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Practice patterns and choice of technological instruments in PCNL are not always standardized. There are no previous reports on the PCNL practice tendencies and patterns in Latin America. The aim of the study is to describe the current practice patterns of PCNL among the members of the Mexican Society of Urology (“Sociedad Mexicana de Urologia”). Observational and descriptive study. A 9-item closed questionnaire on PCNL practice patterns was answered by members of the Mexican Society of Urology in a secure website hosted survey after e-mail invitation. A descriptive numerical and graphical analysis was performed. A total of 90 contestants were registered out of 492 potential participants. PCNL is performed by 80 % of the participants, with an average of 16 procedures per year. Percutaneous tracts are commonly obtained by urologists on the same day of the procedure. Sequential and telescopic dilators are equally preferred over balloons. The pneumatic litotriptor is the most common choice and CT scan and X-ray are equally used as follow-up. The practice patterns of PCNL from Mexican urologists are different from other international reports. Influence of socio-economic circumstances is inferred.

INTRODUCTION AND OBJECTIVES: Renal function behavior of the donor patient after nephrectomy seems to be related to recipient’s shortand long-term renal function. The objective of this study is to determine if there is relationship between donor and recipient renal function after renal transplantation. METHODS: A retrospective review of our institutional prospectively maintained renal transplant database was performed. Donor-recipient couples were selected for analysis. Estimated glomerular filtration rate (eGFR) using the CKD-EPI formula was calculated. Preoperative and 1 month postoperative eGFR from the donor was used to calculate the improvement in eGFR (“GFRd improvement”). eGFR for the recipient (GFRr) was calculated at 1 and 2 years follow-up. “GFRd improvment” was classified in 3 groups as: 1) a decrease 20% or any increase, 2) a decrease 20% but 40%; and 3) a decrease 40%. GFRr was dichotomized in two groups with 60 ml/min as cut-off point. GFRr differences according to “donor change” groups were calculated. A logistic regression analysis was done to define the impact of “donor change” groups in GFRr. RESULTS: Ninety-six donor-recipient couples were identified. Preoperative and 1 month postoperative donor eGFR were 105.9 16.4 ml/min and 72.5 15.4 ml/min, respectively. Mean “GFRd improvement” was -34.4 14.4%. GFRr was 72.8 20.6 ml/min at year 1 and 79.5 27.6 at year 2 of follow-up. GFRr according to “GFRd improvement” groups was 81.47 11.3 ml/min for group 1, 78.9 20.0 for group 2 and 63.9 19.5 for group 3 (p 0.01). A significant correlation between “GFRd improvement” and GFRr at year 1 was found (Rho 0.252, p 0.04). No correlation was found with GFRr at year 2. Using a logistic regression analysis, “GFRd improvement” classification is a predictor of GFRr 60 ml/min at year 1 (HR 3.879 CI 1.327-11.335, p 0.013). CONCLUSIONS: A sooner improvement of eGFR from donor patients in the first month after donor-nephrectomy is a significant predictor of better eGFR in the recipient after the first year from the transplant.