Abstract 15977: Utilizing Admission Bloodwork to Risk Stratify for Acute Kidney Injury in Hospitalized Patients With NSTEMI or Unstable Angina Undergoing Invasive Coronary Angiography± PCI

Introduction: AKI after invasive coronary angiography (CAG) or PCI is common with an estimated incidence of 7-9%. This complication incurs approximately a $9,500 higher cost of stay, with proportional length of stay increases with absolute elevations in serum creatinine (sCr). While the majority of adverse events occur within 30 days of procedure, there is evidence of increased mortality, stroke, and MACE at 1 year and 5 years following index AKI. This study aimed to identify risk factors for AKI in hospitalized NSTEMI and unstable angina undergoing CAG ± PCI.

Methods: Patients who were admitted for NSTEMI or UA who underwent CAG from 2011-2022 in Northeast Ohio Cleveland Clinic hospitals were identified from the EMR. Admission and serial blood work results in addition to demographics, past medical history, and hospital course were compiled and analyzed via multivariable logistic regression using R statistical software. KIDAGO definitions of AKI were utilized to define presence of AKI. All patients declared ESRD prior to admission were excluded from analysis.

Results: 4,174 cases were included in the analysis with mean age 66.5 years, 63% male, and 81% Caucasian. 7% developed AKI and there was no difference in the proportion of race, gender, or prevalence of ischemic heart disease between those who developed AKI and those who did not. Patients who developed AKI were older (70.9 vs. 66.1 years, p<0.001), and were more likely to have a history of CHF (22.2 vs 10.1%, p<0.0001), CKD (26.3 vs. 9.5%, p<0.001), CVA (22.5 vs 15.3%, p=0.001), and hypertension (66.6 vs 59.4%, p=0.016). Multivariable logistic regression was performed on admission blood work in the presence of known risk factors for AKI, Table 1.

Conclusions: In patients admitted with NSTEMI or UA who undergo CAG ± PCI, admission blood work helps identify patients at risk for AKI even in the presence of traditional risk factors such as IABP, age, and history of CKD.