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Ohm's Law: I=V/R

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).

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Ohm's Law: I=V/R

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  1. 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) R = resistance to flow R P1

  2. Zone 1 PA>Pa>Pv Zone 2 Pa>PA>Pv Distance Zone 3 Pa>Pv>PA Blood Flow Pulmonary Circulation Arterial (Pa) Alveolar (PA) Venous (Pv)

  3. 1 2 3 Assumes PA=0 mmHg

  4. Pulmonary Artery Pulmonary Circulation 60 Pulmonary Arterial 50 Catheter Tracing 40 mmHg 30 20 10 0 Left Atrial Pressure Tracing Pulmonary Capillaries Left Atrium Pulmonary Vein

  5. Distal component 100 Bi-exponential decay of pulmonary arterial pressure PCWP Pressure (mmHg) 10 Proximal component 1 0 1 2 3 Time (seconds)

  6. Venule Arteriole Interstitial Hydrostatic P=1 Pnet=(Pi-Po)+(:o-:i) 17 mmHg Oncotic P=25 37 mmHg

  7. Zone 1 PA>Pa>Pv Zone 2 Pa>PA>Pv Zone 3 Pa>Pv>PA Pulmonary Circulation Arterial (Pa) Alveolar (PA) Venous (Pv)

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