Robotic Vessel Sealer Device for Lymphocele Prevention After Pelvic Lymphadenectomy: Results of a Randomized Trial.

Pelvic lymph node dissection (PLND) during robotic prostatectomy is associated with potential complications. The most common complication of PLND is lymphoceles, occurring in up to 50% of patients in studies with screening imaging but usually asymptomatic. We performed a prospective randomized trial to evaluate whether using advanced bipolar energy for PLND via the robotic vessel sealer can prevent lymphoceles. A total of 120 patients were enrolled in the trial with each patient serving as their own control. Robotic PLND was randomly performed using the vessel sealer on one side and standard PLND using clips on the other side. All patients underwent screening computed tomography scan 3 months postoperatively with radiologists blinded to the assigned technique. Significant lymphoceles were defined as fluid collections ≥3 cm in any plane. Of those enrolled, 114 completed the study. The mean nodal yield was 6.5 nodes, with 3.1 versus 3.4 nodes for vessel sealer side versus standard technique ( = .35), respectively. The mean operative time for PLND was 11.3 versus 11.1 minutes ( = .62), respectively. Twenty-two lymphoceles were identified. Ten occurred on the vessel sealer side versus 12 on the standard side (8.8% versus 10.5%,  = .412). All lymphoceles were asymptomatic. While the robotic advanced bipolar device did not appear to prevent lymphoceles, the vessel sealer also did not increase the rate of lymphoceles compared with a standard technique using clips. Both techniques were equally efficacious, efficient, and safe for PLND such that surgeons who prefer to avoid clips can reasonably use the vessel sealer, although at increased cost. Clinical Trial Registration number: NCT02035475.