Saadat Respina P1 User Manual page 81

Thigh and Tlow determine the duration of exposure to each pressure levels. The device is in
the inhalation phase during Thigh and in the exhalation phase duting Tlow. The minimum
possible time for Thigh is one second and the maximum possible time for Tlow is two
seconds.
Note:
The patient is not allowed to trigger the device at the low pressure level.
Auto Tlow parameter:
By setting the Auto Tlow parameter, the duration of stay at low pressure level can be related
to changes in expiratory flow. In this case, the low pressure time continues until the
expiratory flow reaches a certain level of the expiratory flow peak.
Example: In the following figure, in the first cycle, Auto Tlow = off and Tlow = 1.2 s are set.
It is observed that the exhalation lasts 1.2 s. In the second cycle, Auto Tlow is changed to
75% by the user, and because the peak expiratory flow rate has been 100 L/min, when the
expiratory flow reaches 75 L/min, the low pressure time terminates:
(PFe * Auto Tlow= 100 * 0.75= 75)
Figure 8-7- Pressure and flow curves in APRV mode with adjustable Auto Tlow
Note:
If the user sets the Auto Tlow value other than off, the set Tlow value is set by the user as the
maximum low level presseure time (in this case this parameter is displayed as Tlow Max).
This is important when the expiratory flow peak is not detected for any reason or the
expiratory flow rate is greatly reduced due to the patient's physiological condition.
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