Page 4, Hemodynamics, Dr. D. Penney


Pressure (continued..)

Thus, where perfusion pressure is primarily responsible for moving the blood from one place to another in the circulatory system, transmural pressure is responsible for stretching vascular components.

Are you measuring transmural pressure or perfusion pressure, for example, when you determine blood pressure in the arm with a cuff, stethoscope, and sphygmomanometer? The answer of course is transmural pressure! To measure perfusion pressure you have to measure transmural pressures at two different points in the circulation; for example, at the brachial artery and then at a vein which is returning blood to the heart. The difference between the two values yields the perfusion pressure. [SEE MISCONCEPTION 11]



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