H-1.601. 00137-B3.0
Page 41 of 81
• P-A/CV
P-A/CV (Pressure Assisted/Controlled Ventilation) is based on VCV.
Synchronous trigger is enabled in expiration stage. When the pressure
reaches activation pressure, respirator provides one push of PCV at fixed
Inspiratory pressure in advance.
A typical pressure waveform of P-A/CV is shown below：
FIGURE 29 P-A/CV
Sign means a deep inhalation at two times of tidal volume based on IPPV
once every certain times, which is suitable for patient in long-term need of
mechanical ventilation.
Caution：
Sign can be applied only based on V-AC, but not independently.
5.5.3 V-SIMV and P-SIMV
SIMV
SIMV (Synchronized Intermittent Mandatory Ventilation) is a ventilation
technology combining spontaneous breathing with IPPV, ensuring effective
ventilation to the patient, free of patient-ventilator asynchrony. Proper
adjustment can be made to SIMV frequency and flow rate to facilitate
patient's respiratory function. Clinically SIMV has become a necessity prior to
withdrawal of ventilator.
In V-SIMV (Volume-Constant
Synchronized Intermittent Mandatory Ventilation), within a specific
activation window, ventilator detects patient's respiratory effort based on
preset trigger sensitivity and immediately gives a push of mandatory
ventilation at preset tidal volume so as to synchronize delivery of mandatory
ventilation with patient's inhaling effort. During duration of activation
window, if patient is capable of activating ventilator, an assisted breath will
be given; if not, a push of mandatory ventilation will be provided.
To Next Page
Loading...