However increased pleural pressure (intrathoracic pressure) also can decrease Preload (venous return) which lowers Blood Pressure
Aorta and pulmonary artery diminish the rate of change of pressure and flow (dampen fluctuations in pulsatile flow)
Key force in ventricular emptying, but is not typically measurable
Peripheral vascular resistance
Small terminal vessels (primarily arterioles and capillaries) resist steady flow (non-pulsatile flow)
Vascular resistance increases (and flow decreases) with increasing blood viscosity (increased Hematocrit or dehydration)
Marino (2014) ICU Book, 4th Ed Wolters-Kluwer p. 159-66
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This page was written by Scott Moses, MD, last revised on 6/9/2014 and last published on 12/6/2017.