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Related Experiment Videos

[MR aortofemorography versus DSA: prospective evaluation].

A Nchimi1, D Brisbois, E Donkers

  • 1Service d'lmagerie Médicale, Les Cliniques Saint-Joseph, Liège, Belgique.

JBR-BTR : Organe De La Societe Royale Belge De Radiologie (SRBR) = Orgaan Van De Koninklijke Belgische Vereniging Voor Radiologie (KBVR)
|December 6, 2002
PubMed
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Magnetic Resonance Angiography (MRA) of lower limbs is a valuable tool for evaluating peripheral arterial obstructive disease, particularly for stenosis above the knees. This technique demonstrates high accuracy and can reduce the need for Digital Subtraction Angiography (DSA).

Area of Science:

  • Vascular Imaging
  • Radiology
  • Medical Diagnostics

Background:

  • Peripheral arterial obstructive disease (PAOD) significantly impacts patient mobility and quality of life.
  • Accurate pre-therapeutic assessment of lower limb arterial stenosis is crucial for effective treatment planning.
  • Digital Subtraction Angiography (DSA) has been the gold standard but is invasive.

Purpose of the Study:

  • To evaluate the diagnostic performance of 3-D gadolinium-enhanced MRA with a moving bed.
  • To determine if MRA can obviate the need for pre-therapeutic DSA in patients with lower limb ischemia.
  • To compare MRA findings with DSA in assessing stenosis severity.

Main Methods:

  • Prospective comparison of MRA with DSA in 49 patients with lower limb ischemia (Grades I-IV).

Related Experiment Videos

  • Three-step 3-D gadolinium-enhanced aortofemorography with a moving bed was utilized for MRA.
  • Statistical analysis included Cohen's kappa for interobserver variability and comparison, alongside sensitivity, specificity, and predictive values for >80% stenosis.

    • Main Results:

    • MRA demonstrated an overall accuracy of 92% in evaluating lower limb arterial disease.
    • High agreement between MRA and DSA was observed (kappa=0.87), with excellent agreement above the knees (kappa=0.95).
    • For stenosis >80% above the knees, MRA showed 98% sensitivity and 98% specificity; below the knees, 87% sensitivity and 91% specificity.

    Conclusions:

    • MRA is a highly accurate and valuable technique for evaluating peripheral arterial obstructive disease.
    • MRA is particularly effective for assessing stenosis located above the knee.
    • The findings suggest MRA can serve as a reliable alternative, potentially reducing the need for invasive DSA.