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Table 3 Renal mass complexity according to R.E.N.A.L. NS in relation to outcome parameters

From: Modified R.E.N.A.L nephrometry score for predicting the outcome following partial nephrectomy

  Complexity level according to R.E.N.A.L. p
Low (4–6)
11 patients
Moderate (7–9)
20 patients
High (10–12)
20 patients
Age (years) 48.1 ± 13.1 (20–59) 50.3 ± 10.1 (34–65) 51.1 ± 16.2 (20–80) .861
BMI (kg/m2) 32 ± 6.7 (22–42) 28.5 ± 4.3 (22–36) 29.6 ± 4.9 (21–39) .117
ASA Score 1 (1–2) 1 (1–2) 2 (1–2) .441
Pre-Op eGFR (ml/min/1.73m2) 86.1 ± 20.9 (55–141) 76.9 ± 18.6 (43–126) 91 ± 30 (40–140) .183
Pre-Op Hb (gm/dl) 14.1 ± 1.05 (13–15.9) 13.2 ± 1.8 (10.5–16.4) 12.6 ± 1.7 (9.1–15.5) .064
Sex: male/female 7 (63.6%)/4 (36.4%) 13 (65%)/7 (35%) 9/(45%)/11 (55%) .388
Side: right/left 8 (72.7%)/3 (27.3%) 12 (60%)/8 (40%) 10 (50%)/10 (50%) .465
CKD (ml/min/1.73m2)     .104
 > 90 4/11 (36.4%) 3/20 (15%) 10/20 (50%)
 60–89 6/11 (54.5%) 14/20 (70%) 6/20 (30%)
 30–59 1/11 (9.1%) 3/20 (15%) 4/20 (20%)
Clinical T     .095
 T1 10/11 (90.9%) 15/20 (75%) 11/20 (55%)
 T2 1/11 (9.1%) 5/20 (25%) 9/20 (45%)
OR time (h) 2.6 ± 0.57 (1.7–3.5) 3.1 ± 0.78 (2–5) 3.03 ± 0.65 (2–4.5) .174
WIT (min) 14 (0–20) 15 (0–30) 19 (0–40) .343
LOS (days) 4 (3–9) 5 (4–29) 5 (4–11) .109
Hb loss (gm/dl) 1 (0.4–3.5) 1 (0.2–3.7) 1 (0.1–5.3) .788
Blood loss (ml) 150 (50–1500) 300 (100–900) 300 (50–1100) .272
Ischemia type     .251
 Warm ischemia 7/11 (63.6%) 18/20 (90%) 15/20 (75%)
 No ischemia 4/11 (36.4%) 2/20 (10%) 5/20 (25%)
Hilar position 0/11 3/20 (5.9%) 7/20 (13.7%) .053
RPS     
 Intrarenal/extrarenal 7 (63.6%)/4 (36.4%) 14 (70%)/6 (30%) 14 (70%)/6 (30%) .922
PCS entry 5/11 (45.5%) 8/20 (40%) 13/20 (65%) .263
Post-Op Hb (gm/dl) 12.6 ± 1.5 (10 - 14.3) 11.9 ± 1.6 (9 - 15.8) 11.3 ± 2 (7.1–15) .148
Total complications 2/11 (18.2%) 9/20 (52.9%) 6/20 (30%) .292
Secondary intervention 2/11 (18.2%) 7/20 (35%) 1/20 (5%) .039*
VC 1/11 (9.1%) 2/20 (10%) 1/20 (5%) 1
Ureteric injury 0/11 2/20 (10%) 0/20 .341
Blood transfusion 2/11 (18.2%) 3/20 (15%) 4/20 (20%) 1
Leakage 0/11 5/20 (25%) 1/20 (5%) .124
Drain removal (d) 4 (3–8) 4.5 (3–28) 5 (4–7) .243
Conversion to RN 1/11 (9.1%) 1/20 (5%) 2/20 (10%) 1
RF impairment 1/11 (9.1%) 2/20 (10%) 3/20 (11.8%) 1
Positive margin 0/11 1/20 (5%) 2/20 (10%) .789
Post-Op eGFR 3mo (ml/min/1.73m2) 78.6 ± 17.5 (60–114.3) 74.8 ± 19.3 (32–117) 80.1 ± 27 (21.8–130) .750
  1. Values are presented as mean ± SD (range), Median (range) or number of patients (%) as appropriate
  2. AML angiomyolipoma, ASA American society of anesthesiology, BMI body mass index, CKD chronic kidney disease, eGFR estimated glomerular filtration rate, Hb hemoglobin, LOS length of hospital stay, OR operative, PCS pelvi-calyceal system, Post-Op postoperative, Pre-Op preoperative, RF renal function, RN radical nephrectomy, RPS renal pelvic score, VC vascular complications, WIT warm ischemia time
  3. *Significant