Incidence of hypoglycemia in newborn infants identified as at risk

Background: Temporary low plasma glucose concentrations are common in healthy newborns. Although there is no uniform definition of neonatal hypoglycemia, there is a consensus in the current literature that plasma glucose concentrations should be measured in infants at risk. Known risk groups for transient neonatal hypoglycemia include infants of diabetic mothers (IDM), large (LGA) or small (SGA) for gestational age and late preterm (LPT) infants.Objectives: The aim of this retrospective trial was to determine the incidence of hypoglycemia and the impact of the application of a 2011 revised guideline in respect of additional feeding or i.v. glucose administration, admission to a neonatal ward and the number of blood samples taken.Methods: During the period 1 January 2015 to 31 January 2016, the plasma glucose concentrations of all infants at risk were determined. They were screened over a period of 24 hours or until plasma glucose concentration was >45 mg/dL on three occasions. Hypoglycemia was defined as a plasma glucose concentration <40 mg/dL, regardless of the age of the infant.Results: One hundred and thirty-six (13.6%) out of 1017 newborns were identified as at-risk patients, 119 (87.5%) of whom were included in the final data evaluation. Ten study participants had more than one risk factor and 32 (26.9%) newborns (male:female = 1.1:1) had a total of 40 hypoglycemic episodes. Three (9.4%) out of these 32 newborns had to be transferred to the neonatal ward for i.v. glucose treatment. The mean number of blood samples taken was 7.6 ± 2.4.Conclusions: The incidence of hypoglycemia in the studied infants at risk was 27%, and 19.7 blood samples had to be taken to detect one episode of low glucose concentration. Neonatal hypoglycemia can be recognized and avoided in time, which justifies the establishment of a standardized plasma glucose measurement protocol in newborn infants at risk.Brief RationaleFollowing a considerable number of sources, it is recommended that infants at risk be identified, low plasma glucose concentrations prevented and, if necessary, the affected neonates cared for. Our data show that the risk group for neonatal hypoglycemia comprised about one-tenth of all infants at our nursery and hypoglycemia occurred in one-fourth. These results are in accordance with the recommendations to implement this protocol as a screening tool in neonates.