Contraindications to BiPAP
BiPAP should be withheld from patients with pneumothorax as long as the pneumothorax is present 1. This is the most clearly established absolute contraindication based on guideline-level evidence.
Absolute Contraindications
Active Pneumothorax
- BiPAP must be discontinued in any patient with pneumothorax, regardless of size 1
- The positive pressure can cause progression of the pneumothorax and worsen the complication
- BiPAP should remain withheld for the entire duration that the pneumothorax is present
- Important caveat: Some patients with severe obstructive airways disease may depend on BiPAP for ventilatory support. In these cases, observation in the intensive care unit may be appropriate when withholding BiPAP, as the patient may deteriorate without the support 1
Massive Hemoptysis
- BiPAP should be withheld from patients with massive hemoptysis 1
- The positive pressure may disrupt clot formation at bleeding sites and worsen hemorrhage
- For patients with scant hemoptysis, BiPAP should NOT be withheld - the risks of continuing BiPAP do not outweigh its benefits in this scenario 1
- For mild-to-moderate hemoptysis, the evidence is equivocal and clinical judgment is required 1
Relative Contraindications (Based on General Medical Knowledge)
Inability to Protect Airway
- Patients who cannot protect their airway due to:
- Altered mental status or decreased level of consciousness
- Inability to clear secretions
- Impaired gag or cough reflex
- These patients require invasive mechanical ventilation instead
Facial Trauma or Anatomical Barriers
- Severe facial trauma preventing adequate mask seal
- Recent facial, upper airway, or upper gastrointestinal surgery
- Fixed upper airway obstruction
Hemodynamic Instability
- Severe hypotension or shock requiring immediate intubation
- Cardiac arrest or peri-arrest state
Gastrointestinal Issues
- Active vomiting (risk of aspiration)
- Bowel obstruction
- Recent esophageal surgery
Special Populations
Heart Failure with Central Sleep Apnea
- Adaptive servo-ventilation (a form of positive pressure therapy) causes harm in patients with NYHA class II-IV heart failure with reduced ejection fraction and central sleep apnea 2
- Standard BiPAP may be used cautiously in acute pulmonary edema, where early application (within 1 hour) significantly reduces emergency room length of stay 3
Clinical Monitoring Requirements
When BiPAP is initiated, patients require:
- Close monitoring with ability to perform endotracheal intubation if the patient fails to improve or rapidly deteriorates 4
- Assessment within 1-2 hours to determine if condition is improving or worsening 5
- If no improvement or deterioration occurs within this timeframe, proceed to invasive mechanical ventilation 5
Common Pitfall
Denture dislodgement: Remove dentures before initiating BiPAP, as they can become dislodged and impacted in the hypopharynx, compromising airway patency 6. This adverse event is often overlooked in patients with coexisting respiratory disease.