The Association of Low Blood Glucose and Low Serum Cortisol Levels in Severely Ill Children Admitted to Tertiary Referral Hospitals in Malawi: A Case-Control Study

Low blood glucose concentrations < 5 mmol/L in severely ill children presenting to hospitals in low-income countries are associated with mortality. Adrenal insufficiency with low cortisol levels may contribute to low blood glucose concentrations. Understanding the association between low cortisol and low blood glucose may assist in improving guidelines for management of severely ill children. The study aimed to determine the association between low serum cortisol and low blood glucose in severely ill children. A matched case-control study of children aged 1 month to 15 years was conducted at two tertiary hospitals in Malawi. Cases were children with blood glucose < 5 mmol/L. Two age-matched controls with blood glucose of ≥ 5–15 mmol/L were enrolled per case. Low cortisol was defined as serum cortisol of < 25 µg/dL (690 nmol/L) and adrenal insufficiency as serum cortisol of < 10 µg/dL (276 nmol/L). A total of 54 cases and 108 controls were enrolled with, median age of 2.8 years (interquartile range [IQR]: 1.7–4.4). The median cortisol level was 58.7 µg/dL (IQR: 42.3–61.8) in cases and 40.9 µg/dL (IQR: 33.7–51.2) in controls (P = 0.911). The proportion of low cortisol was 4/54 (7.4%) in cases and 9/108 (8.3%) in controls. Logistic regression shows no association between low cortisol and low blood glucose (adjusted odds ratio: 0.33; 95% confidence interval, 0.04–3.02). Results suggest that there is no association between low cortisol and low blood glucose among severely ill children presenting to hospitals in Malawi. The reason for low blood glucose needs further investigation.