title: Value of technetium-99m HMPAO-labelled leucocyte scintigraphy as an initial screening test in patients suspected of having inflammatory bowel disease.
abstract: OBJECTIVE
  This study was designed to evaluate the role of technetium-99m (99mTc) hexamethyl propylene amine oxime (HMPAO)-labelled leucocyte imaging as an initial screening test in patients suspected of having inflammatory bowel disease (IBD).
  
  
  METHODS
  Thirty-one patients in whom a final diagnosis of irritable bowel syndrome (IBS) was made (group 1) and another 33 patients with established Crohn's disease (group 2) were studied. All patients had 99mTc HMPAO-labelled leucocyte scan with imaging at 40 and 120 min. Scans with abnormal bowel uptake were considered positive and this uptake was quantified by visual grading and computer-based methods (scan score). Group 1 patients with positive 99mTc HMPAO scan underwent an indium-111 (111In)-labelled leucocyte scan (imaging at 180 min) followed by endoscopy and barium radiology as deemed necessary in order to verify the 99m Tc HMPAO result.
  
  
  RESULTS
  Three scan patterns were seen: well localized and unequivocally positive scans at both 40 min and 2 h were obtained from 28 patients. All but one had established Crohn's disease. Diffuse bowel uptake was seen in 14 scans. Ten of these (false positive) were obtained from symptomatic patients with IBS and four (false negative) from patients with asymptomatic Crohn's disease. No bowel uptake at 40 min and 2 h was seen in 22 scans. All but two of these (who had quiescent Crohn's disease) were obtained from patients with IBS. Active Crohn's disease is associated with significantly higher scan score (mean +/- SEM, 82.1 +/- 13.6) than the false positive scans (12.5 +/- 3.1, P > or = 0.001). Patients with false positive 99mTc HMPAO scans had negative 111In scans, endoscopy and barium radiology.
  
  
  CONCLUSIONS
  Bowel scanning using either 111In or 99mTc HMPAO is useful in excluding active IBD. Because of radiation dose, image quality and availability 99mTc may be preferred to 111In.
authors.affiliation: Department of Gastroenterology, Royal Hallamshire Hospital, Sheffield, UK.
authors.forename: M H
authors.initials: MH
authors.lastname: Giaffer
authors.forename: W B
authors.initials: WB
authors.lastname: Tindale
authors.forename: D
authors.initials: D
authors.lastname: Holdsworth
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D003109:Colonic Diseases, Functional / Q000000981:diagnostic imaging*; D003424:Crohn Disease / Q000000981:diagnostic imaging; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007205:Indium Radioisotopes; D015212:Inflammatory Bowel Diseases / Q000000981:diagnostic imaging*; D007422:Intestines / Q000000981:diagnostic imaging*; D007962:Leukocytes; D008297:Male; D015609:Organotechnetium Compounds; D010091:Oximes; D011877:Radionuclide Imaging; D019690:Technetium Tc 99m Exametazime; D013997:Time Factors
chemical_list: D007205:Indium Radioisotopes; D015609:Organotechnetium Compounds; D010091:Oximes; D019690:Technetium Tc 99m Exametazime