Abstract

Background: Few studies have been done on free water excretion capacity in renal transplant recipients. Objectives: This study was designed to compare electrolyte free water clearance (E-CH2O) in renal transplant recipients with healthy control group. Methods: A cross-sectional study was conducted to determine three-hour creatinine clearance (CCl), E-CH2O, and percent urine output in 3 hours after administering 20 mL/Kg oral water loading following 12-hour fasting, in 22 renal transplant recipients with good graft function (creatinine 0.05), the E-CH2O (1.83 ± 1.22 vs. 2.94 ± 2.02) and 3-hour urine output percent (55.93 ± 22.86 vs74.11 ± 30.38) in kidney recipients was significantly lower than healthy controls (P < 0.05). There wasn’t any significant correlation between E-CH2O and 3h-CCl in renal transplant recipients. Donor source and gender did not affect 3h-CCl and E-CH2O in renal transplant patients. Conclusions: This study demonstrated that E-CH2O has been decreased in renal transplant patients in comparison with control group when there was not any difference between3h- CCl in two groups. This indicates that E-CH2O may be decreased earlier than 3h-CCl in transplant patients.

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