Outcomes in Children After Mild Neonatal Hypoxic Ischemic Encephalopathy: A Population-Based Cohort Study

( BJOG . 2023;130(13):1602–1609. doi: 10.1111/1471-0528.17533) The condition known as neonatal hypoxic ischemic encephalopathy (HIE) occurs when a term or near-term infant suffers asphyxiation during or near birth. The resulting signs and symptoms vary and may be classified as mild, moderate, or severe. Historically, infants diagnosed with mild HIE received alternative, and less intensive care given the understanding that outcomes were less severe compared with infants with the moderate or severe HIE diagnosis. However, recent studies have suggested young children (aged 2 to 5) who were diagnosed with mild HIE as infants are more likely to have a disability when compared with similar aged children without an HIE diagnosis. In addition, when examining mild HIE patients at neonatal discharge, abnormal results were found on amplitude-integrated electroencephalography, brain magnetic resonance imaging, and neurological exam. This population-based cohort study used register-based data to further understand how mild HIE relates to severe neurological outcomes, including death up to 6 years after birth.