羟乙基淀粉130/0.4急性高容量血液稀释对脓毒症兔肠粘膜屏障的影响

目的 探讨羟乙基淀粉130/0.4(HES 130/0.4)急性高容量血液稀释(AHH)对脓毒症兔肠粘膜屏障的影响.方法 健康新西兰兔30只,体重2.0～3.0 kg,雌雄不拘,随机分为假手术组(S组)、脓毒症组(SEP组)和AHH组,每组10只.采用改良升结肠持续引流致腹膜炎(CASP)的方法制备兔脓毒症模型,AHH组于CASP后4 h静脉输注HES 130/0.4 20 ml/kg,速率为20 ml/min.于CASP后4 h(AHH前)、5、6、7、8 h时记录平均动脉压(MAP)、心率(HR);于CASP后4 h和8 h时开腹观察腹腔情况,取颈动脉血及肠系膜上静脉血各1 ml用于血气分析、计算肠氧摄取率和测定血浆D-乳酸浓度.于CASP后8 h时取小肠组织,计算肠组织湿/干重比(W/D),光镜下观察肠粘膜病理学结果,采用Chiu评分评价肠粘膜损伤情况.结果 与S组比较,SEP组CASP后MAP降低、HR升高、肠系膜上静脉血乳酸浓度升高、BE和pH值降低、肠氧摄取率降低、血浆D-乳酸浓度和Chiu评分升高(P＜0.05),肠粘膜损伤严重;与SEP组比较,AHH组CASP后MAP升高、HR降低,CASP后8 h时肠系膜上静脉血乳酸浓度降低、BE和pH值升高、肠氧摄取率增高、血浆D-乳酸浓度和Chin评分降低(P＜0.05),肠粘膜损伤减轻.结论 HES 130/0.4 AHH可减轻脓毒症兔肠粘膜屏障损伤.

Effects of acute hypervolemic hemodilution with hydroxyethyl starch 13010.4 on intestinal mucosal barrier in a rabbit model of sepsis

Objective To investigate the effects of acute hypervolemic hemodilution (AHH) with hydroxyethyl starch (HES) 130/0.4 on intestinal mucosal barrier in a rat model of sepsis.Methods Thirty healthy New Zealand rabbits of both sexes weighing 2.0-3.0 kg were randomly divided into 3 groups (n=10 each):group I sham operation; group II sepsis and group III AHH+sepsis.Sepsis was produced by modified colon ascendens stent peritonitis(CASP).At 4 h after CASP group III meceived HES 130/0.4 20 ml/kg iv at a rate of 20 ml/min.The MAP and HR were monitored and recorded at 4 h (before AHH) and 5,6,7,8 h after CASP.Blood samples were taken from carotid artery and superior mesenterie vein (SMV) at 4 h and 8 h after CASP for blood gas analysis and determination of plasma D-lactate concentration and intestinal oxygen extraction ratio.The rabbits were sacrificed at 8 h after CASP and a segment of ileum of 3 cm in length,5 cm from ileocecal valve,was removed for determination of wet/dry ileum weight ratio and microscopic examination.The degree of damage to intestinal mucous membrane was scored according to Chiu score (0=normal,5=severe damage).Results Sepsis-induced hypotension and metabolic acidosis,increased plasma D-lactate concentration,decreased intestinal oxygen extraction ratio,increased wet/dry ileum weight ratio and Chiu score in group II as compared with group I.AHH with HES 130/0.4 20 ml/kg significantly attenuated the scpsis-induced changes in group III.Conclusion AHH with HES 130/0.4 can attenuate damage to intestinal mucosal barrier produced by sepsis.