Abstract 147: Is Effect Size of Targeted Temperature Management Different for Pediatric Post-Cardiac Arrest Syndrome According to the Severity?

Abstract

Introduction: The beneficial effect of target temperature management (TTM) for pediatric post-cardiac arrest syndrome (PCAS) patients is controversial, and there are few studies on the differential effects of TTM according to the risk classification. Objective: The aim of this study was to evaluate the differential effects of TTM for pediatric PCAS patients according to a risk classification tool we previously developed, rCAST. Methods: We used data from the Japanese nationwide out-of-hospital cardiac arrest (OHCA) registry of the Japanese Association for Acute Medicine. We classified eligible pediatric PCAS patients (aged ≤18 years) who achieved return of spontaneous circulation (ROSC) according to the quintile of score points on the rCAST. The effect of TTM for their neurological outcome was evaluated for each severity group. And then, focusing on the severity group that appeared to benefit from TTM, we also evaluated the effect of TTM by the propensity score analysis with several adjustment factors. Good neurological outcome was defined as a Cerebral Performance Categories score or Pediatric Cerebral Performance Categories score ≤2 at 30 days. Results: Among 1,526 OHCA pediatric patients in the registry, data of 307 PCAS patients who achieved ROSC were analyzed. The proportion of patients with a good neurological outcome was higher among those who underwent TTM compared to those who did not in the first to forth quintile (TTM vs non-TTM; 81% [21/26] vs 58% [21/36] [p=0.10] in the first, 11% [2/19] vs 7% [2/31] [p=0.63] in the second, 12% [2/17] vs 0% [0/55] [p=0.053] in the third, and 11% [1/9] vs 0% [0/21] [p=0.30] in the fourth). In the group of the fifth quantile (rCAST ≥ 18.5), no patients showed good neurological outcome regardless of TTM (0% [0/20] vs 0% [0/73]). The propensity score analysis showed that TTM was significantly associated with their good neurological outcome in the patients classified into the first to fourth quantile group (Odds ratio; 1.21 [1.04-1.40], p = 0.014). Conclusions: TTM was significantly associated with a good neurological outcome in the pediatric PCAS patients with rCAST ≤ 18.0. All patients with rCAST ≥ 18.5 showed poor neurological outcomes even if they underwent TTM.