Abstract 271: Care Patterns for Out Of Hospital Cardiac Arrest Differ From Other Emergency Care Sensitive Conditions
Background: Understanding utilization patterns for out of hospital cardiac arrest (OHCA) is critical to organizing regional systems of care as recommended by the American Heart Association. We examined the agreement between regional utilization patterns for out-of-hospital cardiac arrest (OHCA) and other emergency care sensitive conditions (ECSCs). Methods: We used Medicare fee-for-service outpatient and inpatient claims from 2013-2014 to describe geographic utilization patterns for 5 emergency care conditions as has been done previously. We compared these regional clusters developed for OHCA to similarly created clusters for other emergency cardiovascular (ECV) conditions (by adding STEMI and stroke). Regional ZIP code attributions were compared using a modified Jaccard index, measuring the agreement between region membership. We also calculated patient-level risk-adjusted survival probabilities (controlling for patient age, sex, race and presenting condition) and summarized for each region as an observed-to-expected (O:E) ratio. O:E ratios higher than 1 indicate better than expected survival. Each region was ranked based on its O:E ratio and ranks between the two sets of conditions were compared. Results: The analysis included 3,279,013 ECSC claims containing 246,342 OHCA and 1,037,472 ECV claims grouped into 234 OHCA regions and 343 ECV regions. When comparing OHCA only to all ECV utilization (clusters), agreement was 64%. O:E survival to hospital discharge for OHCA regions showed greater variability compared to ECV regions (OHCA: 0.53-2.2 vs. ECV: 0.90 - 1.10). In comparing ranked O:E outcomes between OHCA and ECV regions, we found 72% discordance in quartile rankings (κ = 0.28). Conclusion: Care utilization pattern and risk-adjusted survival for OHCA in older adults vary greatly when compared to other emergency cardiovascular conditions and should be benchmarked separately. Further research is needed to understand the role strong regionalization of care policies could play in improving outcomes and streamlining care processes.