Hyperaccuracy Three-dimensional Reconstruction Is Able to Maximize the Efficacy of Selective Clamping During Robot-assisted Partial Nephrectomy for Complex Renal Masses.

BACKGROUND Available technologies could avoid global ischemia for the removal of a renal tumor. OBJECTIVE To present hyperaccuracy three-dimensional (HA3D) reconstruction during robot-assisted partial nephrectomy (RAPN) and compare its efficacy in sponsoring successful selective clamping of renal arterial branches during RAPN. DESIGN, SETTING, AND PARTICIPANTS Patients undergoing RAPN (January 2016-July 2017) for renal mass PADUA score ≥10 who underwent abdominal computed tomography scan with angiography. Since February 2017 HA3D reconstruction was performed. SURGICAL PROCEDURE HA3D reconstruction-aided RAPN and standard RAPN with selective clamping. MEASUREMENTS Intraoperative variables focusing on the renal arterial pedicle management and success rate of its planned management. RESULTS AND LIMITATIONS Thirty-one patients in group no HA3D and 21 in group HA3D. The median (standard deviation) tumor size was 50.9 and 50.8mm (p=0.97), and median PADUA scores 10.5 and 11 (p=0.85) for groups no HA3D and HA3D, respectively. In group no HA3D, a significantly higher number of patients underwent global ischemia (80% vs 24%, p<0.01). Of note, in 90% of the group HA3D cases, intraoperative management of the renal pedicle was performed as preoperatively planned; in 39% of the group no HA3D cases, management of the renal arterial pedicle was varied intraoperatively (p=0.04). We disclose the limited sample size and the experimental technique. CONCLUSIONS Preoperative simulation of selective ischemia was feasible and effective with HA3D reconstruction. In all the RAPN cases performed, selective clamping was successful, avoiding ischemia of the healthy renal remnant. A strict collaboration between urologists and bioengineers is mandatory to improve the technology. PATIENT SUMMARY In this report, we found that an accurate three-dimensional reconstruction of the kidney before conservative surgery for renal cancer seems to help in avoiding the global ischemia of the kidney. Further studies are needed to conclude if avoiding a percentage of ischemia to the kidney is clinically relevant.

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