Effect of Shenfu injection on microcirculation effect index in early-and middle-stage of cardiogenic shock rats

OBJECTIVE Shenfu injection(SFI)is an effective treatment of cardiogenic shock,the pathology of the central link was microcirculation disturbance.However,whether the microcirculation status of the early-and mid-stage of cardiogenic shock has any difference is unclear.This study aimed to observe the effect of SFI on the microcirculatory disturbance in mesentery for early-and mid-stage of cardiogenic shock rat.METHODS The early-and mid-stage model of cardiogenic shock was established by ligating the ending or root of left anterior descending coronary arteries(LADCA).The rats were randomly divided into 9 groups,ie control group,early-stage model group,mid-stage model group,3 early medicated groups and 3 mid medicated groups(the dosage was 1,3.33,10 mL·kg~(-1) SFI for cardiogenic shock rats of early-and mid-stage,respectively).Parameters in mesenteric microcirculation,such as velocity of RBCs in venules,diameters of venules,the count of leukocyte adhesion and vascular permeability which calculated by FITC-dextran leakage were observed through an GeneandiM2 inverted intravital microscope and high-speed video camera system.RESULTS The cardiogenic shock induced by ligating the LADCA resulted in a number of responses in microcirculation,including a significant increase in the counts of adhesive leukocytes,narrowing of the vascular diameter,decrease in the velocity of RBCs and dextran efflux.All of the above parameters for early-stage cardiogenic shock rats were attenuated by the treatment with SFI,especially the dosage of 10 mL·kg~(-1).While SFI had no apparent time-effect on the vascular diameter and vascular permeability in mesentery for mid-stage cardiogenic shock rats.CONCLUSION The microcirculation status of the early-and mid-stage of cardiogenic shock rats were quite different.The efficacy of early treatment with SFI was more obvious than the mid administration,which could provide experimental and theoretical basis for the patients with cardiogenic shock in an earlier time.