Ticontrol - Inspiratory Time Control - ResMed S9 VPAP Series Clinical Manual

TiControl – Inspiratory time control
™
(S, ST and VAuto modes) Unique to ResMed CPAP and bilevel devices, TiControl allows you to set
minimum and maximum limits on the time the device spends in IPAP . The minimum and maximum time
limits are set at either side of the patient's ideal spontaneous inspiratory time, providing a 'controlled
period' for the patient to spontaneously cycle to EPAP .
The minimum time limit is set via the Ti Min parameter and the maximum time limit is set via the Ti Max
parameter.
TiControl's Ti Max and Ti Min parameters play a significant role in maximizing synchronization by
effectively intervening to limit or prolong the inspiratory time when required. Along with Vsync, this
ensures synchronization even in the presence of significant mouth and/or mask leak.
The following table is a guide to selecting the 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.
Notes:
• I:E = 1:1 – Ti Min prevents the premature cycling to EPAP for patients whose inspiratory effort is
extremely weak.
• I:E = 1:3 – Ti Max limits the inspiration time for patients who require a longer expiration time.
Patient breath
(BPM)
10
15
20
25
30
35
40
6
Patient flow
Pressure
Ttot = 60/BPM
(sec) (Reference)
6 2
4 1.3
3 1.0
2.4 0.8
2 0.7
1.7 0.6
1.5 0.5
Ti Max
Ti Min Cycle
Window
Sufficient inhalation time
I:E = 1:2
Ti Min
1.0
1.0
0.8
0.7
0.6
0.5
0.5
I:E = 1:1
Ti Max
2.0
2.0
1.5
1.2
1.0
0.8
0.7
Secure
exhalation
time
I:E = 1:3
Ti Max
1.5
1.3
1.0
0.8
0.7
0.7
0.7