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什么是直肠内套叠
直肠内套叠(intrarectal invaginate)是指在排便过程中近侧直肠全层或单纯黏膜层折入远侧肠腔或肛管内不超过外缘者。又称直肠内脱垂、隐性直肠脱垂或不有效性直肠脱垂等本病是出口性梗阻性便秘的常见类型之一多发生在直肠远端,部分患者可累及直肠中段(图1)。由于直肠指检乙状结肠镜检查及钡剂灌肠时套叠多已复位,故临床诊断困难,只有通过排便动态造影才能明确本病诊断。
直肠内套叠的症状表现
在各类型的出口处梗阻型便秘患者中,男性以直肠内套叠发病较多。
其症状为直肠排空困难、排便不净及肛门阻塞感,用力越大阻塞感越重。患者将手指或栓剂插入肛门帮助粪便排出,插入肛门的手指或栓剂将下垂的直肠黏膜推回复位,解除了梗阻的原因。
部分患者排便时有下腹部或骶部疼痛,偶有血便或黏液便,伴有精神症状,多为忧郁或焦虑。
直肠内套叠确诊方法
患者主诉直肠内有阻塞感、排便不全、便次多,每次粪量少时应考虑患本病的可能,诊断上可进行下列检查:
①直肠指检可发现直肠下端黏膜松弛或肠腔内黏膜堆积。
②乙状结肠镜检查虽不能发现内套叠,因插入肠镜时已将套叠复位,但在内套叠处常可见溃疡、糜烂、黏膜红斑或水肿,常易误诊为直肠炎症性疾病。
③排便动态造影是有价值的检查方法,可明确本病诊断。典型的表现是直肠侧位片可见黏膜脱垂呈漏斗状影像,部分患者有骶骨直肠分离现象。有人认为,直肠内套叠与会阴下降综合征的症状及临床表现类似。会阴下降时,由于排便时过度摒气,可致直肠前壁黏膜脱垂,因此可能两者是一种疾病,仅在不同发展阶段有不同表现。
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