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Original Article
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Volume 349:115-124 July 10, 2003 Number 2
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The Renal Arterial Resistance Index and Renal Allograft Survival
Jörg Radermacher, M.D., Michael Mengel, M.D., Sebastian Ellis, M.D., Stephan Stuht, M.D., Markus Hiss, M.D., Anke Schwarz, M.D., Ute Eisenberger, M.D., Michael Burg, M.D., Friedrich C. Luft, M.D., Wilfried Gwinner, M.D., and Hermann Haller, M.D.

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ABSTRACT

Background Most renal transplants fail because of chronic allograft nephropathy or because the recipient dies, but no reliable factor predicting long-term outcome has been identified. We tested whether a renal arterial resistance index of less than 80 was predictive of long-term allograft survival.

Methods The renal segmental arterial resistance index (the percentage reduction of the end-diastolic flow as compared with the systolic flow) was measured by Doppler ultrasonography in 601 patients at least three months after transplantation between August 1997 and November 1998. All patients were followed for three or more years. The combined end point was a decrease of 50 percent or more in the creatinine clearance rate, allograft failure (indicated by the need for dialysis), or death.

Results A total of 122 patients (20 percent) had a resistance index of 80 or higher. Eighty-four of these patients (69 percent) had a decrease of 50 percent or more in creatinine clearance, as compared with 56 of the 479 patients with a resistance index of less than 80 (12 percent); 57 patients with a higher resistance index (47 percent) required dialysis, as compared with 43 patients with a lower resistance index (9 percent); and 36 patients with a higher resistance index (30 percent) died, as compared with 33 patients with a lower resistance index (7 percent) (P<0.001 for all comparisons). A total of 107 patients with a higher resistance index (88 percent) reached the combined end point, as compared with 83 of those with a lower resistance index (17 percent, P<0.001). The multivariate relative risk of graft loss among patients with a higher resistance index was 9.1 (95 percent confidence interval, 6.6 to 12.7). Proteinuria (protein excretion, 1 g per day or more), symptomatic cytomegalovirus infection, and a creatinine clearance rate of less than 30 ml per minute per 1.73 m2 of body-surface area after transplantation also increased the risk.

Conclusions A renal arterial resistance index of 80 or higher measured at least three months after transplantation is associated with poor subsequent allograft performance and death.


Source Information

From the Departments of Nephrology (J.R., S.E., S.S., M.H., A.S., U.E., M.B., W.G., H.H.) and Pathology (M.M.), Hannover Medical School, Hannover, Germany; and the Franz Volhard Clinic, HELIOS Klinikum-Berlin, Humboldt University of Berlin, Berlin, Germany (F.C.L.).

Address reprint requests to Dr. Radermacher at the Department of Nephrology, Medizinische Hochschule Hannover, P.O. Box 61 01 80, D-30625 Hannover, Germany, or at radermacher.joerg{at}mh-hannover.de.

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Related Letters:

Renal Arterial Resistance Index
Giraudeau B., Halimi J.-M., Jay S. J., Pape L., Offner G., Ehrich J. H.H., Radermacher J., Stuht S., Haller H.
Extract | Full Text | PDF  
N Engl J Med 2003; 349:1573-1574, Oct 16, 2003. Correspondence

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