Clinical Profile of Hypoglycaemia in Neonates at Risk in a Tertiary Care Teaching Institute in Southern India: A Longitudinal Study

Abstract

Introduction: Hypoglycaemia is common in babies at risk. Without early detection, timely diagnosis and treatment, hypoglycaemia can cause disastrous consequences on neurological and developmental outcomes. Therefore, continuous monitoring of blood glucose levels in babies at risk should be done to reduce its impact. Aim: To describe the clinical profile and sequential blood sugar levels in the first four postnatal days in at-risk neonates and to identify the risk group of neonates with recurrent hypoglycaemia. Materials and Methods: This was a longitudinal study done in the Neonatal Intensive Care Unit (NICU) and Special Newborn Care Unit (SNCU) of a tertiary care teaching institute; Sri Avittam Thirunal Hospital (SATH), Government Medical College, Thiruvananthapuram, Kerala, India, from October 2017 to October 2018. Neonates admitted with risk factors for hypoglycaemia according to ‘National Neonatology Forum’ clinical guidelines with low capillary blood sugar (<40 mg/dL) within the first two to four hours of life were included in the study. These neonates were followed up clinically till fourth post natal day with glucose monitoring. Statistical analysis was done using Statistical Package for the Social Sciences (SPSS) software version 22. Categorical variables were expressed as proportions and were compared using the Chi square test. A p-value <0.05 was considered statistically significant. Results: A total of 368 ‘at risk’neonates had hypoglycaemia at admission (2 to 4 hours) and of these 200 (54.3%) developed recurrent hypoglycaemia. Out of the neonates with recurrent hypoglycaemia, 150 (75%) were preterm and 50 (25%) were term. The preterm Small for Gestational Age (SGA) had a higher chance of developing recurrent hypoglycaemia than preterm Appropriate for Gestational Age (AGA) and Large for Gestational Age (LGA) (p-value 0.0256). Although, 102 (40.2%) preterm had asymptomatic hypoglycaemia, 90 (78.9%) term neonates showed symptoms of hypoglycaemia. The major clinical manifestation was jitteriness in those with a single episode 31 (18.45%) and lethargy/poor activity in those with more than one episode 66 (33%). The blood glucose levels less than 25 mg/dL at admission was significantly associated with the occurrence of a repeat episode of hypoglycaemia (p-value-0.028). Conclusion: Blood glucose monitoring in neonates with risk factors is mandatory as 54.3% of neonates developed recurrent hypoglycaemia. Of these, preterm SGA had a high chance of developing recurrent hypoglycaemia. The variable presentations in neonatal hypoglycaemia indicates the need for detailed and thorough clinical examination with glucose monitoring in these at-risk neonates. Initial blood glucose level less than 25 mg/dL was significantly associated with recurrent hypoglycaemia.

Keywords

• blood sugar
• brain injury
• glucose monitoring
• lethargy
• low birth weight
• newborn babies
• preterm