Allograft function and muscle mass evolution after kidney transplantation.

Area of Science:

• Nephrology
• Transplantation Medicine
• Muscle Physiology

Background:

• Advanced chronic kidney disease is linked to muscle wasting.
• The relationship between glomerular filtration rate (GFR) recovery post-kidney transplant and muscle mass remains unclear.

Purpose of the Study:

• To investigate the association between kidney transplant recipients' allograft function, muscle mass, and clinical outcomes.
• To explore the interplay between GFR recovery and muscle mass changes over time.

Main Methods:

• Simultaneous measurement of GFR (using iohexol plasma clearance; ioGFR) and creatinine excretion rate (CER; a muscle mass surrogate) at 3 months and later post-transplant.
• Multivariable analyses to identify predictors of muscle mass and outcomes.
• Cox regression analysis to assess the association of muscle mass with mortality and graft loss.

Main Results:

• Reduced early GFR (ioGFR3) independently predicted lower muscle mass (CER3).
• Early GFR was also a predictor of muscle mass at follow-up.
• Lower muscle mass at 3 months or follow-up was associated with increased mortality, but not graft loss.

Conclusions:

• GFR recovery is a key factor influencing muscle mass changes after kidney transplantation.
• Interventions aimed at increasing muscle mass early post-transplant could be beneficial for recipients.