UC Davis

Introduction

Retrospective studies have shown conflicting benefit of utilizing targeted temperature management (TTM) in cardiac arrest (CA) patients with a non-shockable rhythm and presently there is only one randomized trial in this realm. We sought to determine trends and outcomes of TTM utilization in these patients from a large nationally representative United States population database.

Methods and results

Data were derived from National Inpatient Sample (NIS) from January 2006 to December 2013. All patients were identified using the International Classification of Diseases, 9th Revision, Clinical Modification (ICD-9-CM) codes. Patients with evidence of shockable rhythm (ventricular tachycardia, ventricular flutter and ventricular fibrillation) were excluded. Trends in TTM utilization and mortality were assessed over our study period. Various outcomes were measured in patients receiving TTM and no TTM in unmatched and propensity matched cohorts. Logistic regression analysis was done to determine predictors of mortality. A total of 1,185,479 CA patients were identified in whom cause of arrest was a non-shockable rhythm. Overall, there was a steady increase in TTM utilization over our study period. In propensity-matched groups, mortality was higher in patients in whom TTM was utilized compared to non-TTM group (72.9% vs 68.7%, P < .01). In adjusted analysis, TTM remains an independent predictor of increased mortality in our group. Mortality remained high with TTM utilization regardless of location of CA.

Conclusions

TTM utilization was associated with increased mortality in CA patients with a non-shockable rhythm. These findings merit further confirmation in a large randomized trial before application into clinical practice.