Dynamic resistance, Static c and r – Philips V200 User Manual
Page 230
Chapter 13
13-66
Respironics V200 Ventilator Operator’s Manual
REF 1057983 A
Options and Accessories
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
∗ t
d
∫
=
C
L
V
P
eplat
P
0
–
(
)
--------------------------------
=
CR
L
P
ei
P
eplat
PV
plat
C
L
⁄
–
(
)
–
(
)
Q
Lend
------------------------------------------------------------------------
=