Left Renal Vein Division during Open Surgical Repair for Abdominal Aortic Aneurysm May Cause Long-Term Kidney Remodeling.

BACKGROUND

Left renal vein division (LRVD) is a maneuver performed during open surgical repair for abdominal aortic aneurysms. Even so, the long-term effects of LRVD on renal remodeling are unknown. Therefore, we hypothesized that interrupting the venous return of the left renal vein might cause renal congestion and fibrotic remodeling of the left kidney.

METHODS

We used a murine left renal vein ligation model with 8-week-old to 12-week-old wild-type male mice. Bilateral kidneys and blood samples were harvested postoperatively on days 1, 3, 7, and 14. We assessed the renal function and the pathohistological changes in the left kidneys. In addition, we retrospectively analyzed 174 patients with open surgical repairs between 2006 and 2015 to assess the influence of LRVD on clinical data.

RESULTS

Temporary renal decline with left kidney swelling occurred in a murine left renal vein ligation model. In the pathohistological assessment of the left kidney, macrophage accumulation, necrotic atrophy, and renal fibrosis were observed. In addition, Myofibroblast-like macrophage, which is involved in renal fibrosis, was observed in the left kidney. We also noted that LRVD was associated with temporary renal decline and left kidney swelling. LRVD did not, however, impair renal function in long-term observation. Additionally, the relative cortical thickness of the left kidney in the LRVD group was significantly lower than that of the right kidney. These findings indicated that LRVD was associated with left kidney remodeling.

CONCLUSIONS

Venous return interruption of the left renal vein is associated with left kidney remodeling. Furthermore, interruption in the venous return of the left renal vein does not correlate with chronic renal failure. Therefore, we suggest careful follow-up of renal function after LRVD.