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小兒便秘的原因 導致小兒便秘的常見原因(2)

出處：媽媽育兒網(wǎng)日期：2010-10-15 13:24:47編輯：admin

3.拖延大便時間。

一些人把大便當作無關緊要，可早可遲的事，忽視定時排便的習慣；或因工作過忙、情緒緊張、旅行生活等，拖延了大便時間，使已到了直腸的糞便返回到結腸；或因患有肛裂和痔瘡等肛門疾病、恐懼疼痛、害怕出血、不敢大便而拖長大便間隔時間。這都可能使直腸壁上的神經(jīng)細胞對糞便進入直腸后產(chǎn)生的壓力感受反應變遲鈍，使糞便在直腸內停留時間延長而不引起排便感覺，形成習慣性便秘。

4.水份損失過多。

大量出汗、嘔吐、腹瀉、失血及發(fā)熱等均可使水份損失，代償性引起糞便干結。

繼發(fā)性因素

1.器質性受阻。

腸管內發(fā)生狹窄或腸管外受到壓迫時，如腸管良性和惡性腫瘤、慢性炎癥所引起的腸腔狹窄變小、巨結腸癥引起的直腸痙攣狹窄、手術后并發(fā)的腸粘連、部分性腸梗阻等，或腹腔內巨大腫瘤，如卵巢囊腫、子宮肌瘤，以及妊娠、腹水壓迫大腸等，可控糞便通過受到障礙，在腸管內停留時間過長，形成便秘。近年來通過排便造影、肛腸測壓、結腸傳輸時間測定、盆底肌電圖等技術檢查手段，發(fā)現(xiàn)了新的便秘類型，稱出口處梗阻型便秘(或盆底肌功能不良)。特點是排便時盆底出口處出現(xiàn)梗阻因素，其中有些可經(jīng)外科手術消除或緩解。

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