Estudio de concordancia diagnóstica entre la angiorresonancia magnética y la arteriografía en la isquemia crítica de miembros inferiores

Abstract

ObjectivesTo evaluate the validity of 3-D magnetic resonance angiography (MRA) with gadolinium and compare the diagnostic results with digital subtraction angiography (DEA) in patients with critical limb ischemia. MaterialThe study consisted of 40 patients diagnosed with lower limb critical ischemia treated using an endovascular technique in our unit between September 2012 and September 2014. There were 28 males. The mean age was 69 years, and 24 of them had more than 3 vascular risk factors. They had Rutherford scores of 4 (n=19, 5 (n=16), and 6 (n=5). MethodsA retrospective evaluation was performed on the intra-operative angiography images, comparing them with the MRA images obtained before the intervention (no more than 3 months between them). The arterial tree was divided into 9 segments, grouped in the iliac, femoropopliteal and distal sectors. The sensitivity (S), specificity (Sp), positive and negative predictive values, and kappa coefficient (K) for each segment, as well as overall. ResultsThe overall S and Sp was 88.3 and 89%, respectively. In the iliac sector, it was 93 and100%, in the femoropopliteal, 93 and 92%, and in the distal 84 and 65%, respectively. The overall kappa index was 0.76, with 0.94 in the iliac sector 0.88 in the femoropopliteal, and 0.47 in the distal. The analysis of 10% of the distal sectors was impossible, due to venous contamination in the MRA. ConclusionsMRA may be considered as a valid alternative to DSA in the iliac-femoropopliteal sector. At distal level, the MRA results should be interpreted with caution due to the decrease in the concordance index with the gold standard.