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P. 2. Q. Ohm's Law: I=V/R. I = current (electrical flow). V= voltage (electrical potential energy). R = resistance to flow. For fluid dynamics: Q=P/R. Q = blood flow. P = pressure (potential energy). - PowerPoint PPT Presentation
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Ohm's Law: I=V/R I = current (electrical flow)
V= voltage (electrical potential energy)
R = resistance to flow
For fluid dynamics: Q=P/R Q = blood flow
P = pressure (potential energy)
R = resistance to flow
P1
Q
R
P2
Arterial (Pa)
Venous (Pv)
Alveolar (PA)
Zone 1
PA>Pa>Pv
Zone 2
Pa>PA>Pv
Zone 3
Pa>Pv>PA Blood FlowD
ista
nce
Pulmonary Circulation
1
2
3
Assumes PA=0 mmHg
Pulmonary Artery
Pulmonary Capillaries
Pulmonary Vein
LeftAtrium
0
10
20
30
40
50
60
mm
Hg
Pulmonary ArterialCatheter Tracing
Left Atrial Pressure Tracing
Pulmonary Circulation
0 1 2 31
10
100
Distalcomponent
Proximalcomponent
PCWP
Bi-exponential decay ofpulmonary arterial pressure
Pre
ssu
re (
mm
Hg)
Time (seconds)
Arteriole Venule
37 mmHg
17 mmHg
InterstitialHydrostatic P=1
Oncotic P=25
Pnet=(Pi-Po)+(o-i)
Arterial (Pa)
Venous (Pv)
Alveolar (PA)
Zone 1
PA>Pa>Pv
Zone 2
Pa>PA>Pv
Zone 3
Pa>Pv>PA
Pulmonary Circulation