Reducing Pseudoaneurysm and Urine Leak After Robotic Partial Nephrectomy: Results Using the Early Unclamping Technique

To present our experience using the early unclamping technique for robotic partial nephrectomy with particular attention to delayed complications, namely pseudoaneurysm and urine leak. We hypothesized that early hilar unclamping allows for improved control of end arteries and renorrhaphy after tumor resection, reducing overall delayed complications after partial nephrectomy with no increased risk of blood transfusion. This single institution retrospective review of a prospectively maintained database includes patients undergoing robotic partial nephrectomy with early unclamping technique for presumed renal malignancy between 2009 and 2018. Patient demographics and perioperative parameters are described, particularly rates of pseudoaneurysm and urine leak. Results are compared to previously published partial nephrectomy studies using various clamping and renorrhaphy techniques. Four hundred and sixty three patients were included in the study. Mean operative time and warm ischemia time were 186 and 14.7 minutes, respectively. Mean estimated blood loss was 242 cc. Thirty-day postoperative complication rate was 14.7%, with 88% of these Clavien I-II. Urine leak occurred in 1 patient (0.2%) undergoing a simultaneous partial nephrectomy and pyelothitotomy for partial staghorn stone. Postoperative transfusion rate was 1.33% and our pseudoaneurysm rate was 0%. The early unclamping technique for robotic partial nephrectomy is reliable and safe, with low pseudoaneurysm and urine leak rates which compare favorably to other published techniques.