Objective
To establish the evidence of therapeutic hypothermia for newborns with hypoxic ischemic encephalopathy (HIE).
Data Sources
Cochrane Central Register of Controlled Trials, Oxford Database of Perinatal Trials, MEDLINE, EMBASE, and previous reviews.
Study Selection
Randomized controlled trials that compared therapeutic hypothermia to normothermia for newborns with HIE.
Intervention
Therapeutic hypothermia.
Main Outcome Measures
Death or major neurodevelopmental disability at 18 months.
Results
Seven trials including 1214 newborns were identified. Therapeutic hypothermia resulted in a reduction in the risk of death or major neurodevelopmental disability (risk ratio [RR], 0.76; 95% CI, 0.69-0.84) and increase in the rate of survival with normal neurological function (1.63; 1.36-1.95) at age 18 months. Hypothermia reduced the risk of death or major neurodevelopmental disability at age 18 months in newborns with moderate HIE (RR, 0.67; 95% CI, 0.56-0.81) and in newborns with severe HIE (0.83; 0.74-0.92). Both total body cooling and selective head cooling resulted in reduction in the risk of death or major neurodevelopmental disability (RR, 0.75; 95% CI, 0.66-0.85 and 0.77; 0.65-0.93, respectively).
Conclusion
Hypothermia improves survival and neurodevelopment in newborns with moderate to severe HIE. Total body cooling and selective head cooling are effective methods in treating newborns with HIE. Clinicians should consider offering therapeutic hypothermia as part of routine clinical care to these newborns.