目的　通过X线腹部平片对肠道气体进行定量测试 ,分析肠道气体容量与肠易激综合征(IBS)的关系。方法　 4 8例根据罗马Ⅱ标准诊断的IBS病人和 2 5例正常对照的X线腹部平片经数字化转换后输入电脑 ,肠道气体量在电脑显示为象素值 ,经体格标准化后 ,以气体容量积分 (GVS)表达。以对照GVS的 x± 2s为正常值 ,分析GVS与IBS型别的关系。结果　正常对照GVS为 0 .0 5 5±0 .0 12 ,离散系数为 2 1.8% ;便秘型IBS均值 (0 .0 76± 0 .0 2 7,t =3.5 99,P <0 .0 1)与正常人比较显著增高 ,4 4 .4 %的个体GVS大于正常值 ,余在正常范围 ;腹泻型IBS均值 (0 .0 4 8± 0 .0 32 ,t =1.4 76 ,P >0 .0 5 )与正常人比较差异无显著性 ,但离散系数高达 6 6 .7% ,4 2 .9%的病人GVS降低 ,14 .3%增高。结论　IBS病人肠道气体容量存在明显改变 ,并与型别有关 ;便秘型以增多为主 ,腹泻型以减少为主。 Objective To quantitatively test intestinal gas by X-ray abdomen plain film to analyze the relationship between intestinal gas volume and irritable bowel syndrome (IBS). Methods 48 cases of IBS patients diagnosed according to the Rome II standard and 25 normal controls were transplanted into the computer and the amount of intestinal gas was displayed on the computer as pixel values. Volume integral (GVS) expression. To control the GVS x ± 2s as a normal value, analysis of GVS and IBS type relationship. Results The normal control GVS was 0. 05 ± 0. 0 12, the discrete coefficient was 2 1.8%. The average IBS of constipation was (0.76 ± 0.27, t = 3.599, P <0.01 ) Was significantly higher than that in normal subjects, while in 44.4% of individuals, the GVS was higher than the normal value and remained within the normal range. The average IBS of diarrhea type was (0.408 ± 0.302, t = 1.476, P> 0). There was no significant difference compared with normal subjects, but the discrete coefficient was as high as 66.7%. In 42.9% of patients, GVS was decreased and 14.3% was increased. Conclusions There is a significant change in the intestinal gas volume in patients with IBS, which is related to the type of constipation. The constipation type mainly increases and the diarrhea type decreases mainly.