Ticontrol - Inspiratory Time Control - ResMed VPAP ST-A User Manual

TiControl – Inspiratory Time Control
™
Unique to ResMed bilevel devices, TiControl allows the clinician 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 'window of opportunity' 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 maximising synchronisation
by effectively intervening to limit or prolong the inspiratory time when required. This ensures
synchronisation 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 Ttot = 60/BPM
(BPM)
10 6
15 4
20 3
25 2.4
30 2
35 1.7
40 1.5
Patient flow
Pressure
I:E = 1:2
(sec) (Reference)
2
1.3
1.0
0.8
0.7
0.6
0.5
Ti Max
Ti Min Cycle
Window
Sufficient inhalation time
I:E = 1:1
Ti Min
1.0
1.0
0.8
0.7
0.6
0.5
0.5
Secure
exhalation
I:E = 1:3
Ti Max Ti Max
2.0 1.5
2.0 1.3
1.5 1.0
1.2 0.8
1.0 0.7
0.8 0.7
0.7 0.7
time
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