Is three-dimensional laparoscopic spleen preserving splenic hilar lymphadenectomy for gastric cancer better than that of two-dimensional? Analysis of a prospective clinical research study

Three-dimensional (3D) systems for laparoscopy provide surgeons with additional information on spatial depth not found in two-dimensional (2D) systems. This study enrolled 156 spleen-preserving splenic hilar lymphadenectomy (LSPSHL) patients in a randomized controlled trial (ClinicalTrials.gov Identifier NCT02327481) at the department of gastric surgery at Fujian Medical University Union Hospital between January 2015 and April 2016. The short-term efficacies were compared between the treatment groups. The unedited videos of 80 LSPSHL (40 procedures each for 3D and 2D) were rated for technical performance using the Generic Error Rating Tool. The data for 156 LSPSHL patients indicate that the estimated blood loss (EBL) (3D vs 2D = 66.3 vs. 99.0, P= 0.046) was significantly less in the 3D group. The postoperative recovery and complication rates were similar (P> 0.05). And there were no deaths within 30 days of surgery. Two observers analyzed 80 videos of LSPSHL. The results showed that there were fewer grasping-errors made in the 3D group than in the 2D group when dissecting the inferior pole region of spleen (IPRS) (P= 0.016) and the superior pole region of spleen (SPRS) (P= 0.022). Additionally, the inter-rater reliability was high regarding grasping-errors in the IPRS (intraclass correlation coefficient (ICC) 0.92) and in the SPRS (ICC 0.83). The ICC for the total number of errors was 0.82. The mean of errors in the 3D group (3D vs. 2D = 20.7 vs. 23.5, P= 0.022) was less than the 2D group. Compared with 2D LSPSHL, 3D technology reduces EBL and technical errors during splenic hilar dissection.