慢性溃疡性结肠炎、慢性痢疾等肠道疾病的患者常需用药物作保留灌肠，使药液直接接触病变部位而达到治疗的目的，药液在胸腔内保留时间的长短与疗效有直接关系，总结如下。药液不能保留的原因；①药液的刺激性大；②药液的温度不当；③灌入的速度过快；④肛管太粗；⑤有咳嗽等 Chronic ulcerative colitis, chronic dysentery and other intestinal diseases often require drugs for retention enema, so that direct contact with the medical solution to the lesion site to achieve the purpose of treatment, liquid retention time in the chest cavity has a direct relationship with the efficacy, Summarized as follows. The reason why the liquid can not be preserved; ① The irritation of the liquid is large; ② The temperature of the liquid is improper; ③ The pouring speed is too fast; ④ The anal canal is too thick;