# Predictors of Long-Term Prognosis Focused on Kidney Function in Patients with Chronic Coronary Syndrome

## TL;DR

This study identifies kidney function and other factors that predict long-term survival in patients with chronic coronary syndrome.

## Contribution

The study highlights the importance of combining eGFR, albuminuria, and biomarkers like hsCRP to assess mortality risk in CCS patients.

## Key findings

- Patients with preserved eGFR and no albuminuria had the longest survival.
- Higher diastolic blood pressure and lower hsCRP were associated with better long-term outcomes.
- Hemoglobin concentration and LVEF were the strongest predictors of survival in regression analysis.

## Abstract

Background: The number of patients with chronic coronary syndromes (CCS) is growing, influenced by factors such as increasing life expectancy and prevalence of risk factors. Thus, cardiovascular (CV) disease remains the leading cause of mortality and morbidity worldwide. The main objective of the study was to identify factors associated with long-term survival in patients with chronic coronary syndrome, with a focus on kidney function described by eGFR and albuminuria (assessed by uACR). Methods: The study comprised a total of 257 patients from Bialystok (Poland), aged ≤ 80 years, who 6–18 months earlier were hospitalized for acute coronary syndrome or elective myocardial revascularization. During the 80-month follow-up, 40 (15.6%) patients died, while there was no information about three (1.2%) patients. Patients with preserved eGFR and without albuminuria were characterized by the longest survival, with deterioration of prognosis in groups of progressive kidney dysfunction as defined by KDIGO based on eGFR and uACR. The primary endpoint was death from any cause. Results: Those who survived the 80-month follow-up period were younger (p < 0.001), had a lower waist circumference (p = 0.028), higher diastolic blood pressure (p = 0.026), lower NTproBNP (p < 0.001) and hsCRP (p = 0.001) concentrations, reduced eGFR (p = 0.004) and increased ACR (p = 0.023) were strongly associated with mortality. In logistic regression analysis with stepwise elimination of variables, the strongest factors affecting survival were hemoglobin concentration, left ventricle ejection fraction (LVEF) and hsCRP. Conclusions: Measurement of albuminuria, in addition to eGFR, allows patients to be correctly classified into CV risk categories and facilitates appropriate treatment of patients with CCS. Higher diastolic blood pressure (but still within normal range) was found in patients who later survived 6 years. Measurements of hsCRP, hemoglobin concentration and LVEF help to identify CCS patients at the highest risk of mortality in long-term follow-up.