Page 725 - Clinical Application of Mechanical Ventilation

Appendix 1 691

D. COmPLIANCE: DYNAmIC (C DYN )

EQUATION
DV
C DYN =
DP
C DYN : Dynamic compliance in mL/cm H O
2
DV : Corrected tidal volume in mL
DP : Pressure change (Peak inspiratory pressure 2 PEEP) in cm H O
2
NORMAL VALUE
30 to 40 mL/cm H O
2
If the patient is intubated, use serial measurements to establish trend.

EXAMPLE
Given: DV 5 500 mL
Peak inspiratory pressure 5 30 cm H O
2
PEEP 5 10 cm H O
2
Calculate the dynamic compliance.
DV
C DYN =
DP
500
=
30 - 10
500
=
20
= 25 mL/cm H O
2
E. COmPLIANCE: STATIC (C )
ST
EQUATION
DV
C ST = DP

C : Static compliance in mL/cm H O
2
ST
∆V : Corrected tidal volume in mL
∆P : Pressure change (plateau pressure 2 PEEP) in cm H O
2
NORMAL VALUE
40 to 60 mL/cm H O
2
If the patient is intubated, use serial measurements to establish trend.

EXAMPLE
Given: ∆V 5 500 mL
Plateau pressure 5 20 cm H O
2
PEEP 5 5 cm H O
2
Calculate the static compliance.
DV
C ST = DP

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