624074/07 B-23
B.5.5 nCPAP-PS mode
B.5.5.1 Introduction
NOTE:
For nCPAP-PS the position of the flow sensor is at
the expiratory valve. The correct set-up is shown in
Figure 2-13.
The nasal Continuous Positive Airway Pressure – Pressure
Support (nCPAP-PS) mode is designed to apply CPAP and inter-
mittent positive pressure support over a nasal interface (mask
or prongs). The pressure support Psupport can alternatively be
set to zero. When set to zero, the patient’s oxygenation is
fostered over the PEEP and the FiO
2
. Ventilation is performed
by the patient by inhalation and exhalation from the base flow.
As with the PSIMV mode, nCPAP-PS delivers a preset Psupport
pressure, but does not guarantee a fixed tidal volume, espe-
cially during changes in respiratory system compliance, airway
resistance, AutoPEEP, or the patient’s respiratory activity.
If the patient triggers a breath during a portion of the breath
interval, the ventilator immediately delivers a spontaneous
breath (Figure B-16). If the patient does not trigger an inspira-
tion during this time, the ventilator initiates a mandatory
breath at the end of t
imv
.
Figure B-16. Breath timing in nCPAP-PS
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