Prognostic Impact of the Right-to-Left Atrial Volume Index Ratio on Mortality and Length of Stay in Patients Undergoing Coronary Artery Bypass Grafting

Background Atrial remodeling is a key mechanism influencing prognosis in cardiovascular diseases [1]. This study aimed to investigate the prognostic value of the right-to-left atrial volume index ratio (RAVI/LAVI) for 2-month all-cause mortality and length of hospital stay in patients undergoing coronary artery bypass grafting (CABG). Methods In this single-center retrospective observational study, a total of 267 hospitalized patients were included. Patients were stratified into two groups according to the median RAVI/LAVI ratio (below-median vs above-median). Clinical, laboratory, and echocardiographic variables were compared between groups. The primary endpoint was 2-month all-cause mortality after CABG, and the secondary endpoint was length of hospital stay. Predictors of mortality were evaluated using logistic regression analysis. Results Mortality was significantly higher in the high RAVI/LAVI group (35.2% vs 12.8%, p < 0.001), and the length of hospital stay was markedly longer (24.9 days vs 11.4 days, p < 0.001). In multivariable logistic regression analysis, the RAVI/LAVI ratio remained an independent predictor of mortality (OR 6.67; 95% CI 1.96–22.73; p = 0.002). Conclusion The RAVI/LAVI ratio demonstrates a strong and independent association with mortality and length of hospital stay. This ratio may represent a practical and robust echocardiographic marker for risk stratification in vascular and cardiac patients.