动脉血压的测量原理 (插图) Cuff pressure >120 Vessel viall Blood flow Cuff pressure 80 Vessel wall Constr iction Blood flow FIGURE 21-7. Measurement of arterial blood pressure with a sphygmomanometer. A, If the patient's arterial blood pressure is 120 /80 mm Hg, the pressure(oblique line) in a cuff around the patient's arm is allowed to fall动脉血压的测量原理: （插图)