Page 79 - Color Atlas Of Pathophysiology (S Silbernagl Et Al, Thieme 2000)

A. Dead Space (VD), Alveolar Volume (VA) and Tidal Volume (VT)
Tidal Dead space Tidal volume
volume (VT)
Dead
space (VD)
Alveolar proportion No alveolar
of VT (VA) ventilation

Ventilation, Perfusion
VD
VT
VA

VA = VT – VD VD > VT V T = V D
B. O 2 and CO 2 of Arterial Blood in Abnormal Ventilation
Hyper- Hypo- Hypo- Hyper-
ventilation ventilation ventilation ventilation
Plate 4.2
15 10 7 (L/min) 4.5 4.5 (L/min) 7 10 15

Severe
Normal
[CO 2 ] blood Normal Hypercapnia [HbO 2 ] blood practically unchanged
hypercapnia
HbO 2
Hypocapnia Severe
hypoxia
5 10 5 10 15
P CO 2 blood (kPa) P O 2 blood (kPa)
C. CO 2 Release and O 2 Uptake at Different Perfusion Levels
Minor effect Marked effect
on CO 2 output on O 2 uptake
Normal
CO 2 output Normal O 2 uptake

3 6 L/min 9 12 3 6 L/min 9 12
Reduced Increased Reduced Increased
perfusion perfusion perfusion perfusion 69

Silbernagl/Lang, Color Atlas of Pathophysiology © 2000 Thieme
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