How does CPAP primarily support the patient during respiration?

CPAP, or Continuous Positive Airway Pressure, fundamentally supports the patient during respiration by applying a constant pressure throughout the entire breathing cycle. This steady airflow helps keep the airways open, preventing collapse, especially during exhalation. By maintaining this constant pressure, CPAP enhances oxygenation by increasing functional residual capacity (FRC) and improving ventilation-perfusion matching.

This method is especially beneficial for patients experiencing conditions like obstructive sleep apnea or respiratory distress, as it reduces the work of breathing and enhances lung volume. The continuous pressure provides a baseline support that allows patients to breathe more comfortably and efficiently by ensuring that their airways remain patent throughout both inhalation and exhalation, ultimately leading to improved gas exchange and overall respiratory function.