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  • Title: Minimal effect of cold ischemia time on progression to late-stage chronic kidney disease observed long term after partial nephrectomy.
    Author: Iida S, Kondo T, Amano H, Nakazawa H, Ito F, Hashimoto Y, Tanabe K.
    Journal: Urology; 2008 Nov; 72(5):1083-8; discussion 1088-9. PubMed ID: 18822449.
    Abstract:
    OBJECTIVES: To assess the influence of cold ischemia on postoperative renal function and the new onset of late-stage chronic kidney disease during long-term follow-up after partial nephrectomy. METHODS: A total of 131 patients with renal tumors who underwent partial nephrectomy and were followed up for >or=12 months were included in the present study. Renal function was analyzed using the estimated glomerular filtration rate (e-GFR). RESULTS: We classified the subjects into 3 groups according to the length of cold ischemia time: group 1, 1-30 minutes; group 2, 31-60 minutes; and group 3, >60 minutes. Although the postoperative e-GFR was lower in group 3 than in groups 1 and 2, no significant difference was found among the 3 groups during long-term follow-up when preoperative CKD was absent. A cold ischemia time of >or=44 minutes significantly increased the probability of freedom from the new onset of an e-GFR of <45 mL/min/1.73 m(2), but this difference was minimal. Multivariate analysis showed that the preoperative e-GFR and the relative decrease of e-GFR at 1 year after surgery were the significant factors determining postoperative renal function. CONCLUSIONS: A cold ischemia time of >44 minutes appears to be a threshold influencing the new onset of late-stage CKD; however, it was not a significant factor on multivariate analysis. Thus, renal hypothermia appears to prevent the deterioration of renal function long term after surgery for patients undergoing a longer ischemia time.
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