Observational Study
Copyright ©The Author(s) 2021.
World J Nephrol. Mar 25, 2021; 10(2): 8-20
Published online Mar 25, 2021. doi: 10.5527/wjn.v10.i2.8
Table 1 Patients’ characteristics and renal function (entire study cohort)

Total (n = 421)
Control (n = 342)
LMWD (n = 79)
P value
Sex
Male281 (66.7) 219 (64.0) 62 (78.5) 0.017
Female140 (33.3) 123 (36.0) 17 (21.5)
Age, yr75.0 [69.0, 80.0]76.0 [69.0, 80.0]74.0 [68.0, 79.0]0.178
Body mass index, kg/m224.0 [21.1, 26.2]23.9 [21.1, 26.0]24.4 [21.3, 26.6]0.273
Procedure
Coronary angiography279 (66.3) 238 (69.6) 41 (51.9) 0.004
PCI142 (33.7) 104 (30.4) 38 (48.1)
Diagnosis
Stable CAD350 (83.1) 288 (84.2) 62 (78.5) 0.243
Acute coronary syndrome71 (16.9) 54 (15.8) 17 (21.5)
Prior myocardial infarction155 (36.8) 106 (31.0) 49 (62.0) < 0.001
Prior PCI209 (49.6) 148 (43.3) 61 (77.2) < 0.001
Prior CABG22 (5.2) 20 (5.8) 2 (2.5) 0.397
Hypertension266 (63.2) 210 (61.4) 56 (70.9) 0.122
Dyslipidemia178 (42.3) 140 (40.9) 38 (48.1) 0.257
Diabetes mellitus218 (51.8) 172 (50.3) 46 (58.2) 0.214
Stroke21 (5.0) 20 (5.8) 1 (1.3) 0.147
Current smoking56 (13.3)35 (10.2) 21 (26.6) < 0.001
Serum creatinine, mg/dL1.33 [1.22, 1.56]1.33 [1.20, 1.52]1.36 [1.27, 1.62]0.057
eGFR, mL/min/1.73 m238.4 [32.9, 42.3]38.5 [32.6, 42.4]36.9 [33.1, 41.8]0.368
GFR category
3b (30 ≤ eGFR < 45)352 (83.6)284 (83.0)68 (86.1)0.783
4 (15 ≤ eGFR < 30)64 (15.2)54 (15.8)10 (12.6)
5 (eGFR < 15)5 (1.2)4 (1.2)1 (1.3)
Hemoglobin A1c, %6.3 [5.8, 6.9]6.3 [5.7, 7.0]6.4 [6.0, 6.9]0.109
Low-density lipoprotein cholesterol, mg/dL86 [71, 107]87 [72, 108]82 [70, 103]0.301
Hemoglobin, g/dL11.8 [10.5, 13.4]11.8 [10.5, 13.4]12.1 [10.9, 13.5]0.375
C-reactive protein, mg/dL0.14 [0.05, 0.42]0.13 [0.05, 0.40]0.15 [0.06, 0.53]0.180
NT-proBNP, pg/mL864.5 [279.8, 3471.3]991.0 [288.3, 3700.0]633.0 [177.3, 1775.5]0.099
LVEF, %57 [44, 66]58 [44, 66]52 [43, 63]0.140
Mehran risk score8 [6, 11]8 [6, 11]8 [7, 11]0.710
Catheterization procedure
Total agent volume, mL150.0 [103.0, 226.0]133.0 [92.0, 192.3]207.0 [167.5, 271.8]< 0.001
Total contrast volume, mL135.0 [95.0, 193.0]133.0 [92.0, 192.3]140.0 [102.0, 195.0]0.618
LMWD volume, mL0.0 [0.0, 0.0]0.0 [0.0, 0.0]67.6 [43.3, 86.0]< 0.001
OCT79 (40.6) 92 (26.9)79 (100.0) < 0.001
Renal function post-procedure
ΔCre within 5 d, mg/dL−0.01 [-0.11, 0.13]0.00 [-0.10, 0.14]−0.03 [-0.14, 0.12]0.414
ΔCre at 1 mo, mg/dL−0.01 [-0.15, 0.11]-0.01 [-0.16, 0.11]-0.01 [-0.13, 0.09]0.686
ΔCre at 1 yr, mg/dL0.01 [-0.13, 0.18]0.00 [-0.14, 0.16]0.07 [-0.04, 0.34]0.004
Acute kidney injury51 (12.1) 42 (12.3) 9 (11.4) 1.000
Worsening renal function (ΔCre ≥ 0.3 mg/dL/1 yr) 80 (19.0) 58 (17.0) 22 (27.8) 0.039
Table 2 Patients’ characteristics and renal function (matched cohort)

Total (n = 150)
Control (n = 75)
LMWD (n = 75)
P value
Sex
Male119 (79.3) 61 (81.3) 58 (77.3) 0.687
Female31 (20.7) 14 (18.7) 17 (22.7)
Age, yr75.0 [67.5, 80.0]75.0 [69.0, 80.0]74.0 [67.0, 79.5]0.643
Body mass index, kg/m223.7 [21.0, 25.9]23.0 [20.8, 25.4]24.5 [21.3, 26.8]0.030
Procedure
Coronary angiography84 (56.0) 43 (57.3) 41 (54.7) 0.869
PCI66 (44.0) 32 (42.7) 34 (45.3)
Diagnosis
Stable CAD121 (80.7) 61 (81.3) 60 (80.0) 1.000
Acute coronary syndrome29 (19.3) 14 (18.7) 15 (20.0)
Prior myocardial infarction77 (51.3) 30 (40.0) 47 (62.7) 0.009
Prior PCI93 (62.0) 34 (45.3) 59 (78.7) < 0.001
Prior CABG4 (2.7)2 (2.7)2 (2.7)1.000
Hypertension98 (65.3) 45 (60.0) 53 (70.7) 0.230
Dyslipidemia63 (42.0) 28 (37.3) 35 (46.7) 0.321
Diabetes mellitus81 (54.0) 37 (49.3) 44 (58.7) 0.326
Stroke5 (3.3) 4 (5.3) 1 (1.3) 0.367
Current smoking29 (19.3) 9 (12.0) 20 (26.7) 0.037
Serum creatinine, mg/dL1.36 [1.25, 1.63]1.37 [1.26, 1.71]1.35 [1.25, 1.61]0.612
eGFR, mL/min/1.73 m237.6 [32.8, 42.0]38.0 [31.0, 42.2]37.0 [33.2, 41.8]0.949
GFR category
3b (30 ≤ eGFR < 45)125 (83.3)59 (78.7)66 (88.0)0.189
4 (15 ≤ eGFR < 30)25 (16.7)16 (21.3)9 (12.0)
5 (eGFR < 15)0 (0.0)0 (0.0)0 (0.0)
Hemoglobin A1c, %6.3 [5.9, 6.9]6.1 [5.7, 6.9]6.5 [6.0, 7.0]0.058
Low-density lipoprotein cholesterol, mg/dL87 [70, 108]88 [72, 114]81 [70, 103]0.155
Hemoglobin, g/dL11.8 [10.5, 13.4]11.5 [10.3, 13.5]12.1 [10.9, 13.3]0.230
C-reactive protein, mg/dL0.14 [0.05, 0.46]0.12 [0.05, 0.35]0.15 [0.06, 0.53]0.320
NT-proBNP, pg/mL835.5 [244.8, 3265.3]1560.0 [270.0, 4268.5]632.0 [175.0, 1679.5]0.076
LVEF, %53 [43, 64]56 [44, 64]52 [43, 63]0.697
Mehran risk score8 [7, 11]8 [7, 11]8 [7, 11]0.548
Catheterization procedure
Total agent volume, mL174.1 [120.0, 244.8]130.0 [88.0, 196.5]209.7 [170.1, 271.8]< 0.001
Total contrast volume, mL138.0 [97.5, 200.0]130.0 [88.0, 196.5]142.0 [104.5, 200.0]0.408
LMWD volume, mL7.6 [0.0, 68.2]0.0 [0.0, 0.0]68.5 [43.9, 86.0]< 0.001
OCT95 (63.3)20 (26.7)75 (100.0) < 0.001
Renal function post-procedure
ΔCre within 5 d, mg/dL-0.03 [-0.15, 0.13]-0.04 [-0.15, 0.14]-0.03 [-0.14, 0.10]0.848
ΔCre at 1 mo, mg/dL-0.03 [-0.17, 0.09]-0.06 [-0.23, 0.10]-0.02 [-0.14, 0.08]0.276
ΔCre at 1 yr, mg/dL0.01 [-0.14, 0.19]-0.04 [-0.23, 0.08]0.06 [-0.06, 0.29]0.001
Acute kidney injury14 (9.3) 7 (9.3) 7 (9.3) 1.000
Worsening renal function (ΔCre ≥ 0.3 mg/dL/1 yr) 28 (18.7) 9 (12.0) 19 (25.3) 0.059
Table 3 Univariable and multivariable logistic regression model for predicting worsening renal function (ΔCre ≥ 0.3 mg/dL/1-year) in matched cohort
VariableUnivariable
Multivariable
OR
95%CI lower limit
95%CI upper limit
P value
OR
95%CI lower limit
95%CI upper limit
P value
Female1.72 0.68 4.39 0.256
Age0.96 0.92 0.99 0.036 Not selected
Body mass index, kg/m21.02 0.92 1.13 0.759
PCI1.61 0.70 3.67 0.260
Acute coronary syndrome1.920.75 4.95 0.175
Prior myocardial infarction1.33 0.58 3.050.496
Prior PCI1.68 0.69 4.110.258
Hypertension0.95 0.40 2.23 0.897
Diabetes mellitus2.04 0.86 4.87 0.107
Stroke1.09 0.12 10.20 0.938
Current smoking1.170.43 3.22 0.756
eGFR < 38.4 mL/min/1.73 m24.18 1.58 11.000.004 4.27 1.59 11.40 0.004
LVEF, %0.98 0.951.01 0.220
Mehran risk score1.07 0.98 1.17 0.127
Total agent volume, mL1.00 0.99 1.01 0.533
Total contrast volume, mL0.99 0.99 1.01 0.776
LMWD volume ≥ 52 mL2.76 1.196.37 0.018 2.83 1.18 6.76 0.019