Saadat Respina P1 User Manual page 72

Dual control:
Dual control is a feature in volume modes (VCV, V-SIMV) that allows the patient to receive
more volume than the set value if needed, in case of activation. If the patient triggers to
breathe during inhalation and causes a drop in pressure, the volume control is temporarily
changed to pressure control.
Dual Control increases device compatibility with the patient and reduces work of breathing.
The condition for changing from volume control to pressure in a square flow is a pressure
drop of more than 2 cmH2O or a pressure drop below PEEP but in a decelerating flow, only
the pressure drop below the PEEP cause the changing into the pressure control.
The condition for returning from pressure control to volume in the same respiration is to
reduce the flow to the initial value (flow applied due to device settings).
It should be noted that the start of the inhalation phase in each respiratory cycle, will always
be with volume control due to the choice of volume mode.
Example: If Ti = 2.0 s and Vt = 1200 ml are set, the device applies 36 L/min during
inhalation. In the first cycle, Dual Control is inactive and it is observed that the volume of
about 1200 ml has been transferred and the patient's trigger has not been responded by the
device. In the second cycle, with the activation of Dual Control, the patient's trigger, which
has led to a drop in pressure of more than 2 cmH2O, is detected by the device and responded
by switching to the pressure control. For this reason, a volume of about 1450 ml has been
delivered to the patient. In this example, because the flow rate has dropped to 36 liters per
minute before the end of inhalation, the device has returned to volume control.
Figure 8-2- Dual control

PCV (Pressure Controlled Ventilation)
In this mode the user sets Pcontrol, Respiratory Rate and Inspiratory time (Ti). The ventilator
should maintain the airway pressure on Pcontrol during inspiratory time.
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