Factors associated with postoperative renal dysfunction and the subsequent impact on survival after open juxtarenal abdominal aortic aneurysm repair.

BACKGROUND

Renal dysfunction is a well-described complication of open juxtarenal abdominal aortic aneurysm repair, but the associated risk factors and corresponding impact on survival are not well described.

METHODS

We identified all patients not on hemodialysis undergoing open repair of nonruptured juxtarenal aneurysms in the Vascular Quality Initiative from 2003 to 2017. We used mixed-effects logistic regression to determine factors associated with in-hospital postoperative renal dysfunction, including acute kidney injury (AKI, defined as serum creatinine concentration increase >0.5 mg/dL) and new renal replacement therapy (RRT), as well as the association between postoperative renal function and perioperative mortality. Cox regression was used to determine the association between postoperative renal complications and long-term survival.

RESULTS

We identified 2635 open juxtarenal repairs, of which 621 (24%) were complicated by AKI. The majority of these (20% of the overall cohort) were AKI alone, but 2.2% required temporary RRT and an additional 1.7% were permanently dialysis dependent. Factors independently associated with postoperative renal dysfunction included renal-visceral ischemia time (per minute: odds ratio [OR], 1.01 [1.01-1.02]; P < .001), clamp site (above both renal arteries: OR, 1.4 [1.1-1.8; P = .02]; supraceliac: OR, 1.7 [1.1-2.5; P = .01]), statin use (OR, 1.5 [1.1-2.0]; P = .01), male sex (OR, 1.7 [1.2-2.2]; P = .002), and preoperative renal function (glomerular filtration rate [GFR] of 45-60 mL/min/1.73 m: OR, 1.8 [1.3-2.5; P < .001]; GFR of 30-45 mL/min/1.73 m: OR, 1.9 [1.2-2.8; P = .003]; GFR of <30 mL/min/1.73 m: OR, 6.2 [3.1-12.2; P < .001]). When renal-visceral ischemia time was categorized, there was no difference in risk of postoperative renal dysfunction until >25 minutes, but risk increased stepwise thereafter (25-39 minutes: OR, 1.6 [1.2-2.1; P = .004]; 40+ minutes: OR, 2.6 [1.9-3.5; P < .001]). Neither mannitol nor the use of cold renal perfusion was associated with renal complications or mortality in the overall cohort, but cold renal perfusion was associated with lower risk of AKI when clamp times exceeded 25 minutes (OR, 0.4 [0.2-0.97]; P = .041). Postoperative renal dysfunction was associated with higher adjusted perioperative mortality (AKI: OR, 2.6 [1.4-5.0; P < .01]; RRT: OR, 10.5 [4.0-27.6; P < .001]) and significantly higher risk of long-term mortality (AKI: hazard ratio, 1.5 [1.0-2.1; P = .049]; RRT: hazard ratio, 5.8 [3.2-10.3; P < .001]).

CONCLUSIONS

Postoperative renal dysfunction, even a mild elevation in creatinine concentration, is associated with higher perioperative and long-term mortality. Although the routine use of mannitol and cold renal perfusion was not associated with postoperative renal dysfunction after open juxtarenal repair, cold renal perfusion was associated with lower risk of AKI if clamp times exceeded 25 minutes.