Abstract 337: Trends and Outcomes with Early Left Heart Catheterization in Post-Out-of-hospital Cardiac Arrest

Background: Left heart catheterization (LHC) and TTM are proven beneficial after OHCA. Detroit CARES data found a strong, though insignificant, trend for LHC rate and survival (p = 0.1). In 2018, the rate of patients with LHC and good CPC nearly doubled, despite an overall decrease in LHC rate. Therefore, we hypothesize LHC is performed later (after second day of hospitalization) nationwide and a good CPC is likely associated with selection of patients expected to survive. Methods: We analyzed the national CARES registry (2013 - 2018) to investigate whether delayed LHC after OHCA was occurring nationally. Included were patients 18 or older, non-skilled care facility patients and surviving to admission. The primary outcome was the CPC dichotomized into good (1 or 2) and poor (3 - 5). A propensity score was derived to predict early LHC that incorporated factors associated with LHC and outcome. A multi-level logistic regression analyses was fit using inverse weighted propensity scores. The primary predictor of interest was early LHC relative to no or late LHC. Also examined were TTM, year of cardiac arrest, and other predictors. Results reported are odds ratios (OR) and the corresponding 95% confidence intervals (95% CI). Results: 62,195 individual cases were identified; the median age was 61, (IQR-16), 62% male, 32% unwitnessed, 37% bystander CPR, and 35% initial shockable rhythm. 29% had good outcome and 22% received early LHC, 6% late LHC and 72% no LHC. 13% of patients receiving early LHC and 23% with no or late LHC had a good outcome. OR and 95% CI for good outcome were: 2.4 (2.2-2.7) for early LHC, 3.6 (3.3-3.8) for shockable rhythm, 1.9 (1.7-2.0) for public location and 2.0 (1.8-2.2) for witnessed arrest. Over the five-year period, no change in the total LHC occurred and a slight decrease in early LHC, (25%-23%), (Fig 1). Conclusion: Early LHC was associated with good outcome (CPC) at hospital discharge. The overall LHC rate is unchanged from 2013-18 with a slight decrease in early LHC.