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Table 4 Renal duplex sonography

From: A randomized, multi-center, prospective study comparing best medical treatment versus best medical treatment plus renal artery stenting in patients with hemodynamically relevant atherosclerotic renal artery stenosis (RADAR) – one-year results of a pre-maturely terminated study

  Baseline 6 months 12 months
Stenta BMTa Stenta BMTa Stenta BMTa
Renal aortic ratio 4.6 ± 2.0 5.0 ± 2.3 1.7 ± 0.9 (< 0.001)b 4.5 ± 2.6 (0.462)b 1.5 ± 0.6 (< 0.001)b 3.0 ± 1.5 (0.004)b
P value 0.527 < 0.001 0.003
Maximal systolic flow, cm/s 317 ± 94 360 ± 102 147 ± 51 (< 0.001)b 355 ± 133 (0.178)b 138 ± 44 (< 0.001)b 301 ± 117 (0.125) b
P value 0.061 < 0.001 < 0.001
Renal resistive index 0.69 ± 0.09 0.65 ± 0.12 0.73 ± 0.10 (0.005)b 0.63 ± 0.12 (0.594)b 0.73 ± 0.08 (< 0.001)b 0.63 ± 0.13 (0.438)b
P value 0.240 < 0.001 0.006
Kidney length, pole to pole, mm 99 ± 11 104 ± 14 105 ± 14 (0.044)b 98 ± 11 (0.066)b 105 ± 14 (0.071)b 99 ± 13 (0.090)b
P value 0.280 0.031 0.138
Acceleration time, s 0.12 ± 0.06 0.11 ± 0.07 0.07 ± 0.05 (0.003)b 0.10 ± 0.07 (0.502)b 0.10 ± 0.06 (0.249)b 0.16 ± 0.06 (0.500)b
P value 0.925 0.186 0.026
Degree of stenosis
 > 70% 47 (97.9) 38 (97.4) 0 (0.0) 31 (91.2) 1 (3.1) 15 (79.0)
 < 70% 1 (2.1) 1 (2.6) 37 (100.0) 3 (8.8) 31 (96.9) 4 (21.1)
P value > 0.999 < 0.001 < 0.001
  1. Data are shown as number (percentage) or mean ± SD. Intention-to-treat population, unpaired data. BMT best medical treatment
  2. aSome assessments could be performed in all patients
  3. b P value for analysis of change in time in pairs compared to baseline