Lymphovenous Coupler-Assisted Bypass for Immediate Lymphatic Reconstruction

Area of Science:

• Surgical innovation in oncology
• Lymphedema prevention strategies
• Microsurgical techniques

Background:

• Breast cancer-related lymphedema is a common complication following axillary lymph node dissection (ALND).
• Lymphovenous bypass (LVB) performed during ALND may prevent lymphedema, but long-term outcomes and anastomotic patency remain incompletely understood.
• This study investigates the feasibility and effectiveness of immediate lymphatic reconstruction using coupler-assisted bypass (CAB).

Purpose of the Study:

• To evaluate the feasibility and outcomes of prophylactic lymphovenous bypass using the coupler-assisted bypass (CAB) technique.
• To compare the efficacy of CAB with the standard end-to-end (E-E) suturing technique for lymphatic reconstruction.
• To assess the long-term patency and lymphedema development rates associated with CAB.

Main Methods:

• A retrospective review of patients undergoing prophylactic LVB post-ALND between 2018 and 2022 at two tertiary care centers.
• Patients were stratified into cohorts receiving either standard E-E suturing or the CAB technique.
• Lymphedema assessment involved quantitative and qualitative evaluations at multiple postoperative time points (3, 6, 12, and 24 months).

Main Results:

• A total of 63 LVBs were performed: 24 with CAB and 39 with standard E-E suturing.
• The CAB technique facilitated bypassing a greater number of lymphatics per vein (2.6 vs. 1.7) and to larger veins (2.2 mm vs. 1.2 mm) compared to standard.
• At a median follow-up of 14.7 months, lymphedema developed in 9.1% of CAB recipients, comparable to 4.8% in the standard group, albeit with a shorter follow-up for the latter.

Conclusions:

• The coupler-assisted bypass (CAB) technique presents a feasible and effective alternative to standard lymphovenous bypass for prophylactic lymphatic reconstruction.
• CAB demonstrates potential for maintaining long-term anastomotic patency, likely due to simplified anastomosis of multiple lymphatics to larger veins.
• This technique may reduce the technical complexity of prophylactic lymphovenous bypass, improving outcomes for patients undergoing axillary lymph node dissection.