Table of Contents
Advertisement
When the operator adjusts the parameters of a respiratory mode, he/ she is faced with
limitations in setting the upper and lower limits of these parameters, which are due to the
adjustment of other respiratory parameters.
Note:
During inhalation, if the airway pressure for any reason (such as the patient's cough) exceeds
the value specified for it, the exhalation valve opens and prevents further increase in pressure.
The flow and pressure curve in PSV mode is shown in the below figure. As you can see when
the patient respiratory effort is detected, the ventilator delivers a pressure supported breath to
assist the patient spontaneous breath (in PEEP condition, PEEP+ Psupport).
Adjustable parameters in this mode are:
Parameter
O
2
PEEP
P
support
Trigger
F Trig/ P Trig
% Esens
Rise Time
APRV (Airway Pressure Release Ventilation)
APRV is a pressure-based ventilation mode that allows patients to breathe spontaneously at
two user-selected pressure levels (Phigh, Plow).
Figure 8-6- Pressure and flow curve in PSV mode
Percentage of delivered oxygen to the patient
Positive end expiratory pressure
Pressure more than PEEP that applies to spontaneous breaths.
The method of detecting the patient's respiratory effort (flow or pressure).
Threshold of detecting patient respiratory effort based on flow or pressure
Percentage of peak inspiratory flow in spontaneous breath necessary to
inhalation
terminate
and initiate exhalation.
Time required for inspiratory pressure to rise to set pressure
Definition
80
Advertisement
Table of Contents
