Improving the Timeliness and Safety of Therapeutic Hypothermia for Hypoxic-Ischemic Encephalopathy

Abstract

Introduction: Therapeutic hypothermia (TH) is a time-sensitive, efficacious treatment for newborns who experience perinatal hypoxic-ischemic encephalopathy. Optimal management of patient temperatures during TH may improve newborn outcomes and reduce side effects. We noted that patients undergoing TH were often outside of the target temperature range during treatment. This project sought to improve the timely initiation of effective treatment and temperature stability during TH through system-based changes in practice. Methods: Measures include the time to target temperature, the percentage of core temperatures outside of the target range, and the absolute difference between core and peripheral temperatures over 41 months. System-based changes in the TH protocol included changing from passive to active hypothermia on transport and utilizing a delivery mode that uses more gradual temperature fluctuations during TH. We compared measures of health status and side effects as balancing measures. Results: The TH protocol changes resulted in a significant reduction of time to goal temperature from 1.67 to 0.49 hours, in the percentage of temperature readings outside goal range from 12.6% to 6.3%, and the average absolute difference between core and peripheral temperatures from 1.78°C to 1.47°C. No adverse health outcomes were detected. We observed decreases in vasopressor use with each protocol change. Conclusions: This study demonstrates that detailed attention to the method of delivery of TH has an impact on ensuring effective delivery of therapy and minimizing the risks of treatment. The protocol changes were not associated with an increase in adverse events and were associated with a reduction in vasopressor use.