豚鼠胆囊胆固醇结石形成过程中小肠动力的变化

目的 观察豚鼠胆囊胆固醇结石形成过程中小肠动力的变化,探讨其在胆囊结石形成中的作用.方法 将40只豚鼠随机分为实验组与对照组,每组20只,实验组给予致石饲料(胆固醇含量2％),对照组给予正常颗粒饲料,8周造模结束后,利用多通道生理记录仪分别记录实验组与对照组豚鼠离体小肠肌条慢波和张力变化,分析其与胆囊胆固醇结石形成的关系,组间比较采用t检验.结果 豚鼠小肠离体肌条慢波频率实验组为5.70±1.05次／min,对照组为17.45±1.50次／min,振幅实验组为0.23±0.31 mv,对照组为0.78 ±0.17 my,实验组数据较对照组明显降低,P值分别为:4.56×10-25,4.00×10-13,均＜0.05；组间比较t值分别为:-27.083,-13.236；豚鼠小肠离体肌条肌肉收缩频率实验组为5.94±1.25次／min,对照组为15.85±1.76次/min,张力效应值实验组为0.78±0.02g,对照组为1.20±0.11g,实验组数据较对照组明显降低,P值分别为2.41×10-20,1.55×10-13,均＜0.05；组间比较t值分别为:- 19.448,- 17.307.结论 致石组豚鼠小肠动力较对照组明显下降,提示小肠动力异常可能在胆囊胆固醇结石形成过程中发挥作用.

Enteric motility alterations in experimental gallbladder cholesterol stones formation in guinea pigs

Objective To study the changes in small intestinal motility during the process of gallbladder cholesterol stone formation.Methods Forty guinea pigs were divided into two groups of 20 each,the experiment group fed on high cholesterol diet ( cholesterol 2％ ),while the control group on normal diet.Animals were sacrificed at 8 weeks.Slow wave and tension of the isolated small intestinal muscle specimen were measured using a multi-channel physiological recorder,and its relation to gallstone formation was assessed.Results Compared with the control group,the frequency and amplitude of the slow wave significantly reduced in the experimental group (5.70 ± 1.05/min vs.17.45 ± 1.50/min and 0.23 ± 0.31 my vs.0.78 ±0.17 mv respectively,P ＜0.05).The t-value between the two groups were -27.083 and - 13.236 respectively; Frequency of contraction and muscle tension also reduced significantly (5.94 ± 1.25/min vs.15.85 ± 1.76/min and 0.78 ±0.002 g vs.1.20 ±0.11 g respectively,P ＜0.05).Thet-value between the two groups were - 19.448 and - 17.307 respectively.Conclusions Reduced small intestinal motility is present in guinea pigs fed on a lithogenous diet,and may have a role in the pathogenesis of cholesterol gallstone formation.