2. Chest Trauma

Quick Recap

Trauma System, Protocol 2/8. Built on ATLS 11th Edition. Tension pneumothorax overlaps with the dedicated Pneumothorax protocol (Respiratory System) — this protocol covers the FULL spectrum of chest trauma (hemothorax, flail chest, cardiac tamponade, diaphragm injury, tracheobronchial injury, pulmonary contusion) with trauma-specific nuance.

1. Physical Signs Reference Table (ATLS 11th Edition)

Distended neck veins are difficult to assess and may be ABSENT if concurrent hemorrhagic shock is present — do not rule out tension physiology for lack of this sign. May shift away from injury if tension physiology develops. Massive diaphragmatic herniation can itself produce tension physiology with distended veins/hypotension. May be distended if concurrent tension pneumothorax.

Key discriminator: tension physiology (pneumothorax OR hemothorax) causes DECREASED BP via impaired venous return; massive hemothorax alone causes decreased BP via hemorrhagic volume loss (flat, not distended, neck veins) — use neck vein status to help distinguish tension physiology from pure hemorrhagic shock when the presentation is ambiguous.

2. Tension Pneumothorax — Updated Decompression Sites

Clinical diagnosis mandates emergent decompression — do not wait for imaging.

Two ATLS-recognized needle catheter insertion sites (choice depends on patient factors/clinical scenario): 5th intercostal space (approximately at the inframammary fold, between mid and anterior axillary lines) OR 2nd intercostal space at the midclavicular line. Use a large-bore (>=14 gauge) over-the-needle catheter. Needle decompression's benefit is speed; limitations include variable chest wall thickness, catheter kinking, and other technical factors limiting success/duration.

Finger thoracostomy (scalpel incision at the 5th ICS between mid/anterior axillary lines, finger inserted to release air/fluid) is an alternative emergent decompression approach, performed as part of chest tube insertion.

Tension pneumothorax CAN RECUR after either needle or finger decompression (soft tissue can occlude the created tract) — tube thoracostomy insertion follows emergent decompression as definitive treatment; serial re-decompression may be needed while awaiting tube placement.

3. Pneumothorax Management Nuances

Tube thoracostomy is definitive treatment for pneumothorax/hemothorax. A 14 French thoracic catheter is EQUALLY EFFECTIVE as larger tubes for pneumothorax, with LESS pain — favor smaller-bore tubes where clinically appropriate. Ultrasound-guided tube insertion aids placement confirmation where operator expertise allows.

Asymptomatic/occult pneumothorax (CT-visible, not seen on plain film): management is variable across trauma centers; recent evidence supports observation WITHOUT tube thoracostomy for pneumothoraces <3.5cm from the chest wall on CT, provided the patient is asymptomatic. Failure of the non-tube strategy is associated with: positive-pressure ventilation, more severe chest injury, and concurrent hemothorax — these factors should lower the threshold for tube placement even in an otherwise-observable small pneumothorax. An INCREASING pneumothorax size on serial CXR is an indication for chest tube placement.

4. Massive and Tension Hemothorax

Massive hemothorax: classically defined as >1500mL blood, or more than 1/3 of the patient's blood volume, in the thoracic cavity — causes hemorrhagic shock. Tension hemothorax additionally produces impaired venous return (tension physiology) on top of the hemorrhagic volume loss — a combined, particularly dangerous mechanism.

Sources: direct lung injury, severed intercostal vessel, rib fracture, injured thoracic viscera, or abdominal injury entering the chest via a diaphragmatic defect; penetrating cardiac injury can cause hemothorax if concurrent pericardial AND pleural defects exist.

Management: most hemothoraces are treated with tube thoracostomy — massive/tension hemothorax is treated with FINGER thoracostomy first, then tube. A 14F catheter is equally effective as larger tubes for hemothorax too, BUT most supporting studies EXCLUDED massive/tension hemothorax, which is typically still treated with a larger-bore (>=24F) tube given the need to evacuate large volumes of blood/clot rapidly.

Operative intervention indications: based on PHYSIOLOGIC STATUS (ongoing shock) and CONTINUED BLEEDING rather than a fixed initial or cumulative chest tube output number — do not rely purely on a volume threshold (e.g., "1500mL immediate output") in isolation; integrate the full clinical trajectory. Emergency transfusion is common in this scenario.

Chest tube irrigation protocols (once bleeding is controlled) have shown reduced rates of retained hemothorax and delayed surgery at some trauma centers — consider per local protocol.

5. Flail Chest and Rib Fractures

Definitions: radiographic flail segment = 2+ ribs broken in 2+ places on imaging (can exist WITHOUT clinical correlate); clinical flail chest = paradoxical chest wall movement during respiration (a clinical diagnosis; radiographic flail can exist without clinical flail, but not the reverse). Paradoxical movement is REDUCED/difficult to detect during positive-pressure ventilation — do not rely on this sign once the patient is intubated.

Mechanism of respiratory failure: rib fractures cause progressive HYPERCAPNIC failure from pain-limited inspiration (splinting); SEVERE HYPOXEMIA specifically reflects concomitant pulmonary contusion and/or pneumothorax, not the rib fractures alone.

Pulmonary contusion trajectory: WORSENS over the first 48 HOURS before improving — a critical time-course fact for ventilator/ICU planning; do not interpret early worsening as treatment failure, and anticipate the peak-severity window when making extubation/weaning decisions.

Management — the leading cause of morbidity/mortality after rib fractures is PNEUMONIA from pain-limited pulmonary hygiene, making pain control THE central intervention:

• Multimodal analgesia, emphasizing NON-OPIOID therapies and locoregional techniques: acetaminophen, NSAIDs, ketamine, lidocaine, and regional nerve blocks (e.g., thoracic epidural specifically noted as beneficial) — opioid-sparing approach is deliberate, given opioids' own respiratory-depressant and pulmonary-hygiene-impairing effects
• Chest physiotherapy, incentive spirometry, and other alveolar-expansion/pulmonary hygiene measures
• Intubation indications: inability to breathe from flail/chest wall instability, severe hypoxia from underlying contusion, or need for sedating medications to achieve adequate pain control
• Surgical rib fixation is effective in mitigating morbidity for SELECT flail chest injuries — not universal, individualized by injury pattern and trajectory
• Triage algorithms (inpatient vs outpatient, ICU vs ward) based on patient demographics/injury severity help standardize appropriate monitoring intensity

6. Cardiac Tamponade (Traumatic)

Diagnosis: arrhythmias, unexplained hypotension despite adequate resuscitation, echocardiography, cardiac enzymes (troponin/CK) to help rule out blunt cardiac injury as a contributing/alternative diagnosis.

Immediate management: pericardiocentesis as a TEMPORIZING maneuver, followed by IMMEDIATE thoracotomy or sternotomy for definitive repair — this differs from the more nuanced medical/percutaneous-first approach in NON-traumatic tamponade (see Cardiac Tamponade protocol, Cardiovascular System) given the traumatic etiology typically implies an ongoing surgical source requiring definitive repair, not just drainage.

Treatment beyond decompression: inotropic support, supportive care, surgical repair; echocardiogram vs cardiac catheterization to further assess structural injury once stabilized.

7. Diaphragm Injury

Often NOT detected on physical exam alone — signs/symptoms relate to herniated abdominal viscera effects when present; massive herniation into the LEFT chest can itself produce tension physiology (distended neck veins, hypotension) mimicking tension pneumothorax/hemothorax.

Management: left diaphragm injuries are repaired URGENTLY, operatively. Diaphragmatic injury with herniated abdominal viscera into the chest requires IMMEDIATE operative repair given visceral strangulation risk — a time-critical surgical emergency, not a delayed-repair injury. A transabdominal surgical approach is most often selected. Careful chest tube placement technique is essential — blind insertion risks inadvertently injuring herniated abdominal contents that have migrated into the chest cavity.

8. Tracheobronchial Injury

Clinical clue: continued air leak after chest tube insertion, with potential for massive subcutaneous emphysema — a persistent large air leak despite a correctly placed, functioning chest tube should raise this diagnosis rather than being attributed to tube malposition alone.

Management: guided intubation distal to the injury site, or unilateral (single-lung) ventilation, with immediate surgical intervention.

9. Immediate Stabilization (ABCDE) — Summary Checklist

Checklist:

10. Investigations

CXR (initial screen), CT chest with IV contrast if hemodynamically stable (better characterization of hemothorax volume, contusion extent, diaphragm/great vessel injury), eFAST (pericardial effusion, pneumothorax/hemothorax screening), echocardiogram if cardiac injury/tamponade suspected, cardiac enzymes (troponin/CK) if blunt cardiac injury suspected, serial CXR to track pneumothorax size trend.

11. Organ Support

Mechanical ventilation for flail chest/severe contusion-related respiratory failure or airway compromise; multimodal analgesia (including regional techniques) as a core supportive intervention, not an afterthought; standard ICU supportive care; blood product resuscitation per Hypovolemic Shock protocol principles for hemothorax-associated hemorrhagic shock.

12. Consultation Matrix

13. Monitoring Framework

Serial respiratory status assessment, serial CXR (pneumothorax size trend, hemothorax resolution), chest tube output trend integrated with physiologic status, pain control adequacy (pulmonary hygiene compliance marker), watch for the 48-hour pulmonary contusion worsening window.

14. Complications

Recurrent tension physiology after decompression, retained hemothorax, pneumonia (rib fracture/flail chest-associated, the dominant morbidity driver), ARDS from severe pulmonary contusion, visceral strangulation (diaphragm injury), massive subcutaneous emphysema (tracheobronchial injury). Prevention: correct decompression technique and site, aggressive multimodal pain control for pulmonary hygiene, urgent diaphragm repair, chest tube irrigation protocols for hemothorax. Rescue: repeat decompression/tube placement, surgical exploration for ongoing bleeding/tracheobronchial injury/diaphragm herniation, ECMO consideration for refractory ARDS per the ARDS protocol.

15. Escalation & De-escalation

Escalate: ongoing physiologic instability/bleeding despite tube thoracostomy -> operative exploration; diaphragm injury with herniation -> immediate surgery; persistent air leak -> tracheobronchial injury workup and surgical involvement.

De-escalate: hemothorax/pneumothorax resolved, air leak resolved, pain controlled with adequate pulmonary hygiene -> chest tube removal per standard criteria, wean respiratory support.

16. ICU Discharge Criteria

Respiratory status stable, chest tube(s) removed or on a clear resolution trajectory, pain controlled on a stepped-down regimen, no ongoing air leak or hemorrhage, pulmonary contusion past its 48h worsening window and trending toward improvement.

17. Documentation & Medicolegal Checklist

18. Key Guidelines

American College of Surgeons. Advanced Trauma Life Support, 11th Edition Course Manual, 2023 (Chapter 5: Breathing and Ventilation Assessment and Management; Chapter 21: Thoracic, Abdominopelvic, and Genitourinary Trauma).

19. Controversies

The optimal management threshold for asymptomatic occult pneumothorax (observe vs tube) continues to be refined, with the 3.5cm CT-based threshold representing recent, evolving evidence rather than long-established consensus. Chest tube size selection (14F vs larger) for hemothorax specifically remains debated given most supporting small-bore-tube evidence excluded the massive/tension hemothorax population where larger tubes remain standard. The precise timing/threshold for surgical rib fixation in flail chest is individualized rather than protocolized.

20. References

1. American College of Surgeons. Advanced Trauma Life Support, 11th Edition Course Manual, 2023 (Chapter 5, Chapter 21).
2. Govil D, Kumar GP. General Management of Trauma. ICU Protocols: A Step-wise Approach, 2nd ed. Springer; 2020 (Ch. 10).
3. Other Injuries Requiring ICU Care (Massive Hemothorax, Flail Chest, Pulmonary Contusion, Cardiac Tamponade sections). Washington Manual of Critical Care, 4th ed, 2025 (Ch. 2 region).

See also: Pneumothorax (Respiratory System) for the general tension pneumothorax management principles shared with this protocol; Cardiac Tamponade (Cardiovascular System) for the non-traumatic tamponade contrast; Polytrauma (Trauma System) for the overarching xABCDE framework.