Neonatal Nonketotic Hyperglycinemia: A Case Study and Review of Management for the Advanced Practice Nurse

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Nonketotic hyperglycinemia (NKH) is an autosomal recessive inborn error of glycine metabolism. In this article, I will present the case of baby girl S. who presented to the emergency room on Day 4 of life with severe lethargy, seizures, and respiratory depression requiring mechanical ventilation. A diagnosis of NKH was made secondary to elevated plasma and cerebrospinal fluid glycine concentrations. I will review the pathophysiology of NKH, methods of diagnosis, and the differential diagnosis. There are a variety of different pharmacologic and alternative therapies for NKH. Despite these treatments, the prognosis for infants with NKH is poor, with severe neurologic impairment, intractable seizures, and death common before 5 years of age. I will address the role of the advanced practice nurse in caring for an infant with NKH including clinical, educational, and research implications.

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