TiControl - Inspiratory time control
Available in: VAuto, S and ST modes only.
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 maximizing synchronization by effectively intervening to limit or prolong the inspiratory time when required. This ensures synchronization, even in the presence of significant mouth and/or mask leak.
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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.
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) | Ttot = 60/BPM (sec) | I:E = 1:2 (Reference) | Sufficient inhalation time I:E = 1:1 | Secure exhalation time I: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 |
Leak management with VSync
Using ResMed's VSync algorithm, the AirCurve 11 VPAP Tx device monitors and compensates for leak by continuously and automatically adjusting the baseline flow. This enables reliable delivery of therapy pressure while maintaining patient-device synchrony.