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粪石性肠梗阻

时间:2022-05-12 理论教育 版权反馈
【摘要】:粪石是由进入体内异物在胃或小肠内凝结而成。粪石肠梗阻的易感因素包括不充分咀嚼、高纤维饮食和胃切除史。粪石性肠梗阻的发病具有季节性,多在柿子、山楂、黑枣收获的季节。诊断主要依靠询问病史,即发病前有否一次性进食过多柿子、山楂、黑枣等含有鞣酸食物史,以及有无腹胀、腹痛、呕吐、肛门停止排气及排便等肠梗阻症状。X线透视检查早期多无典型肠梗阻征象,部分表现为肠胀气及多个小液平。

第十节 粪石性肠梗阻

一、成因

粪石是由进入体内异物在胃或小肠内凝结而成。绝大部分粪石可分为两类:植物粪石和毛粪石,小肠粪石以植物粪石为主。植物粪石最常见在胃中形成,接着全部或部分进入小肠而产生症状;植物粪石由难以消化的纤维、果核,以及某些水果如橙、柿子、山楂及枣等组成。粪石肠梗阻的易感因素包括不充分咀嚼、高纤维饮食和胃切除史。

粪石性肠梗阻(stercoral obstruction)是指各种植物的果核、果皮或纤维素等形成的植物性粪石,嵌顿于肠腔而引起机械性肠梗阻。

多数由胃石迁移至肠管后发生,少数在肠憩室内或狭窄肠管近端发生。通常是在一次性进食过多柿子、山楂、黑枣等含有鞣酸食物后,鞣酸及胃酸可与蛋白质结合为不溶于水的鞣酸蛋白而沉淀于胃肠内。另外,柿子内尚含有的树胶和果胶遇到鞣酸凝集,可沉淀合成块,更可与食物残渣聚积成巨大团块。

二、临床特点

粪石性肠梗阻的发病具有季节性,多在柿子、山楂、黑枣收获的季节(9~12月)。诊断主要依靠询问病史,即发病前有否一次性进食过多柿子、山楂、黑枣等含有鞣酸食物史,以及有无腹胀、腹痛、呕吐、肛门停止排气及排便等肠梗阻症状。B超检查无明显特异性表现,少数可显示肠腔内占位性病变。X线透视检查早期多无典型肠梗阻征象,部分表现为肠胀气及多个小液平。

临床诊断主要根据病史。粪石性肠梗阻一般具有如下特点:①空腹大量进食生柿子可在胃内形成柿石,胃内柿石进入肠管可造成肠梗阻;②如果没有考虑到柿石性肠梗阻易误诊为其他疾病,导致长时间治疗效果不佳;③柿石性肠梗阻保守治疗有可能成功,因而避免手术创伤;④柿石通过回盲瓣时可以出现腹痛加剧;⑤保守治疗时强调中西医结合。

三、治疗

本病保守治疗效果较差,一旦确诊后应及早手术治疗。一般根据粪石硬度、肠管有否坏死及穿孔、有无并存胃石、肠憩室、肠管狭窄、肠套叠等情况选择手术方式。

1.肠粪石手法挤碎、肠减压取石术 适应于无肠管坏死、肠憩室及狭窄病例,但动作要轻柔,且不要在嵌顿处进行,因该处肠壁血运较差,易穿孔,故应远侧肠管推移后进行。

2.肠切开取石术 适应于手法碎石失败的病例。

3.肠部分切除、肠吻合术 对并发肠坏死、肠憩室、肠管狭窄及肠套叠等病例,切除病变组织取石,同时行肠减压。

4.暂时性肠造口、二期闭合术 适应于有肠坏死而病情危重不能耐受肠切除手术病例。

5.胃切开取石术 适应于胃石症。

四、预防

在柿子、山楂、黑枣产区应加强卫生宣传工作。柿子、山楂、黑枣等含有鞣酸的食物不能进食过多,尤其是未成熟果品更不能多食用,且不要空腹食用。

(韩少良)

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