Jacobson A F
Nuclear Medicine Service, Department of Veterans Affairs Medical Center, Seattle, WA 98006.
J Nucl Med. 1991 Feb;32(2):330-2.
Two patients studied with technetium-99m-labeled red blood cells (RBCs) for gastrointestinal bleeding had positive findings only on 24-hr delayed images, at which time the site of bleeding could not be ascertained. In each instance, when additional delayed images suggested that active bleeding was occurring, a second aliquot of RBCs was labeled and injected. Sites of active hemorrhage were identified following further imaging in both patients. When delayed GI bleeding images are positive, further views should be obtained to ascertain if the pattern of intraluminal activity changes. If renewed active hemorrhage is suspected, reinjection with a second dose of labeled RBCs may identify the bleeding site.
两名使用锝-99m标记红细胞（RBC）进行胃肠道出血研究的患者仅在24小时延迟影像上有阳性发现，此时出血部位无法确定。在每个病例中，当额外的延迟影像提示有活动性出血时，另一批红细胞被标记并注射。两名患者在进一步成像后均确定了活动性出血部位。当胃肠道出血延迟影像呈阳性时，应获取更多影像以确定管腔内活性模式是否改变。如果怀疑再次出现活动性出血，再次注射第二剂标记红细胞可能会确定出血部位。
