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Chapter 13
13-66 Respironics V200 Ventilator Operator’s Manual REF 1057983 A
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Dynamic Resistance
Dynamic resistance is calculated using this equation.
Where:
n = Number of samples taken during for the calculation
i = Sample number
Q
i
= Patient flow
V
i
= Lung volume for the /
th
sample number
P
i
= Pressure sensor measurement for the /
th
sample number
Static C and R
Static C and R are calculated using these equations:
Where:
R
L
Q
i
V
i
∗
P
i
V
i
P
i
Q
i
∗
V
i
i 0=
n
∑
i 0=
n
∑
–
i 0=
n
∑
i 0=
n
∑
Q
i
V
i
i 0=
n
∑
2
Q
i
2
∗
i 0=
n
∑
V
i
2
i 0=
n
∑
–
------------------------------------------------------------------------------------------------=
Q
i
∗
td
∫
=
C
L
V
P
eplat
P
0
–()
--------------------------------=
CR
L
P
ei
P
eplat
PV
plat
C
L
⁄–()–()
Q
Lend
------------------------------------------------------------------------=