严重感染患者血清白蛋白动力学研究

目的了解感染状态下血清白蛋白的分解和分布动力学的变化,以进一步明确感染患者低白蛋白血症的发生机制。方法对照组10例,全部为男性健康志愿者;感染组10例,均为严重感染患者,APACHEⅡ评分8～22(平均13)。采用氯胺T法,用125I 标记人体白蛋白。所有受试者一次性从上臂静脉注射20μCi的125I白蛋白,分别在第0、1、2、4、8、12、24h,第2、3、4、5、6、7、9、11、13、15、18、22、25天抽血,测定γ射线量(dpm),拟合浓度时间曲线,计算标记白蛋白的半衰期(t1/2),分布容积(Vd),中央池向周边池的转运速率(K12)。结果感染组的125I标记白蛋白t1/2(d)明显短于对照组(8.2±1.4vs.12.5±1.7,P<0.01);感染组标记白蛋白从中央池向周边池的转运速率(K12)显著高于对照组[(4.4±1.9)×10-2/hvs.(2.4±0.6)×10-2/h,P<0.05];两组分布容积(Vd)则没有显著的差异(P>0.05)。结论在感染条件下,血清白蛋白从血管内到血管外的分布速率明显增加,白蛋白的分解速率也显著增加。

Kinetics of serum albumin in patients with severe sepsis

Objective Albumin is well known to decrease in response to sepsis, However, the.degradation and distribution in patients with severe sepsis to explore the mechanism of hypoalbuminemia in sepsis. Methods 10 volunteers and 10 patients with severe sepsis. 125I labeled albumin was administered intravenously to 10 healthy volunteers and 10 patients with severe sepsis. Each subject had frequent blood samples taken at 0,1,2,4,8,12,24 hours and on day 2, 3, 4, 5, 6, 7, 9, 11, 13, 15, 18, 22, 25 to measure 125I concentration and draw the curve of concentration over time. Plasma was regarded as the central pool and body fluid as side pool, The curve of albumin concentration vs time was expected to follow two compartment model. Results Radioactivity of blood samples was counted and the results were graphically expressed. The half-life time(t1/2), apparent volume of distribution(Vd) and transportation rate(K12) of albumin from the central pool to the side pool were calculated. The half-life time in sepsis was obviously shorter than that in control group (8.2 1.4 vs 12.5 1.7days, P<0.001). The transportation rate in sepsis group was quicklier than that in control group [(4.4±1.9)× 10-2/h vs (2.4±0.6)×10-2/h, P<0.005]. There was no significant difference in apparent volume of distribution between two groups. Conclusions In patients with severe sepsis, the distribution rate of albumin from plasma to body fluid was obviously elevated and the decomposition rate of albumin was markedly increased.