title: Implications of negative technetium 99m-labeled red blood cell scintigraphy in patients presenting with lower gastrointestinal bleeding.
abstract: BACKGROUND
  Lower gastrointestinal (GI) bleeding frequently recurs after negative technetium 99m-labeled red blood cell (RBC) scintigraphy.
  
  
  METHODS
  Between July 1, 1999 and July 31, 2005, 84 negative (99m)Tc-labeled RBC scintigrams were obtained for acute lower GI bleeding. Medical records were abstracted for age, gender, prior history of lower GI hemorrhage, length of hospitalization, initial hematocrit (Hct) and Hct nadir, transfusion requirements, cause of bleeding, use of anticoagulants and/or antiplatelet medications, and rebleeding episodes.
  
  
  RESULTS
  The overall rate of rebleeding was 27% (n = 23). There were no significant associations between any of the patient variables investigated and rebleeding.
  
  
  CONCLUSIONS
  Despite negative (99m)Tc-labeled RBC scintigraphy, more than 25% of patients experience recurrent lower GI bleeding. Patient age, bleeding source, use of anticoagulant/antiplatelet medications, length of stay, admission Hct, Hct nadir, transfusion requirements, and gender are not predictive of the patients who will rebleed.
authors.affiliation: Department of Colon and Rectal Surgery, The Ochsner Clinic Foundation, 1514 Jefferson Hwy., New Orleans, LA 70121, USA.
authors.forename: Kerry L
authors.initials: KL
authors.lastname: Hammond
authors.forename: David E
authors.initials: DE
authors.lastname: Beck
authors.forename: Terrel C
authors.initials: TC
authors.lastname: Hicks
authors.forename: Alan E
authors.initials: AE
authors.lastname: Timmcke
authors.forename: Charles W
authors.initials: CW
authors.lastname: Whitlow
authors.forename: David A
authors.initials: DA
authors.lastname: Margolin
mesh_terms: D000368:Aged; D004912:Erythrocytes / Q000000981:diagnostic imaging*; D005260:Female; D005500:Follow-Up Studies; D006471:Gastrointestinal Hemorrhage / Q000000981:diagnostic imaging* / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D008145:Louisiana / Q000453:epidemiology; D008297:Male; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D012008:Recurrence; D012189:Retrospective Studies; D012307:Risk Factors; D013667:Technetium
chemical_list: D019275:Radiopharmaceuticals; D013667:Technetium