Is a pulmonary bleb (or bullae) a contraindication to bilevel positive airway pressure (BiPAP) therapy?

Is a Bleb a Contraindication to BiPAP?

A pulmonary bleb or bulla is NOT an absolute contraindication to BiPAP, but an active pneumothorax IS a contraindication. The critical distinction is between the presence of blebs/bullae alone versus an actual pneumothorax.

Key Clinical Distinction

The evidence clearly separates two scenarios:

Blebs/Bullae Without Pneumothorax

• Blebs and bullae alone do not contraindicate BiPAP use 1
• There is only a single case report of recurrent pneumothorax in a patient with subpleural blebs on BiPAP, and this was in a non-Duchenne muscular dystrophy patient 2
• This represents extremely limited evidence of actual risk

Active Pneumothorax

• BiPAP should be withheld from patients with pneumothorax as long as the pneumothorax is present 1
• This recommendation applies regardless of pneumothorax size
• The concern is that positive pressure ventilation may cause progression of the pneumothorax through breath stacking, air trapping, and barotrauma 3

Clinical Algorithm

When encountering a patient with blebs/bullae:

1. Obtain chest imaging to rule out active pneumothorax

   • If pneumothorax present → withhold BiPAP until resolved
   • If no pneumothorax → BiPAP can be used safely

2. If BiPAP is needed and blebs are present:

   • Monitor closely for signs of pneumothorax development
   • Consider ICU-level observation if high clinical concern 1
   • Watch for sudden deterioration, chest pain, or worsening respiratory status

3. If pneumothorax develops while on BiPAP:

   • Discontinue BiPAP immediately
   • Manage pneumothorax per standard protocols (chest tube if indicated)
   • Do not resume BiPAP until pneumothorax has resolved

Important Caveats

Context matters for hemoptysis patients: In cystic fibrosis patients with massive hemoptysis who are chronic BiPAP users, withholding BiPAP is acceptable management, though some experts express concern about withdrawing needed support 1. For scant hemoptysis, BiPAP should NOT be withheld 1.

The theoretical risk is low: Despite widespread use of BiPAP in patients with underlying lung disease (who often have blebs), documented cases of BiPAP-induced pneumothorax from blebs are exceedingly rare in the literature 2.

Positive pressure ventilation risks: When mechanical ventilation is required in patients with severe lung disease, breath stacking and auto-PEEP can lead to barotrauma and pneumothorax 3. However, this applies more to invasive ventilation than properly managed BiPAP.