Tension pneumothorax in surgery

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"tension pneumothorax" needle decompression management

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Tension Pneumothorax in Surgery

Tension pneumothorax is the most life-threatening of all respiratory emergencies encountered in surgical practice. It is one of the six immediately life-threatening chest injuries in the "deadly dozen" described by ATLS.

Pathophysiology

A tension pneumothorax develops when a one-way valve mechanism allows air to enter the pleural space during inspiration but prevents its escape during expiration. Air progressively accumulates under increasing pressure, leading to:

Complete ipsilateral lung collapse - abolishing oxygenation and ventilation on that side
Mediastinal shift away from the affected side - compressing the contralateral lung
Compression of the superior and inferior vena cava - severely reducing venous return (preload)
Falling cardiac output - resulting in obstructive shock and cardiorespiratory arrest if untreated

The diagram below illustrates the one-way valve mechanism during inspiration (air enters) and expiration (valve closes, trapping air):

Pathophysiology of tension pneumothorax - one-way valve mechanism during inspiration and expiration, with CXR and CT showing left-sided tension hemopneumothorax with mediastinal shift

Roberts and Hedges' Clinical Procedures in Emergency Medicine, p. 264

Causes in the Surgical Context

Category	Examples
Penetrating chest trauma	Stab wounds, gunshot wounds (most common cause)
Blunt trauma	Parenchymal tear that fails to seal spontaneously
Iatrogenic	Central venous access (subclavian, internal jugular), mechanical PPV, thoracocentesis
PPV-related	Any patient on positive-pressure ventilation with a pneumothorax is at very high risk of tension developing
Occlusive dressings	Covering an open pneumothorax without a flutter valve
Airway injuries	Fractured trachea or bronchus, ruptured esophagus
CPR	Rib fractures penetrating lung + PPV = a well-recognised intraoperative/resuscitation hazard

Key surgical pearl: Any patient with penetrating thoracic injury about to be intubated and placed on mechanical ventilation should be considered for a prophylactic chest tube even without immediate CXR evidence of pneumothorax - Roberts and Hedges', p. 264.

Clinical Features

This is a clinical diagnosis - treatment must never be delayed for radiological confirmation.

Classic Signs

Respiratory distress - air hunger, tachypnea, increasing hypoxia
Absent/decreased breath sounds on the affected side
Hyperresonance to percussion on the affected side
Tracheal deviation away from the affected side (a late finding; may be masked by an ETT)
Distended neck veins (JVD) - may be absent if the patient is also hypovolaemic
Hypotension + tachycardia - haemodynamic collapse

In Ventilated Patients (Intraoperative)

The earliest sign on the ventilator is a sudden increase in peak airway pressure (resistance to ventilation). Blood pressure falls and CVP rises. This pattern during anaesthesia should trigger immediate suspicion.

Differentiation from Pericardial Tamponade

Both cause distended neck veins, hypotension, and a feeling of impending doom. The key differentiating features:

Feature	Tension Pneumothorax	Cardiac Tamponade
Breath sounds	Absent/reduced unilaterally	Normal bilaterally
Percussion	Hyperresonant	Normal
Tracheal deviation	Yes (away from affected side)	No
Heart sounds	Normal	Muffled
eFAST	No pericardial fluid	Pericardial fluid present

Bailey and Love's Short Practice of Surgery 28th Ed., p. 396

Radiology

Radiological confirmation is not required and actively not recommended if the patient is haemodynamically unstable. Nonetheless, the CXR appearance when the patient is stable enough to image:

CXR showing tension pneumothorax - left-sided complete lung collapse with marked tracheal and mediastinal shift to the right

Bailey and Love's Short Practice of Surgery 28th Ed., Figure 29.3 - note complete left lung collapse and dramatic rightward mediastinal shift

Management

Step 1: Immediate Needle Decompression (Needle Thoracostomy)

Insert a large-bore needle/angiocatheter (14G or larger, ≥5 cm length) to convert tension pneumothorax to a simple pneumothorax:

Two sites are accepted:

2nd intercostal space, mid-clavicular line (2ICS MCL) - traditional ATLS approach; insert above the upper border of the 3rd rib to avoid the neurovascular bundle
4th/5th intercostal space, anterior axillary line (4-5ICS AAL) - now preferred in current teaching (Bailey & Love "safe triangle"); the chest wall is thinner here, making success more reliable especially in obese patients

A rush of air confirms correct placement and should produce immediate haemodynamic improvement.

Note: A 2025 meta-analysis (PMID 40383767) reviewed the optimal needle length and decompression site, providing updated consensus recommendations relative to current ATLS/ETC guidelines - the lateral site (AAL) has higher success rates due to thinner chest wall.

Step 2: Chest Tube (Tube Thoracostomy)

Needle decompression is a bridge, not a definitive treatment. Always follow with a formal chest drain through the 5th intercostal space, anterior axillary line ("safe triangle"). The chest tube:

Provides definitive, sustained decompression
Drains any associated haemothorax
Allows lung re-expansion to seal the parenchymal defect

Step 3: Finger Thoracostomy

In extremis (cardiac arrest, no equipment available), a finger thoracostomy at the same safe-triangle location gives immediate pleural access while the chest tube is prepared. This is particularly valuable in the pre-hospital or damage-control setting.

Intraoperative / Perioperative Considerations

Any patient under positive-pressure ventilation (GA or ICU) is at heightened risk - a small pneumothorax can rapidly tension under PPV
An abrupt increase in peak inspiratory pressure with haemodynamic deterioration = tension pneumothorax until proven otherwise
Patients undergoing laparoscopic surgery (CO2 pneumoperitoneum) who develop intraoperative haemodynamic instability should also prompt consideration - diaphragmatic defects can allow CO2 entry into the pleural space
Post-subclavian/internal jugular central line insertion: always consider iatrogenic pneumothorax if patient deteriorates after line placement

Summary of Management Algorithm

Suspect tension pneumothorax
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Clinical diagnosis: absent BS + hyperresonance + haemodynamic instability
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IMMEDIATE needle decompression
(14G, ≥5cm - 2ICS MCL or 4-5ICS AAL)
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Rush of air + haemodynamic improvement
        │
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Chest tube (5ICS AAL, "safe triangle")
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        ▼
CXR to confirm lung re-expansion

Sources: Current Surgical Therapy 14e, p. 1310 | Bailey and Love's 28th Ed., p. 395-396 | Rosen's Emergency Medicine, pp. 2557-2565 | Roberts and Hedges' Clinical Procedures, p. 264 | Meta-analysis on needle decompression, PMID 40383767

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