Emergency Medicine
Tension Pneumothorax
Tension pneumothorax is a time-critical clinical diagnosis of respiratory and/or circulatory compromise from pleural air under pressure. Decompress immediately when instability or severe respiratory compromise is present; do not delay for imaging, then provide definitive pleural drainage.
Clinical emergency
Recognize tension physiology and decompress without imaging delay
The immediate decision is based on physiologic compromise, not radiographic confirmation.
Tension pneumothorax is progressive intrapleural air accumulation that impairs ventilation and venous return, potentially causing rapid cardiopulmonary collapse.ScienceDirect+1ScienceDirectPrehospital decompression of tension pneumothorax: Have we moved the needle?PubMedTension Pneumothorax - StatPearls - NCBI Bookshelf In trauma, ICU, and prehospital populations, reported incidence is approximately 1% to 3%, although the true frequency is uncertain.Wolters Kluwer+1Wolters KluwerClinical Presentation of Patients With Tension... : Annals of SurgeryScienceDirectPrehospital decompression of tension pneumothorax: Have we moved the needle?
Suspect the diagnosis in a compatible setting—thoracic trauma, positive-pressure ventilation, or iatrogenic pleural injury—with acute respiratory or circulatory deterioration. Hemodynamic instability or severe respiratory compromise should trigger immediate decompression before imaging.PubMed+1PubMedPrehospital management of chest injuries in severely injured patients—a systematic review and clinical practice guideline update - PMCnice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE Waiting for chest radiography in mechanically ventilated patients with suspected tension pneumothorax has been associated with increased risk of death; major authorities therefore support emergency thoracostomy when suspicion is high.PubMedPubMedClinical manifestations of tension pneumothorax: protocol for a systematic review and meta-analysis
Use the primary survey to identify rapidly worsening oxygenation, ventilation, perfusion, or arrest in a patient at risk for pleural air under pressure.Wolters Kluwer+2Wolters KluwerClinical Presentation of Patients With Tension... : Annals of SurgeryPubMedPrehospital management of chest injuries in severely injured patients—a systematic review and clinical practice guideline update - PMCPubMedTension Pneumothorax - StatPearls - NCBI Bookshelf
Do not require the full classic constellation of unilateral absent breath sounds, jugular venous distention, tracheal deviation, and hypotension; delayed or missed diagnoses occur when clinicians rely on classic findings alone.ScienceDirect+1ScienceDirectUltrasound Findings in Tension Pneumothorax: A Case ReportPubMedClinical manifestations of tension pneumothorax: protocol for a systematic review and meta-analysis
If the patient has an open chest wound, apply a simple occlusive dressing and monitor for evolving tension physiology.nice org uknice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE
Bedside diagnosis
Use imaging only when it does not defer required decompression
Imaging clarifies uncertain or stable cases; it must not interrupt emergency treatment.
In an unstable patient with suspected tension pneumothorax, diagnosis is clinical and decompression takes priority over chest radiography or CT.PubMed+2PubMedClinical manifestations of tension pneumothorax: protocol for a systematic review and meta-analysisPubMedTension Pneumothorax - StatPearls - NCBI Bookshelfnice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE CT is the most definitive imaging modality for pneumothorax when radiography is uncertain, but routine CT is inappropriate for suspected tension physiology.PubMedPubMedTension Pneumothorax - StatPearls - NCBI Bookshelf
When the patient is sufficiently stable for testing, chest radiography and point-of-care ultrasound can support the diagnosis. eFAST may augment clinical assessment only when skilled operators and equipment are immediately available and use will not delay transfer or treatment; a negative chest eFAST does not exclude pneumothorax.nice org uknice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE
Absent lung sliding is not specific for pneumothorax: mimics include COPD blebs, consolidation, atelectasis, mainstem intubation, scarring, and interstitial lung disease. In the appropriate setting, absent lung sliding together with a dilated inferior vena cava or mediastinal shift should heighten concern for tension physiology.ScienceDirectScienceDirectUltrasound Findings in Tension Pneumothorax: A Case Report
For a deteriorating intubated patient, concurrently consider other immediately reversible causes of sudden hypoxemia or hypotension, including tube malposition; this does not justify delaying decompression when tension pneumothorax is strongly suspected.Wolters Kluwer+2Wolters KluwerClinical Presentation of Patients With Tension... : Annals of SurgeryScienceDirectUltrasound Findings in Tension Pneumothorax: A Case ReportPubMedClinical manifestations of tension pneumothorax: protocol for a systematic review and meta-analysis
A negative ultrasound result should not override high clinical concern in an unstable patient.nice org uknice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE
Procedure
Choose a rapid decompression method, then secure definitive pleural drainage
The optimal initial technique depends on expertise, access, equipment, and the need for immediate release.
Emergency decompression may be performed with needle decompression, simple/open thoracostomy, or tube thoracostomy. Comparative studies have not established superiority among these approaches.PubMedPubMedPrehospital management of chest injuries in severely injured patients—a systematic review and clinical practice guideline update - PMC NICE recommends open thoracostomy rather than needle decompression when expertise is available in the prehospital setting, and in hospital recommends open thoracostomy followed by chest drain placement for tension pneumothorax.nice org uknice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE StatPearls similarly describes immediate needle decompression followed by tube thoracostomy as standard emergency management.PubMedPubMedTension Pneumothorax - StatPearls - NCBI Bookshelf
Needle decompression should be understood as a bridge, not definitive treatment. Catheter obstruction, kinking, dislodgement, insufficient intrapleural reach, or ongoing air leak can leave or recreate tension physiology; proceed to tube thoracostomy after initial release and reassess continuously.PubMed+2PubMedTension Pneumothorax - StatPearls - NCBI Bookshelfnice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICEScienceDirectTension Pneumothorax Managed Without Immediate ...
Anatomic and device selection remain debated. In one ultrasound pilot study, 28 of 30 healthy volunteers had a smaller skin-to-pleura distance at the fifth intercostal space along the midaxillary line than at the second intercostal space midclavicular line.ScienceDirectScienceDirectUsing Ultrasound to Determine Optimal Location for Needle Decompression of Tension Pneumothorax: A Pilot Study - ScienceDirect CT-based analyses cited in that study estimated lower anticipated failure at the fifth intercostal space midaxillary line than the second intercostal space midclavicular line, but available evidence is heterogeneous and primarily based on anatomic measurements rather than clinical outcomes.ScienceDirect+2ScienceDirectUsing Ultrasound to Determine Optimal Location for Needle Decompression of Tension Pneumothorax: A Pilot Study - ScienceDirectScienceDirectPrehospital decompression of tension pneumothorax: Have we moved the needle?PubMedMeta-analysis of the optimal needle length and decompression site for tension pneumothorax and consensus recommendations on current ATLS and ETC guidelines
For suspected tension pneumothorax with instability, use the decompression technique that can be executed immediately and reliably by the available trained team; do not delay treatment to obtain ultrasound site measurements.PubMed+1PubMedPrehospital management of chest injuries in severely injured patients—a systematic review and clinical practice guideline update - PMCnice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE
After a needle attempt, assess for clinical release and recurrent deterioration. Persistent or recurrent instability requires immediate escalation to thoracostomy/chest drainage and evaluation for failed or incorrect decompression.PubMed+1PubMedTension Pneumothorax - StatPearls - NCBI Bookshelfnice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE
Follow local trauma, emergency medicine, and prehospital protocols for insertion site, catheter length, and approach; the supplied evidence does not establish a single universally superior device-site combination.ScienceDirect+1ScienceDirectPrehospital decompression of tension pneumothorax: Have we moved the needle?PubMedMeta-analysis of the optimal needle length and decompression site for tension pneumothorax and consensus recommendations on current ATLS and ETC guidelines
Needle-site evidence and limitations
Chest-wall thickness varies substantially. A standard 4.4-cm angiocatheter was projected to fail in 50% of one CT-based population at the second intercostal space midclavicular line.ScienceDirectScienceDirectUsing Ultrasound to Determine Optimal Location for Needle Decompression of Tension Pneumothorax: A Pilot Study - ScienceDirect An abstract of 141 adults found BMI greater than 30 associated with increased odds of anticipated failure using a 5-cm catheter, reinforcing the need to consider body habitus and available catheter length.annemergmedannemergmedYMEM_v70_i4_sS_COVER.indd
A 2025 meta-analysis suggested a 7-cm needle may be appropriate for right-sided decompression at either fifth intercostal midaxillary or second intercostal midclavicular sites, but explicitly cautioned that heterogeneity, bias, and variable measurement methods limit confidence.ScienceDirectScienceDirectPrehospital decompression of tension pneumothorax: Have we moved the needle?
The same analysis raised concern for left-sided cardiac injury with more lateral fifth-intercostal approaches and suggested the second intercostal midclavicular site may be safer on the left; this is a conditional interpretation, not definitive clinical-outcome evidence.ScienceDirectScienceDirectPrehospital decompression of tension pneumothorax: Have we moved the needle?
Monitoring
Reassess immediately for failed decompression, recurrence, and competing causes of collapse
Clinical response—not the procedure itself—confirms that tension physiology has been addressed.
Following any decompression, reassess oxygenation, ventilation, blood pressure, chest findings, and overall trajectory immediately. NICE specifically recommends observation for recurrent tension pneumothorax after chest decompression.nice org uknice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE Persistent deterioration after a needle attempt should be treated as possible unsuccessful decompression, ongoing leak, malposition, or an alternative/additional cause of shock or hypoxemia; establish definitive drainage without delay when tension physiology persists.PubMed+1PubMedTension Pneumothorax - StatPearls - NCBI BookshelfScienceDirectTension Pneumothorax Managed Without Immediate ...
Tube thoracostomy and the underlying injury can produce complications, including pulmonary injury and recurrent tension physiology. Ongoing monitoring after stabilization is therefore necessary.PubMedPubMedTension Pneumothorax - StatPearls - NCBI Bookshelf
Document preprocedure physiology, procedure type and site, immediate response, and the time definitive chest drainage was achieved.
In ventilated patients, maintain heightened surveillance because assisted ventilation is associated with hypotension, hypoxemia, and arrest presentations and can worsen unrecognized pleural air accumulation.Wolters Kluwer+1Wolters KluwerClinical Presentation of Patients With Tension... : Annals of SurgeryPubMedTension Pneumothorax - StatPearls - NCBI Bookshelf
Common questions
Can a normotensive patient have tension pneumothorax?
Yes. In spontaneously breathing patients, respiratory signs and symptoms may predominate, while hypotension is relatively uncommon and less sensitive than in mechanically ventilated patients. Clinical deterioration and severe respiratory compromise should drive intervention.BMJ+2BMJTension pneumothorax—time for a re-think? | Emergency Medicine JournalWolters KluwerClinical Presentation of Patients With Tension... : Annals of Surgerynice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE
Should point-of-care ultrasound delay decompression?
No. In suspected tension pneumothorax with hemodynamic instability or severe respiratory compromise, decompress before imaging. Ultrasound may augment assessment only when immediately available and non-delaying; a negative eFAST does not exclude pneumothorax.nice org uknice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE
Is needle decompression definitive treatment?
No. Needle decompression is an emergency temporizing method. Definitive management requires chest drainage, and patients require observation for recurrent tension physiology after decompression.PubMed+1PubMedTension Pneumothorax - StatPearls - NCBI Bookshelfnice org ukRecommendations | Major trauma: assessment and initial management | Guidance | NICE
What is the preferred needle decompression site?
No single site is conclusively supported by clinical-outcome evidence. Studies suggest the fifth intercostal space near the midaxillary line often has a shorter chest-wall distance than the second intercostal midclavicular site, but evidence is heterogeneous and patient anatomy, laterality, equipment, and local protocol matter.ScienceDirect+2ScienceDirectUsing Ultrasound to Determine Optimal Location for Needle Decompression of Tension Pneumothorax: A Pilot Study - ScienceDirectScienceDirectPrehospital decompression of tension pneumothorax: Have we moved the needle?PubMedMeta-analysis of the optimal needle length and decompression site for tension pneumothorax and consensus recommendations on current ATLS and ETC guidelines
References
- Tension pneumothorax—time for a re-think? | Emergency Medicine Journal — emj.bmj.com · emj.bmj.com
- Pneumothorax: An update on clinical spectrum, diagnosis ... — www.sciencedirect.com · www.sciencedirect.com
- Clinical Presentation of Patients With Tension... : Annals of Surgery — journals.lww.com · journals.lww.com
- Ultrasound Findings in Tension Pneumothorax: A Case Report — www.sciencedirect.com · www.sciencedirect.com
- Using Ultrasound to Determine Optimal Location for Needle Decompression of Tension Pneumothorax: A Pilot Study - ScienceDirect — www.sciencedirect.com · www.sciencedirect.com
- Prehospital decompression of tension pneumothorax: Have we moved the needle? — www.sciencedirect.com · www.sciencedirect.com
- Finger Thoracostomy for Tension Pneumothorax — journals.lww.com · journals.lww.com
- Prehospital management of chest injuries in severely injured patients—a systematic review and clinical practice guideline update - PMC — pmc.ncbi.nlm.nih.gov · pmc.ncbi.nlm.nih.gov
- Clinical manifestations of tension pneumothorax: protocol for a systematic review and meta-analysis — pmc.ncbi.nlm.nih.gov · pmc.ncbi.nlm.nih.gov
- New strategies in the management of pneumothorax - PMC — pmc.ncbi.nlm.nih.gov · pmc.ncbi.nlm.nih.gov
- Meta-analysis of the optimal needle length and decompression site for tension pneumothorax and consensus recommendations on current ATLS and ETC guidelines — pmc.ncbi.nlm.nih.gov · pmc.ncbi.nlm.nih.gov
- Tension Pneumothorax - StatPearls - NCBI Bookshelf — www.ncbi.nlm.nih.gov · www.ncbi.nlm.nih.gov
- Spontaneous Pneumothorax - StatPearls - NCBI Bookshelf - NIH — www.ncbi.nlm.nih.gov · www.ncbi.nlm.nih.gov
- Acute Pneumothorax Evaluation and Treatment - NCBI - NIH — www.ncbi.nlm.nih.gov · www.ncbi.nlm.nih.gov
- EMS Pneumothorax Identification Without Ancillary Testing - StatPearls - NCBI Bookshelf — www.ncbi.nlm.nih.gov · www.ncbi.nlm.nih.gov
- Research Forum Educational Program 2017 — www.annemergmed.com · www.annemergmed.com
- Recommendations | Major trauma: assessment and initial management | Guidance | NICE — www.nice.org.uk · www.nice.org.uk
- Major trauma: assessment and initial manaement DRAFT — www.nice.org.uk · www.nice.org.uk
- Major trauma — www.nice.org.uk · www.nice.org.uk
- Trauma: Service delivery — www.nice.org.uk · www.nice.org.uk
- Emergency Ultrasound Imaging Criteria Compendium — www.annemergmed.com · www.annemergmed.com
- YMEM_v70_i4_sS_COVER.indd — www.annemergmed.com · www.annemergmed.com
- [Prehospital treatment of tension pneumothorax in children- ... — pubmed.ncbi.nlm.nih.gov · pubmed.ncbi.nlm.nih.gov
- Tension Pneumothorax Managed Without Immediate ... — www.sciencedirect.com · www.sciencedirect.com