The difference between cystatin C- and creatinine-based estimated glomerular filtration rate and survival in amyotrophic lateral sclerosis: a population-based cohort study.

OBJECTIVES

We investigated the relationship between cystatin C- and creatinine-based estimated glomerular filtration rate (eGFRdiff) and amyotrophic lateral sclerosis (ALS) outcomes.

METHODS

We enrolled ALS patients diagnosed between January 2014 and December 2019. Experienced neurologists followed up the participants until January 2022. Absolute difference between eGFR (eGFRabdiff) and relative difference between eGFR (eGFRrediff) were obtained. Cox proportional hazard models were used to evaluate the relationship between eGFRdiff and ALS survival.

RESULTS

Negative eGFRabdiff were common in the patients (74.7%). For each SD increase of eGFRabdiff, the risk of poor prognosis for ALS patients decreased by 1.9% (HR, 0.981; 95% CI, 0.973-0.989). For each 10% increment in eGFRrediff, the risk of poor prognosis for ALS patients decreased by 17.7% (HR, 0.823; 95% CI, 754-0.898).

CONCLUSIONS

We found that large eGFRdiff was associated with poor prognosis in ALS. Monitoring eGFRdiff in ALS population facilitates prognostic stratification assessment and precise management.