title: Use of perchlorate to block gastric uptake of free 99Tcm in the investigation of gastrointestinal bleeding.
abstract: The use of perchlorate to block gastric uptake of free 99Tcm-pertechnetate after in vivo labelling of red cells was investigated. In 19 out of 20 cases there was no evidence that previous administration of perchlorate adversely affected red cell labelling using commercial stannous agents. Adequate scintigraphic images of the vascular system could be obtained for up to 24 h after the cells were labelled. The technique was found to be of value in the investigation of sites of gastrointestinal bleeding.
mesh_terms: D003106:Colon / Q000000981:diagnostic imaging; D003108:Colonic Diseases / Q000000981:diagnostic imaging; D004912:Erythrocytes; D004932:Esophageal and Gastric Varices / Q000000981:diagnostic imaging; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D010472:Perchlorates; D011877:Radionuclide Imaging; D017670:Sodium Compounds; D013670:Sodium Pertechnetate Tc 99m; D013270:Stomach / Q000000981:diagnostic imaging
chemical_list: D010472:Perchlorates; D017670:Sodium Compounds; C031068:sodium perchlorate; D013670:Sodium Pertechnetate Tc 99m