BiLEVEL S — BiLevel S (Spontaneous)
Two pressure levels — higher on inspiration, lower on expiration — fully patient-triggered.
Waveform
How it works
- A two-level positive airway pressure mode in which the patient starts and ends every breath spontaneously.
- Inspiratory Pressure (IPAP) is applied during inspiration and Expiratory Pressure (EPAP) during expiration.
- The device switches between IPAP and EPAP in response to the patient’s breathing.
- The respiratory rate is set by the patient; no mandatory breaths are delivered by the device.
Physiological basis
The IPAP–EPAP difference provides ventilatory support. It increases tidal volume and alveolar ventilation, while the lower pressure during expiration improves patient comfort and reduces the work of breathing.
Adjustable parameters 8
Pressure level applied during inhalation.
Pressure level applied during exhalation.
Sets how quickly pressure rises to the inspiratory pressure.
Sets how quickly pressure transitions to the expiratory pressure.
Sensitivity required for the patient to trigger inspiration.
Sensitivity required to cycle from inspiration to expiration.
Applies 1.5× the inspiratory pressure once every 20 breaths.
Comfort feature that eases the pressure at the start of exhalation.