How does clinical profile and outcome differ in patients with Chronic Kidney Disease undergoing percutaneous coronary revascularization according to the severity of CKD? – CHANNEL Study

Background: Chronic kidney disease (CKD) is an independent risk factor for the development of coronary artery disease. We evaluated outcomes amongst patients of CKD undergoing percutaneous coronary intervention (PCI) as assessed on severity of CKD based on estimated glomerular filtration rate (eGFR) at the time of PCI. Method and materials: We analyzed 100 consecutive CKD patients who underwent PCI and were followed up for 1 year; an observational, prospective, open-label study. Multivariate and Receiver operator characteristics (ROC) analysis was used to determine the cut point ofeGFR for predicting 4-P major adverse cardiac events (MACE) outcomes defined as the composite of Cardiovascular (CV) mortality, heart failure hospitalization (HHF), repeat revascularization and non-fatal MI over 1 year follow up. Results: According to eGFR cut-off value derived from ROC, patients were divided in to two groups based on eGFR cut-off of 36.25 mL/min/1.73 m2. Majority of patients (79%) were in Group 1 (eGFR >36.25 mL/min/1.73 m2). Group 2 had Lower HbA1C, hemoglobin and elevated level of urea as compared to group:1 (p=0.002,<0.0001 respectively). All-cause mortality had trend forbeing higher (6.3 vs. 19%) in group:2, but statistically non-significant (p = 0.17). Lower baseline LVEF (39 ± 10.08%) across the cohort was independent predictor of higher risk for HHF. eGFR <36.25 mL/mim/1.73 m2 was the most robust predictor of MACE, carrying a 3-fold increase in risk of 4-P MACE with significant association (0.69, CI 0.59 to 0.78, p = 0.0009). Conclusions: Lower baseline eGFR was associated with higher incidence of 4 P MACE with best cut-off being eGFR