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8.5 ASV monitored data window
The ASV monitored data window (Figure C-5) provides
numeric target and actual parameters for tidal volume, fre-
quency, pressure, and minute ventilation.
See Appendix C, ASV, for detailed information on ASV, includ-
ing how to interpret the data in the monitored data window.
Pinsp (cmH2O) Inspiratory pressure, the target pressure (additional to
PEEP/CPAP) applied during the inspiratory phase (see
Table 7-1).
RSB (1/(l*min)) RSB measurement. Shown only if 80% of the last
25 breaths are spontaneous (see Table 7-1). Can be
configured on or off.
VariIndex
(%)
1
,
2
Variability index. Indicates variability of volume and
timing. The coefficient of variation (standard deviation/
mean) of the Vt/TI index. Calculated from the last
100 breaths. Updated breath by breath. Can be
configured on or off.
P0.1 (cmH2O)
3
P0.1 measurement. Shown only if pressure trigger is
active (see Table 7-1). Can be configured on or off.
%fSpont (%) Spontaneous breath percentage. The moving average
of the percentage of spontaneous breaths over the last
8 total breaths. Can be configured ON or OFF.
1. Defined by the coefficient of variation (CV = standard deviation/mean) of Vtinsp/Ti over
consecutive valid breaths. For adults, a CV > 19% for the VtI/TI has been associated
with successful weaning in 100% of cases. (Wysocki M. Crit Care Med 2006.)
2. The variability index (VariIndex) parameter is not available in the USA.
3. A P0.1 < the default value is likely associated with high respiratory drive and unsuccess-
ful separation from the ventilator.
Table 8-2. Vent status parameter
Parameter
(unit)
Definition
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