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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.

Primary spontaneous pneumothorax

Respiratory · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

RapidFull
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Escalate

Haemodynamic compromise, severe hypoxaemia, rapidly worsening breathlessness or clinical tension is not a routine PSP decision: give emergency oxygen/resuscitation and decompress immediately without waiting for radiography when instability or severe respiratory compromise is present.

Synopsis

Diagnose primary spontaneous pneumothorax, identify high-risk features and choose conservative, ambulatory or invasive management according to symptoms, physiology, safety and patient preference.

  • PSP means spontaneous pleural air without known clinically apparent underlying lung disease; actively look for secondary disease rather than assuming it from age or body habitus alone.
  • Confirm a stable suspected pneumothorax with chest radiography and use thoracic ultrasound/CT when needed; tension physiology is a clinical diagnosis and imaging must not delay decompression.
  • BTS 2023 makes symptoms and physiological risk—not size alone—the main acute-management decision.
  • Conservative management can be considered for asymptomatic or minimally symptomatic PSP with no physiological compromise, regardless of radiographic size, provided follow-up and return access are reliable.
  • Ambulatory management should be considered for appropriate PSP when expertise, a defined device pathway, daily/early review and patient support are available.
  • When conservative or ambulatory care is unsuitable, needle aspiration or small-bore tube drainage are initial options chosen by symptoms, risk, safe access and patient preference.
  • High-risk characteristics include haemodynamic compromise/tension, significant hypoxia, bilateral pneumothorax, underlying lung disease, age at least 50 with significant smoking history and haemopneumothorax.
  • All non-admitted patients need written red flags, direct return access and planned respiratory follow-up; BTS advises review after conservative/needle management in about 2–4 weeks.
  • Discuss recurrence prevention after a second ipsilateral or first contralateral pneumothorax, and earlier when recurrence would be hazardous, such as prior tension or high-risk occupation.
  • Advise smoking cessation. Do not fly until complete radiographic resolution and then wait at least 7 days; scuba diving is generally contraindicated unless definitive preventive treatment and specialist diving assessment support return.

    • Key red flags

    Tension physiology

    Severe distress, hypotension, tachycardia, cyanosis, altered consciousness, raised JVP or peri-arrest deterioration with unilateral reduced breath sounds; tracheal deviation is late and absence does not reassure.

    Significant hypoxia/bilateral disease

    Marked desaturation or bilateral pneumothoraces reduce reserve and are high-risk features requiring inpatient intervention/specialist care.

    Possible secondary pneumothorax

    Known COPD, asthma, ILD, cystic fibrosis, infection or malignancy—or age at least 50 with significant smoking—moves management toward the higher-risk pathway.

    Haemopneumothorax

    Pleural air plus fluid level, anaemia or shock suggests bleeding and requires urgent drainage and thoracic surgical involvement.

    Investigation priorities

    01
    Chest X-rayFirst step

    Confirm pleural air, laterality and approximate extent in a stable patient.

    Management branches

    ConservativeMinimal symptoms, no compromise

    Asymptomatic or minimally symptomatic PSP with no significant pain/breathlessness, no physiological compromise and reliable follow-up.

    1. Confirm diagnosis in a stable patient, assess all high-risk characteristics and provide appropriate analgesia; discuss that size alone does not mandate intervention.
    2. Observe long enough to establish clinical stability and safe mobilisation; supply written red flags and a direct route back for increasing pain, breathlessness, dizziness or syncope.
    3. Arrange respiratory follow-up and repeat radiography, commonly at 2–4 weeks after conservative/needle management; give smoking, flying and diving advice.
    AmbulatorySymptom relief without routine admission

    Symptomatic PSP without instability where ambulatory expertise/device pathway, support and follow-up are available.

    1. Discuss ambulatory one-way-valve treatment versus aspiration/drain/conservative care, including pain, device failure and possible admission.
    2. Insert/manage the approved ambulatory device under ultrasound-informed pleural technique, confirm safe function and provide 24-hour contact/return instructions.
    3. Review through the dedicated pathway—often daily or at the device protocol interval—until air leak ceases and radiographic/clinical resolution allows removal.

    Key medicines

    Paracetamol1 g orally every 4–6 hours as needed, maximum 4 g in 24 hours for a typical adult; use a lower maximum in body weight below 50 kg, liver disease, malnutrition or heavy alcohol use.Check combination products and total daily dose. Severe or escalating pain despite treatment may signal tension, bleeding or device complication and needs reassessment.
    Ibuprofen200–400 mg orally up to three times daily with food for the shortest necessary course when an NSAID is appropriate.Avoid or use specialist judgement with renal injury, peptic ulcer/bleeding, anticoagulation, NSAID-sensitive asthma, pregnancy or heart failure.
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    Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending+
    Sources

    Sources and review status

    National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

    • BTS Guideline for Pleural Disease 2023Current symptom-led PSP management and recurrence recommendations.
    • BTS pneumothorax acute-management evidence reviewConservative, ambulatory, aspiration, drain and surgical evidence.
    • BTS pleural disease clinical pathwaysHigh-risk characteristics and pathway decisions.
    • BTS Quality Standard for Pleural Disease 2026Current PSP preference, prolonged leak and recurrence standards.
    • BTS Clinical Statement on air travelFlying advice after pneumothorax.

    Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

    Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom