title: The run-off resistance (ROR) assessed on MR angiograms may serve as a valid scoring system in patients with symptomatic peripheral arterial disease (PAD) and correlates with the ankle-brachial pressure index (ABI).
abstract: OBJECTIVE
  To investigate the correlation between the hemodynamic parameter ankle-brachial pressure index (ABI) and the run-off resistance (ROR) assessed on MR angiograms (MRA) in patients with peripheral arterial disease (PAD) Fontaine Stage I and II and its potential as reliable reporting system in clinical routine.
  
  
  METHODS
  Contrast-enhanced MRA was performed in 321 PAD patients using a 1.5T MR scanner with moving bed technique. The ROR and resting ABI were determined in each patient's leg and correlation analysis was performed using the Pearson test.
  
  
  RESULTS
  A significant negative correlation (r = -.513; p<.001) between ROR (mean 11.03±5.42) and resting ABI (mean .81±.26) was identified. An even more pronounced correlation was found in patients younger than median age who had higher ABI values (r = -.608; p<.001).
  
  
  CONCLUSIONS
  The ROR scoring system evaluated in this series correlates better with the ABI than previously published scoring systems and could be suggested as reporting system for routine MRA evaluation.
authors.affiliation: Department of Vascular Surgery, Medical University Innsbruck, Anichstrasse 35, A-6020 Innsbruck, Austria. olaf.gorny@uki.at
authors.forename: O
authors.initials: O
authors.lastname: Gorny
authors.forename: W
authors.initials: W
authors.lastname: Santner
authors.forename: G
authors.initials: G
authors.lastname: Fraedrich
authors.forename: W
authors.initials: W
authors.lastname: Jaschke
authors.forename: A
authors.initials: A
authors.lastname: Greiner
authors.forename: M F
authors.initials: MF
authors.lastname: Schocke
mesh_terms: D000368:Aged; D055109:Ankle Brachial Index; D003287:Contrast Media; D005260:Female; D006439:Hemodynamics; D006801:Humans; D007866:Leg / Q000098:blood supply*; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D058729:Peripheral Arterial Disease / Q000503:physiopathology*; D012189:Retrospective Studies; D014655:Vascular Resistance / Q000502:physiology*
chemical_list: D003287:Contrast Media