益生菌对重型颅脑伤大鼠肠道菌群、消化酶及肠动力的影响

目的 探讨益生菌对重型颅脑伤大鼠肠道菌群、肠消化酶及小肠推进率的影响.方法 建立重型颅脑损伤大鼠模型.将SD大鼠随机分为A肠内营养组(三九全营素)、B益生菌组(三九全营素+益生菌)、C假手术组(正常饮食),于创伤后第3、7、14天留取肠黏膜、粪便标本,检测肠道消化酶、肠道菌群及小肠推进率的变化.结果 A组、B组同C组相比,乳杆菌、双歧杆菌的含量在创伤后2周内明显降低,而大肠杆菌数量则显著增加.A组同B组相比,双歧杆菌的数量在创伤后各时相点偏低,而大肠杆菌的水平则较高.A、B组的乳杆菌含量在创伤后7 d已无差异.2组致伤大鼠小肠二糖酶、Na+-K+-ATP酶的水平在创伤后2周内与假手术组相比显著降低,虽然B组的消化酶含量在各时相点均高于A组,但2组间无差异.同C组相比,A、B组的小肠推进率在颅脑损伤后2周内明显降低,但2组之间无差异.结论 益生菌可以改善重型颅脑伤后肠道的菌群紊乱,调节肠消化酶的活性,从而减轻小肠的吸收障碍.

Influence of probiotics on the gut microflora,digestive enzymes and intestinal motility in rats with severe head injury

Objective To study the influence of probiotics on the gut microflora,digestive enzymes and small intestinal propulsive rate of rats with severe head injury. Methods The rat model of severe head injury was prepared, SD rats were randomly divided into group A (enteml nutrition) , group B (enteral nutrition plus probiotics) , and group C (normal diet) . The intestine mucesa and faeces were collected on the third day,7th day and 14th day after head injury in order to detect gut microflora,digestive enzymes and small intestinal propulsive rate. Results Compared with group C, the number of Lactobacillus and Bacillus bifidus group in group A and group B declined in two weeks after trauma, however, the number of Escherichia coli increased significantly. Bacillus bifidus amounts of group A were significantly lower than that of group B at every time point, the diversity of Escherichia coli was opposite. No difference was seen in content of Lactobacillus 7 days after trauma in group A and B. The level of disaecharidases, Na+- K+- ATPase and small intestinal propulsive rate declined significantly at every time point, compared with group C.Though the contents of digestive enzymes was higher in group B than that of group A, and small intestinal propulsive rate was higher in group A and B than that in group C, but the two groups showed no difference. Conclusions Probiotics can alleviate the in-testine microflora disorder,modulate the activities of digestive enzymes, therefore lessen malabsorption of rats with severe head injury.