Homoarginine, kidney function and cardiovascular mortality risk.

Area of Science:

• Cardiovascular Medicine
• Nephrology
• Biomarker Discovery

Background:

• Homoarginine is an emerging biomarker for cardiovascular diseases.
• Kidney function is a critical factor in cardiovascular health.
• The interplay between homoarginine and kidney function in predicting cardiovascular outcomes requires further investigation.

Purpose of the Study:

• To investigate the association between serum homoarginine levels and kidney function.
• To examine the combined predictive value of homoarginine and kidney function for cardiovascular mortality.
• To explore potential interactions between homoarginine and kidney function in cardiovascular risk stratification.

Main Methods:

• A large cohort study of 3037 patients referred for coronary angiography.
• Measurement of serum homoarginine, cystatin C, and creatinine-based estimated glomerular filtration rate (eGFR).
• Multivariate Cox proportional hazard analysis and subgroup analyses to assess cardiovascular mortality risk.

Main Results:

• Serum homoarginine was positively associated with eGFR, indicating a link between higher homoarginine and better kidney function.
• Low homoarginine levels were independently associated with increased cardiovascular mortality.
• A significant synergistic interaction was observed between homoarginine and eGFR in predicting cardiovascular death, particularly in patients with eGFR < 60 mL/min per 1.73 m(2).
• Homoarginine was specifically linked to heart failure mortality in individuals with impaired kidney function.

Conclusions:

• Low serum homoarginine is strongly associated with decreased kidney function and adverse cardiovascular events, including death from heart failure.
• The predictive value of homoarginine for cardiovascular outcomes is significantly amplified in the presence of impaired kidney function.
• Homoarginine may serve as a valuable biomarker for risk stratification in patients with compromised renal function.