Ti Min and Ti Max
In S, ST, and VAuto modes, the minimum Ti limit is set via the Ti Min setting. The maximum Ti limit is set via the Ti Max setting.
To guide clinicians, the following table defines Ti Max and Ti Min values that best correspond to the patient’s respiratory rate and inspiration and expiration ratio, depending on the respiratory conditions.
Examples:
I:E = 1:1 – Ti Min prevents the premature cycling to EPAP for patients whose inspiratory effort is poor.
I:E = 1:3 – Ti Max limits the inspiration time for patients who require longer expiration times.
Patient breath (BPM)
TTot=60/
BPM (sec)
Inhalation time (sec)
I:E = 1:2 (Reference)
Sufficient inhalation time
I:E = 1:1
Secure exhalation time
1:E =1:3
Ti Min
Ti Max
Ti Max
10
6
2
1.0
2.0
1.5
15
4
1.3
1.0
2.0
1.3
20
3
1.0
0.8
1.5
1.0
25
2.4
0.8
0.7
1.2
0.8
30
2
0.7
0.6
1.0
0.7
35
1.7
0.6
0.5
0.8
0.7
40
1.5
0.5
0.5
0.7
0.7