Synopsis
Recognise secondary spontaneous pneumothorax as high-risk loss of lung volume in established lung disease, relieve physiological compromise promptly, and plan recurrence prevention with respiratory and thoracic expertise.
- Secondary spontaneous pneumothorax occurs without trauma in a person with underlying lung disease, commonly COPD, interstitial lung disease, cystic fibrosis, infection, malignancy or cystic lung disease.
- The same radiographic air rim causes more severe hypoxaemia and breathlessness than in primary pneumothorax because the remaining lung is already impaired.
- Pleuritic pain, sudden dyspnoea and unilateral reduced breath sounds are typical, but examination can be subtle in hyperinflated or fibrotic lungs.
- Tension is a physiological diagnosis of obstructive shock, not a measurement of pneumothorax size. Decompress immediately when clinical compromise is present.
- Use chest radiography to confirm and estimate a stable pneumothorax; CT helps distinguish a small pneumothorax from giant bullae or loculated air when uncertainty changes intervention.
- Most symptomatic or clinically important secondary pneumothoraces require admission and pleural intervention. Follow the current BTS decision pathway rather than a remembered size cutoff alone.
- Small-bore image-guided chest drainage is appropriate for many stable cases; choose site and device for anatomy, air leak, underlying disease and local expertise.
- Do not clamp a bubbling drain. Routine early suction is not automatically beneficial and can worsen re-expansion injury or air leak; use specialist direction.
- Persistent air leak, failure of re-expansion or recurrence needs early thoracic-surgical and pleural MDT discussion, with blood patch or endobronchial options when surgery is unsuitable.
- Smoking cessation, recurrence counselling, air-travel advice and occupation or diving restrictions are part of treatment, not discharge footnotes.
Key red flags
New unilateral pleuritic pain or breathlessness with a pleural line and absent peripheral lung markings in a person with established lung disease; oxygen need may exceed apparent radiographic size.
Hypotension, severe hypoxaemia, agitation or reduced consciousness, tachycardia and unilateral reduced ventilation indicate obstructive compromise. Tracheal deviation is late and not required.
Continued bubbling, failure of lung re-expansion or recurrent air after several days suggests a bronchopleural or alveolar–pleural fistula and requires early specialist planning.
A giant bulla may appear as a large lucent area and can be entered catastrophically by a drain; CT is valuable when the patient is stable and radiography is uncertain.
Recent biopsy, central-line insertion, ventilation or chest injury changes classification and may require a trauma or procedural pathway rather than spontaneous-pneumothorax algorithms.
Investigation priorities
Define immediate respiratory compromise and hypercapnic risk in the underlying lung disease.
Management branches
Pneumothorax is suspected with severe respiratory or haemodynamic compromise.
- Call for senior emergency and critical-care help, give high-concentration oxygen initially if critically ill, and monitor continuously.
- Perform immediate decompression using the locally approved technique and trained expertise; do not wait for a chest radiograph.
- Insert a definitive chest drain through the emergency pleural or trauma pathway and reassess circulation and ventilation.
- Look for precipitating positive pressure, underlying disease and contralateral pathology, then document the event and recurrence plan.
Imaging confirms secondary spontaneous pneumothorax without tension.
- Admit or observe in an appropriate monitored setting, prescribe oxygen to target and provide analgesia.
- Apply the current BTS pathway using symptoms, pneumothorax extent, underlying reserve and ability to access follow-up.
- Use an image-guided small-bore drain for most clinically important cases; ambulatory management requires a specialist service and selected patient.
- Repeat clinical assessment and imaging at the pathway interval, escalating immediately for increasing air, oxygen need or distress.