Which noninvasive ventilation strategy is described for hypercapnia?

• A. Immediate intubation.
• B. BiPAP.
• C. Nebulized saline.
• D. Oxygen via nasal cannula.

Answer: (B)

Noninvasive ventilation for hypercapnic respiratory failure works by providing positive pressure to support ventilation without an endotracheal tube. The best choice for this scenario is BiPAP, which delivers two levels of pressure: a higher inspiratory pressure to boost tidal volume and drive out CO2, and a lower expiratory pressure to keep airways open and help oxygenation. This combination reduces the work of breathing and improves alveolar ventilation, often correcting elevated CO2 and avoiding the need for invasive intubation.

Immediate intubation is invasive mechanical ventilation, which goes beyond noninvasive support. Nebulized saline helps with airway hydration and mucus clearance but does not address ventilation or CO2 elimination. Oxygen via nasal cannula provides supplemental oxygen only and may not adequately reduce hypercapnia.