Preliminary experience of oblique occlusion technique in robot-assisted infrahepatic inferior vena cava thrombectomy: step-by-step procedures and short term outcomes.

Background: We aimed to compare the oncological outcomes between the oblique occlusion technique and the traditional technique for robot-assisted radical nephrectomy (RARN) with inferior vena cava (IVC) thrombectomy, and to explore the safety and effectiveness of the oblique occlusion technique.

Methods: Overall, 21 patients with renal cell carcinoma (RCC) and IVC tumor thrombus (TT) were admitted to our hospital from August 2019 to June 2020. All the patients underwent RARN with IVC thrombectomy, of which the IVC oblique occlusion technique was used in 11 patients and traditional occlusion technique was used in 10 patients. The oblique occlusion technique refers to oblique blocking from the upper corner of the right renal vein to the lower corner of the left renal vein using a vessel tourniquet or a vessel clamp (left RCC with IVCTT as an example).

Results: Compared with patients in the traditional group, those in the oblique group had lower serum creatinine at follow-up (3 month) (95 ± 21.1 vs. 131 ± 30.7 μmol/L, P = 0.03). There was no significant difference in operation time [149 (IQR 143-245) min vs. 148 (IQR 108-261) min, p = 0.86], IVC clamping time [18 (IQR 12-20) min vs. 20 (IQR 14-23) min, p = 0.41], and estimated intraoperative blood loss [300 (IQR 100-800) mL vs. 500 (IQR 175-738) mL, p = 0.51] between both groups. During a 16-month (range, 15-23 months) follow-up period, two cases progressed in the oblique group and three cases progressed in the traditional group.

Conclusions: The modified IVC oblique occlusion technique procedure is relatively safe and effective in RARN with IVC thrombectomy. The IVC oblique occlusion technique may play a role in the protection of renal function.