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REF 1057983 A Respironics V200 Ventilator Operator’s Manual 13-65
Chapter 13
Compliance (C) and
Resistance (R)
Computations
Dynamic C and R are estimated during ventilator and operator initiated
breaths. Static C and R are estimated during a
Static C and R maneuver.
Dynamic Compliance
Dynamic compliance is calculated using these equations:
Peak lung flow
(Peak L-Flow)
The maximum measured inspiratory flow at the patient wye. Available in
VCV and PCV.
Peak L-Flow is displayed in LPM.
Dynamic
compliance and
resistance
An estimation of the compliance and resistance of the patient’s lungs, using
the Least Square Estimation algorithm on the equation of motion (P = R • Q
+ V /C, where Q = lung flow and V = lung volume), performed during each
machine or operator initiated inspiration.
Dynamic compliance is displayed in mL/cmH
2
O. Dynamic resistance is
displayed in cmH
2
O/L/s. All compliance and resistance values are estimated
on time or operator triggered mandatory breaths only. If there were no
machine or operator initiated breaths within the last one minute, - - - - is
displayed.
These alarms interrupt dynamic compliance and resistance updates: Corrupt
Compliance, Corrupt Altitude, High Pressure, Low Insp pressure, Air Source
Fault, O2 Valve stuck closed, Exh Valve stuck open, Low Tidal volume, Low
PEEP.
Dynamic compliance values from 0 to 350 mL/cmH
2
O and dynamic
resistance values from 0 to 400 cmH
2
O/L/s are displayed: (If either value is
above its limit, only + + + is displayed. If either value is below its limit, only
- - - is displayed.)
Parameter Description
Table 13-9: Respiratory Mechanics Maneuver Summary and Data Specifications
C
L
Q
i
V
i
i 0=
n
∑
2
Q
i
2
∗
i 0=
n
∑
V
i
2
i 0=
n
∑
–
Q
i
V
i
∗
P
i
Q
i
P
i
V
i
∗
V
i
i 0=
n
∑
i 0=
n
∑
–
i 0=
n
∑
i 0=
n
∑
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