Time-dependent variations in urine output after renal transplantation

Area of Science:

• Nephrology
• Transplantation Medicine
• Urology

Background:

• Diuresis commences shortly after renal transplantation.
• Early post-kidney transplant urine volume may be linked to favorable short- and long-term allograft survival, though this remains debated.
• This study investigated changes in urine volume within six months post-renal transplantation.

Purpose of the Study:

• To analyze the trend of urine volume in the initial six months following renal transplantation.
• To explore the correlation between early urine output and graft function markers.

Main Methods:

• Prospective study involving 54 renal transplant recipients with stable kidney function and no rejection evidence.
• Measurement of daily urine volume and first-month serum creatinine at 24, 48 hours, and 1 month post-transplant.
• Follow-up of 15 patients for urine output up to 6 months, with statistical analysis using ANOVA and Pearson correlation.

Main Results:

• Mean urine output decreased from 10.06 L at 24 hours to 3.44 L at 1 month post-transplant (P<.05).
• Urine volumes at 1 month and 6 months were comparable (3.20 L at 6 months, P>.05).
• A positive correlation was observed between first-month serum creatinine and one-month urine volume (r=0.302, P=.035).

Conclusions:

• Urine volume stabilizes by one month post-renal transplantation, despite early fluctuations.
• Stabilized urine output is positively correlated with first-month serum creatinine levels.
• In stable patients, final urine output reflects early renal allograft function.