Which modality provides noninvasive positive-pressure ventilation?

• A. Endotracheal tube
• B. Incentive spirometry
• C. BiPAP (noninvasive positive pressure ventilation)
• D. CPAP with nasal mask

Answer: (C)

Noninvasive positive-pressure ventilation is about delivering pressurized air to support a patient’s own breaths without an artificial airway. BiPAP does this by giving two pressure levels: a higher inspiratory pressure during inhalation and a lower expiratory pressure during exhalation. This setup actively augments ventilation, increases tidal volume, reduces the work of breathing, and improves CO2 removal, all through a mask or similar interface without an endotracheal tube. An endotracheal tube is invasive, so it doesn’t meet the noninvasive criterion. Incentive spirometry is a lung-expansion therapy, not a mode of positive-pressure ventilation. CPAP with a nasal mask provides continuous pressure to keep airways open and aid oxygenation, but it doesn’t actively assist each breath like BiPAP does, which is why BiPAP is the modality that explicitly provides noninvasive positive-pressure ventilation.