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消化道出血为内外科常见急症之一,约占急诊入院病人的80％。尽管大多效患者可以得到正确诊断和及时治疗,但仍有5～20％的病例难以确定诊断,特别是下消化道出血,关键难题是出血点的定位诊断。放射性核素闪烁照相技术近年已应用于消化道出血的定位诊断,并在临床实践中取得良好的效果。消化道出血定位诊断的方法有多种,包括钡剂检查、内窥镜、选择性动脉造影及外科开腹探查等。但这些方法都有缺点,缺乏足够的敏感性和特异性,给诊断和治疗带来极大的困难,在需要外科治疗的病例尤为明显。有报道指出常规钡剂检查在下消化道出血的诊断中失败率达20～30％。内窥镜检查对结肠病变引起的出血较敏感,但在急性大出血时难以进行且对小肠病变无效。选择性血管造影是较敏感的诊
Gastrointestinal bleeding is one of the common emergency surgery, accounting for about 80% of emergency patients admitted. Although the majority of effective patients can get the correct diagnosis and prompt treatment, but there are still 5 to 20% of cases difficult to confirm the diagnosis, especially the lower gastrointestinal bleeding, the key problem is the diagnosis of bleeding localization. Radionuclide scintigraphy in recent years has been applied to the diagnosis of gastrointestinal bleeding, and achieved good results in clinical practice. Gastrointestinal bleeding localization diagnosis of a variety of ways, including barium examination, endoscopy, selective arteriography and surgical laparotomy and so on. However, these methods have disadvantages, lack of sufficient sensitivity and specificity, which bring great difficulties in diagnosis and treatment, especially in the cases requiring surgical treatment. It has been reported that the conventional barium test in the diagnosis of lower gastrointestinal bleeding failure rate of 20 to 30%. Endoscopy is more sensitive to bleeding caused by colonic lesions, but difficult to perform in acute massive hemorrhage and ineffective in small intestine lesions. Selective angiography is a more sensitive clinic