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The impact of aortic endografts on renal function


, : The impact of aortic endografts on renal function. Journal of Vascular Surgery 41(6): 926-930

Objective: To determine the impact on late postoperative renal function of supra-renal and infrarenal fixation of endografts used to treat infrarenal abdominal aortic-aneurysm (AAA). Methods: Retrospective analysis of 277 patients treated from 2000 to 2003 with three different endografts at two clinical centers. Five patients on dialysis for preoperative chronic renal failure were excluded. Group IF of 135 patients treated with an infraternal device (Medtronic AneuRx) was compared with group SF of 137 patients treated with a suprarenal device (106 Cook Zenith and 31 Medtronic Talent). Renal function was evaluated by calculating preoperative and latest postoperative creatinine clearance (CrCl) using the Cockcroft formula. Patients who developed a >20% decrease in CrCl were considered to have significantly impaired renal function.Results. There were no significant differences in patient age, sex, aneurysm size, preoperative risk factors, dose of intra-and postoperative contrast, or baseline CrCl (IF: 69.3 mL/min, SF: 71.7 mL/min, P =.4). Follow-up time of 12.2months was the same in both groups. CrCl decreased significantly during the follow-up period-in both groups (IF: 69.3 mL/min to 61.7 mL/min, P <.01; SF: 71.7 mL/min to 64.9 mL/min, P <.03). Postoperative CrCl (IF: 61.7 mL/min, SF: 64.9 mL/min, P =.3), and the rate of CrCl decrease during the follow-up period (IF: - 10.9%) SF: - 9.5%, P =.2) was not different between the two groups. The number of patients with a >20% decrease in CrCl was not different between the two groups (IF: n = 35 [25.9%], SF: n = 41 [29.9%], P =.46). However, the magnitude of decrease in CrCl in patients with renal impairment was greater in patients treated with suprarenal fixation endografts (SF: -39%) compared with those treated with infrarenal endografts (IF: - 31%, P =.005). This greater degree of renal impairment was not due to identifiable differences in preoperative risk factors, age, or baseline CrCl. No patients in these series required dialysis.Conclusions. Regardless the type of endograft used, there is a 10% decrease inCrCl in the first year after endovascular aneurysm repair. Suprarenal fixation does not seem to increase the likelihood of postoperative renal impairment. Decline in renal function over time after endovascular aortic repair is probably due to multiple factors, and measures known to be effective in protecting kidneys should be considered for these patients. Long-term follow-up with measurement of CrCl, along with renal imaging and regular blood pressure measurements, should be performed to detect-possible late renal dysfunction. Prospectivestudies comparing suprarenal versus infrarenal fixation are needed to confirmthose results.

US$19.90

PMID: 15944586

DOI: 10.1016/j.jvs.2005.02.024


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