title: Angiography for acute lower gastrointestinal hemorrhage: efficacy of cut film compared with digital subtraction techniques.
abstract: OBJECTIVE
  To find out if digital subtraction angiography (DSA) has a different diagnostic power than conventional cut-film angiography in investigating acute lower gastrointestinal (GI) hemorrhage.
  
  
  METHODS
  Retrospective analysis of two cohorts of patients investigated by angiography for acute lower GI hemorrhage was performed. One group of patients treated at one center ("hospital H") underwent conventional angiography. The other patients, treated at another center ("hospital G"), were investigated exclusively by DSA. The groups were compared for demographic characteristics, etiology, and bleeding parameters. The diagnostic power of both angiographic modalities was compared and statistically analyzed.
  
  
  RESULTS
  Fifty-five lower GI hemorrhages investigated by conventional cut-film angiography and 53 cases studied by DSA were included. Both study groups had statistically similar demographic and bleeding characteristics. Overall sensitivity, specificity, and positive and negative predictive values of cut-film angiography for localizing the lower GI bleeding were 62%, 73%, 86%, and 42%, whereas, for DSA, the respective values were 60%, 100%, 100%, and 24% (Z-test P values were.78,.02,.03, and.16).
  
  
  CONCLUSIONS
  DSA is as sensitive as conventional cut-film angiography for localizing acute lower GI bleeding. If a lesion is found, the chance that it will be the bleeding source is higher with DSA than with conventional angiography.
authors.affiliation: Department of Vascular and Interventional Radiology, Ghent University Hospital, De Pintelaan 185, B-9000 Gent, Belgium. luc.defreyne@rug.ac.be
authors.forename: Luc
authors.initials: L
authors.lastname: Defreyne
authors.forename: Michael
authors.initials: M
authors.lastname: Uder
authors.forename: Peter
authors.initials: P
authors.lastname: Vanlangenhove
authors.forename: Georges
authors.initials: G
authors.lastname: Van Maele
authors.forename: Marc
authors.initials: M
authors.lastname: Kunnen
authors.forename: Bernhard
authors.initials: B
authors.lastname: Kramann
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000792:Angiography; D015901:Angiography, Digital Subtraction; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012680:Sensitivity and Specificity