Beta-blocker (BB) intoxications are common in both childhood and adulthood. In the case of poisoning, bradycardia, hypotension, ventricular dysrhythmias, mental status changes, seizures, hypoglycemia, and bronchospasm may occur. Effects on the cardiovascular system are commonly seen, but hypoglycemia is not frequently observed in clinical practice. In this study, we aimed to answer the question, “Is hypoglycemia more commonly observed in BB intoxications than in other intoxications?”

This was a case–control study conducted in a pediatric emergency department of a university hospital. The case group (Group 1) consisted of cases with BB poisonings and the control group (Group 2) consisted of cases with selective serotonin receptor inhibitor (SSRI) poisonings. Data were obtained from patient files. We recorded the blood glucose levels (BGLs) of all patients on admission to the emergency department and at the 1-, 6-, and 24-h follow-up. The amounts of BBs received by the cases were compared with the specific toxic doses of each drug. The data obtained were analyzed using the Statistical Package for the Social Sciences 22 (SPSS.22) program. Mean and standard deviation for numerical values and frequency for categorical data are reported; at test, chi-square test, and ANOVA tests were used for the analysis.

The study comprised 40 patients (Group 1) and 40 controls (Group 2). The mean serum BGLs of patients in Group 1 at admission and at the 1-, 6-, and 24-h follow-up were 107.2 ± 46.3 mg/dl, 86.3 ± 20.1 mg/dl, 88.6 ± 28.4 mg/dl, and 86.5 ± 23.7 mg/dl, respectively. The mean values of Group 2 cases were 100 ± 39.5 mg/dl, 92.1 ± 30 mg/dl, 91±28 mg/dl, and 127.8 ± 60.7 mg/dl, respectively, at admission and at the 1-, 6-, and 24-h follow-up (p = 0.4, p < 0.001, p = 0.7, and p < 0.001, respectively). The mean BGLs of patients who were exposed to propranolol at admission and at the 1-, 6-, and 24-h follow-up were significantly lower than those of the patients who had taken different BBs in Group 1. No linear correlation was found between the percentage of exposure to BB toxic doses and BGLs.

Our study showed that the BGLs of patients receiving BBs could be lower, but they were not at a level that would have serious consequences. Nevertheless, the BGLs of all cases of intoxication should be monitored closely.