Chapter 3
3-22
BiPAP Vision Service Manual © Respironics, Inc.
1062788
Theory of Operation
breath, and a timed trigger does not occur. The timer resets, and if a 6-second
interval elapses without a spontaneous trigger, a timed breath is triggered and
the ventilator delivers a timed breath (IPAP delivered for 6 seconds).
Figure 3-9: Timed Breath Example
3.7.3
Proportional Assist Ventilation / Timed Mode (PAV/T)
PAV/T incorporates some features of S/T mode and is a software enhancement
only. The appropriate
BiPAP Vision Clinical Manual
describes
PAV/T in detail.
Pressure (cmH
2
O)
Time (sec)
20
10
0
12
6
18
24
1
1
2
1
Time interval exceeds
Rate setting (approx.
6 sec)
Time (sec)
1500
1000
0
12
6
18
24
Volume (mL)
500
1
1
2
1
1 = Spontaneous-triggered pressure support breath
2 = Time-triggered pressure-limited, time-cydled breath
