phyrev ch.7 - Ch. 16 Hemodynamics Pulsatile flow Results...

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Ch. 16 Hemodynamics Pulsatile flow –Results from cardiac contractions Phasic flow – results from respiration Flow – volume of a moving fluid Velocity – the speed or swiftness of a moving fluid Laminar Flow – flow streamlines are aligned and parallel, may have parabolic or plug patterns Turbulent Flow – chaotic flow, associated with cardio pathology and increased velocities, ie. Eddy currents Reynold’s Number – a UNITLESS number indicating laminar or turbulent flow, less than 1500 = laminar Energy – blood flows when the total fluid energy at one location differs from the total fluid energy at another location called an energy gradient . Stenosis – a narrowing in a lumen Causes: changes in flow direction, increased velocity, turbulence at exit, pressure gradient Hydrostatic pressure – equals the weight of blood pressing on the vessel from heart level to the point of measurement. When pt is supine, hydrostatic pressure is zero at all locations. - hydrostatic pressure at the ankle is most affected by the pt height Breathing and Venous Flow – low pressure system Inspiration – Diaphragm presses into the abdomen, pressure in abd cavity increases, thorax decreases Expiration – Diaphragm presses into the thorax, pressure in abd cavity decreases,
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phyrev ch.7 - Ch. 16 Hemodynamics Pulsatile flow Results...

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