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血管内容量分成两部分,一部分是非张力性容量,也是应激储备容量;另一部分是张力性容量,后者是产生静脉回流(VR)趋动压的物质基础。张力性容量与非张力性容量在一定条件下可以相互转换。目前不能通过任何监测装置测量非张力性容量,张力性容量可以通过测量平均体循环充盈压(Pmsf)间接反映。根据VR=(Pmsf-Pra)/静脉血管阻力公式,提高Pmsf可有效增加VR。因此,张力性容量的变化可以直接影响VR和心输出量(CO)。临床上,可以将张力性容量和非张力性容量用于以下几方面:指导容量复苏;指导血管活性药物的使用。在临床上应用张力性容量进行血流动力学评估时需要参考其他变量进行综合判断。
Intravascular volume is divided into two parts, one part of the non-tonic capacity, but also the stress reserve capacity; the other part is the tension capacity, which is the material basis for the generation of venous return (VR) dynamic pressure. Tension capacity and non-tension capacity under certain conditions can be converted to each other. Tensile capacity can not currently be measured by any monitoring device. Tension capacity can be indirectly measured by measuring the mean systolic filling pressure (Pmsf). According to VR = (Pmsf-Pra) / venous vascular resistance formula, increase Pmsf can effectively increase the VR. Therefore, changes in tonic capacity can directly affect VR and cardiac output (CO). Clinically, tonic and non-tonic capacity can be used in the following areas: guiding capacity recovery; and directing the use of vasoactive drugs. In the clinical application of tonic capacity for hemodynamic assessment need to refer to other variables to make a comprehensive judgment.