What does the rise time in noninvasive ventilation determine?

The rise time in noninvasive ventilation is critical as it determines the time taken for the ventilator to reach the set inspiratory pressure during the initiation of each breath. This factor is essential for ensuring patient comfort and effective ventilation. A suitable rise time can help reduce the work of breathing and minimize any potential discomfort associated with abrupt pressure changes.

By allowing a controlled ramp-up to the target pressure, the ventilator can more gently transition the patient into the desired breathing support level. An appropriately adjusted rise time can improve synchrony between the patient’s efforts and the ventilator, ultimately resulting in a more effective and tolerable therapy. If the rise time is too fast, it may not provide adequate comfort, whereas a rise time that is too slow can lead to inadequate ventilation and potentially worsen the patient’s condition.