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一、血压的形成 所谓血压,就是指血液在血管里流动时对血管壁所造成的侧压力。它是诸多因素即血流动力变数(心输出量和总周围阻力)相互作用的综合结果。这些动力变数相互关系平衡失调.即导致血压的改变,使血压升高或降低。收缩压反映心脏收缩的速度、强度、主动脉弹性、心输出量和动脉容量;而舒张压主要反映血液流出时所遇到的阻力。不仅动脉系统与血压关系密切.而且毛细血管和静脉系统也与之关系密切。静脉系统为容量血管,具有高度的可扩张性.它决定着回心血量的多寡,故对心输出量起重要调节作用,从而明显地影响着血压的变化。
First, the formation of blood pressure The so-called blood pressure, refers to the blood flow in the blood vessels caused by lateral pressure on the vessel wall. It is a combined result of a number of factors, namely the interaction of the hemodynamic variables (cardiac output and total peripheral resistance). These dynamic variables are imbalanced in their interrelations, leading to changes in blood pressure that raise or lower blood pressure. Systolic pressure reflects the rate of contraction of the heart, strength, aortic elasticity, cardiac output and arterial capacity; and diastolic blood pressure mainly reflects the resistance encountered when blood flow out. Not only the arterial system is closely related to blood pressure, but also the capillary and venous system. Venous system for the capacity of blood vessels, with a high degree of expansibility.It determines the amount of blood back to the heart, it plays an important role in the regulation of cardiac output, which significantly affects the changes in blood pressure.