Pre- and Post-Kidney Transplant Abdominal Computed Tomography-Based Muscle Measurements and Post-KT Outcomes.

Area of Science:

• Nephrology
• Transplantation
• Body Composition Analysis

Background:

• Early post-kidney transplant (KT) changes in body composition can lead to adverse outcomes.
• Understanding muscle quantity and quality changes after KT is crucial for patient management.

Purpose of the Study:

• To estimate post-KT trajectories of muscle quantity and quality using CT scans.
• To determine if these muscle changes are associated with mortality and graft loss in frail and nonfrail recipients.

Main Methods:

• Utilized CT scans from 294 adult KT recipients to measure muscle quantity (skeletal muscle index) and quality (skeletal muscle radiation attenuation).
• Employed mixed linear regression and Cox proportional hazard models to analyze 3-year muscle trajectories and their association with outcomes.

Main Results:

• Muscle quantity and quality decreased significantly in the first two years post-KT, then stabilized.
• Muscle changes differed based on frailty and lower extremity impairment.
• Lower muscle quantity was linked to higher mortality in frail recipients and increased graft loss in older recipients.
• Reduced muscle quality was associated with elevated risks of both mortality and graft loss.

Conclusions:

• Pre- and post-KT muscle quantity and quality are significant predictors of adverse outcomes.
• Rehabilitation interventions aimed at improving muscle mass and quality may reduce post-KT risks.