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Page 6 of 13 Parra et al. Mini-invasive Surg 2024;8:16 https://dx.doi.org/10.20517/2574-1225.2024.01

Figure 6. Cellulose-type hemostatic material.

0-18). The average hospital stay was three days (IQR 2-5). Previous median GFR was 83 mL/min/1.73 m
2
(IQR 66.2-93.6). On the first postoperative day, the median GFR was 78.4 (SD 21.8), and at 6 months, it was
75.2 (SD 22). Tables 1-3 show the most important characteristics of our patients, whether clinical,
perioperative or with respect to their postoperative renal function.

After evaluating their correlation by means of chi-square, we found no statistically significant differences
between having hypertension or diabetes mellitus and GFR after surgery, with P values of 0.022, 0.460 and
0.103 compared with one day, 3 months and 6 months after surgery, respectively, for hypertension, and P
values of 0.106, 0.674 and 0.318 comparing with one day, 3 months and 6 months, respectively, for diabetes.
However, we found statistically significant differences in the correlation of a Charlson index ≥ 3 and
deterioration of renal function, with the P values 0.01, 0.08 and 0.00 for the postoperative day, after 3 and 6
months, respectively. These differences are shown in Figure 7. In addition, no statistically significant
differences were found in whether having a previous CKD influenced the decision to perform arterial
clamping, with a P value of 0.104.

Statistically significant differences were found in the relation, analyzed with the ANOVA test, between
R.E.N.A.L. score and ischemia time. A higher renal score was related to an ischemia time between one and
19 min (P = 0.000) as well as a higher renal score was positively related to an ischemia time ≥ 20 min (P =
0.009); while there were no statistically significant differences between a higher renal score and zero
ischemia time (P = 0.217). These differences are shown in Figure 8.

We found no statistically significant difference between ischemia time and GFR after surgery, with a P value
of 0.144 in the case of GFR on the first postoperative day, P = 0.383 in the case of GFR 3 months after
surgery and P = 0.739 6 months after surgery.

DISCUSSION
Warm ischemia time (WIT) has become a secondary factor in favor of preserved renal mass in terms of
causative factors for CKD after PN.