Page 724 - Clinical Application of Mechanical Ventilation

690 Appendix 1

NORMAL VALUE
CO 5 4 to 8 L/min

EXAMPLE
Given: Body surface area 5 1.6 m 2
Arterial O content 5 20 vol %
2
Mixed venous O content 5 15 vol %
2

O consumption
CO = 2
C O - C O 2
2
a
v
130 * BSA
=
C O - C O 2
2
a
v
130 * 1.6
=
20% - 15%
208
=
5%

208
=
0.05

54160 mL/min or 4.16 L/min

C. CEREBRAL PERFuSION PRESSuRE

EQUATION
CPP 5 MAP 2 ICP

CPP : Cerebral Perfusion Pressure
MAP: Mean Arterial Pressure
ICP: Intracranial Pressure

NORMAL VALUE
70 to 80 mm Hg

EXAMPLE
Calculate the CPP given the following data: MAP 5 90 mm Hg, ICP 5 14 mm
Hg. Is the calculated CPP within normal limits?

CPP 5 MAP 2 ICP
590 mm Hg 214 mm Hg
576 mm Hg

CPP is within normal limit of 70 to 80 mm Hg

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