Table 1 Correlation matrix of blood pressure indices and other variables

From: Ratio of diastolic to systolic blood pressure represents renal resistive index

 

SBP

DBP

D/S ratio

PP

Age

0.135 (−0.022 to 0.285)

−0.243 (−0.385 to −0.090)

−0.444** (−0.309 to −0.562)

0.359** (0.214 to 0.488)

BMI

0.145 (−0.016 to 0.299)

0.219 (0.060 to 0.366)

0.105 (−0.057to 0.262)

0.009 (−0.152 to 0.170)

U-pro

0.034 (−0.140 to 0.205)

−0.139 (−0.305 to 0.035)

−0.194 (−0.355 to −0.022)

0.152 (−0.022 to 0.316)

PRA

−0.088 (−0.252 to 0.082)

−0.042 (−0.209 to 0.128)

0.030 (−0.140 to 0.197)

−0.079 (−0.244 to 0.091)

PAC

−0.018 (−0.187 to 0.151)

0.064 (−0.106 to 0.230)

0.090 (−0.081 to 0.255)

−0.070 (−0.236 to 0.101)

eGFR

−0.151 (−0.301 to 0.007)

0.023 (−0.135 to 0.180)

0.184 (0.027 to 0.332)

−0.206 (−0.352 to −0.050)

Trunk

PSV

−0.020 (−0.180 to 0.140)

−0.203 (−0.351 to –0.045)

−0.221 (−0.367 to –0.063)

0.133 (−0.027 to 0.287)

EDV

−0.102 (−0.257 to 0.059)

0.228 (0.071 to 0.374)

0.371** (0.225 to 0.501)

−0.304* (−0.443 to −0.152)

RI

0.101 (−0.061 to 0.258)

−0.412** (−0.537 to −0.269)

−0.585** (−0.681 to −0.468)

0.444** (0.305 to 0.565)

Hilum

PSV

−0.020 (−0.184 to 0.145)

−0.090 (−0.250 to 0.075)

−0.092 (−0.252 to 0.074)

0.044 (−0.121 to 0.207)

EDV

0.045 (−0.120 to 0.208)

0.260 (0.100 to 0.407)

0.235 (0.074 to 0.384)

−0.144 (−0.301 to 0.020)

RI

0.084 (−0.082 to 0.244)

−0.385** (−0.517 to −0.236)

−0.542** (−0.649 to −0.415)

0.399** (0.252 to 0.529)

Segmental

PSV

0.061 (−0.100 to 0.218)

−0.123 (−0.277 to 0.038)

−0.218 (–0.365 to −0.060)

0.181 (0.021 to 0.331)

EDV

0.014 (−0.171 to 0.174)

0.228 (0.071 to 0.375)

0.253 (0.096 to 0.397)

−0.172 (−0.324 to −0.012)

RI

0.126 (−0.034 to 0.279)

−0.413** (–0.537 to −0.272)

−0.641** (−0.726 to −0.536)

0.513** (0.385 to 0.621)

Interlobar

PSV

0.065 (−0.096 to 0.222)

−0.084 (−0.241 to 0.076)

−0.178 (−0.329 to −0.019)

0.146 (−0.014 to 0.299)

EDV

−0.011 (−0.171 to 0.150)

0.302* (0.149 to 0.441)

0.364** (0.216 to 0.495)

−0.250 (–0.394 to −0.093)

RI

0.116 (−0.045 to 0.270)

−0.402** (–0.528 to −0.259)

−0.612** (−0.703 to −0.502)

0.461** (0.325 to 0.578)

LPP

0.034 (−0.124 to 0.191)

0.194 (0.037 to 0.341)

0.189 (0.032 to 0.336)

−0.110 (−0.263 to 0.049)

Aortic PSV

−0.000 (−0.158 to 0.157)

−0.064 (−0.219 to 0.095)

−0.078 (−0.233 to 0.080)

0.050 (−0.109 to 0.206)

  1. In all four of the regions where the renal Doppler ultrasonography was performed, RI showed strong negative correlations with D/S ratio and moderate correlations with DBP and PP
  2. BMI body mass index, D/S ratio ratio of diastolic to systolic blood pressure, DBP diastolic office blood pressure, EDV end-diastolic velocity, eGFR estimated glomerular filtration rate, LPP pole-to-pole kidney length, PAC plasma aldosterone concentration, PP pulse pressure, PRA plasma renin activity, PSV peak systolic velocity, RI resistive index, SBP systolic office blood pressure, U-pro protein level in urine
  3. *p < 0.001; **p < 0.0001