Impaired kidney function and atrial fibrillation in elderly subjects

Area of Science:

• Cardiology
• Nephrology
• Geriatrics

Background:

• Cardiovascular events are more common in individuals with impaired kidney function.
• The association between kidney function and atrial fibrillation (AF) risk in the elderly population requires further investigation.

Purpose of the Study:

• To evaluate the association between kidney function and the risk of prevalent and incident atrial fibrillation (AF) in elderly individuals.

Main Methods:

• The study analyzed data from 4663 participants in the Cardiovascular Health Study (CHS).
• Kidney function was assessed using cystatin C and creatinine-based estimated glomerular filtration rate (eGFR).
• Prevalent AF was defined at baseline, and incident AF was tracked over a mean follow-up of 7.4 years.

Main Results:

• Higher cystatin C levels were significantly associated with a higher prevalence of AF, even after multivariate adjustment.
• Unadjusted analyses showed increased risk for incident AF with higher cystatin C levels, but this was not significant after adjustment.
• Reduced eGFR (<60 mL/min/1.73m²) was linked to prevalent and incident AF in unadjusted analyses, but not after multivariate adjustment.

Conclusions:

• Impaired kidney function, indicated by cystatin C levels, is an independent marker for prevalent atrial fibrillation in the elderly.
• Neither cystatin C nor eGFR were found to be significant predictors of incident atrial fibrillation in this cohort.