(1)腹痛:一般为阵发性剧烈绞痛。开始疼痛较轻,随后病情加重,绞痛达到高峰后,疼痛又逐渐减轻,直至消失。过片刻后上述症候又再次发作。绞窄性肠梗阻,腹痛往往为持续性疼痛伴阵发性加剧。
(2)呕吐:梗阻早期为反射性呕吐,呕吐物为食物或胃液。高位小肠梗阻,呕吐较频繁,呕吐大量胃液、十二指肠液和胆汁。低位小肠梗阻,可出现1-2天呕吐静止期,之后再发呕吐,呕吐物为带粪臭的粪样物。如为绞窄性梗阻,呕吐物可呈血性或咖啡色。
(3)腹胀:一般在肠梗阻发生后的一段时间出现。腹胀程度与梗阻部位有关。高位肠梗阻时腹胀较轻,但有时可见胃型。低位梗阻则表现为全腹膨胀,常伴有肠型。
(4)肛门停止排气排便:发生急性完全性肠梗阻,肛门则无排便排气。在早期由于肠蠕动增加,梗阻以下部位残留的气体和粪便仍可排出。所以早期少量的排气排便不能排除肠梗阻的诊断。绞窄性肠梗阻则可能排出血性液体或果酱样便。
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