chechik Y, Almog O, Gutterman YJ, Abuhasira S. Injury. 2025.
9. Best Practices In The Management Of Orthopaedic Trauma. — Matthew L. Davis MD FACS, Gregory J. Della Rocca MD PhD FACS, Megan Brenner MD MS RPVI FACS, et al American College of Surgeons (2015). 2015.
10. Diagnosis and Treatment of Acute Extremity Compartment Syndrome. — von Keudell AG, Weaver MJ, Appleton PT, et al. Lancet. 2015.
11. Management of Crush-Related Injuries after Disasters. — Sever MS, Vanholder R, Lameire N. The New England Journal of Medicine. 2006.
12. Management and Rehabilitation of Post-Acute Mild Traumatic Brain Injury (mTBI) (2021). — Maj Thomas J. Bayuk DO, Amy O. Bowles MD, Lt Col Andrew W. Bursaw DO, et al Department of Veterans Affairs. 2021.
13. American Association for the Surgery of Trauma/American College of Surgeons Committee on Trauma: Clinical Protocol for Damage-Control Resuscitation for the Adult Trauma Patient. — LaGrone LN, Stein D, Cribari C, et al. The Journal of Trauma and Acute Care Surgery. 2024.
14. Best Practices Guidelines For Acute Pain Management In Trauma Patients. — Andrew Bernard, Douglas R. Oyler PharmD, Jeffrey O. Anglen MD FACS FAAOS, et al American College of Surgeons (2020). 2020.
15. Rhabdomyolysis and Acute Kidney Injury. — Bosch X, Poch E, Grau JM. The New England Journal of Medicine. 2009.
16. Management and Challenges of Severe Traumatic Brain Injury. — Rakhit S, Nordness MF, Lombardo SR, et al. Seminars in Respiratory and Critical Care Medicine. 2021.
17. An Evidence-Based Narrative Review of the Emergency Department Evaluation and Management of Rhabdomyolysis. — Long B, Koyfman A, Gottlieb M. The American Journal of Emergency Medicine. 2019.
18. ICU Admission, Discharge, and Triage Guidelines: A Framework to Enhance Clinical Operations, Development of Institutional Policies, and Further Research. — Nates JL, Nunnally M, Kleinpell R, et al. Critical Care Medicine. 2016.
19. The First Aid and Hospital Treatment of Gunshot and Blast Injuries. — Franke A, Bieler D, Friemert B, et al. Deutsches Arzteblatt International. 2017.
20. Rhabdomyolysis. — Zimmerman JL, Shen MC. Chest. 2013.
21. Medical Complications Associated With Earthquakes. — Bartels SA, VanRooyen MJ. Lancet. 2012.
22. ACR Appropriateness Criteria® Major Blunt Trauma. — Shyu JY, Khurana B, Soto JA, et al. Journal of the American College of Radiology : JACR. 2020.
23. Point-of-Care Ultrasonography for Diagnosing Thoracoabdominal Injuries in Patients With Blunt Trauma. — Stengel D, Leisterer J, Ferrada P, et al. The Cochrane Database of Systematic Reviews. 2018.
24. Best Practices Guidelines In Imaging. — Gail T. Tominaga MD FACS, Mark Bernstein MD, Michael R. Aquino MD MHSc, et al American College of Surgeons (2018). 2018.
25. Whole-Body Computed Tomography in Severely Injured Patients. — Huber-Wagner S, Kanz KG, Hanschen M, et al. Current Opinion in Critical Care. 2018.
26. Thoracic Injury in Patients Injured by Explosions on the Battlefield and in Terrorist Incidents. — McDonald Johnston A, Alderman JE. Chest. 2020.
27. Initial Care of the Severely Injured Patient. — King DR. The New England Journal of Medicine. 2019.
28. Blurred Front Lines: Triage and Initial Management of Blast Injuries. — Balazs GC, Blais MB, Bluman EM, Andersen RC, Potter BK. Current Reviews in Musculoskeletal Medicine. 2015.