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Hypoglycemia pathogenesis in children with dumping syndrome
1Pediatric Endocrine Unit, Massachusetts General Hospital, Boston 02114.
Insights
Childhood dumping syndrome can cause severe hypoglycemia due to hormonal imbalances. This study reveals significant disturbances in the insulin-glucagon axis, leading to dangerous blood sugar swings in affected children.
Area of Science:
- Pediatric Endocrinology
- Gastroenterology
- Metabolic Disorders
Background:
- Dumping syndrome, a complication following gastric surgery or feeding tube placement, can lead to severe hypoglycemia in children.
- Understanding the precise mechanisms of hypoglycemia in pediatric dumping syndrome is crucial for effective management.
Observation:
- Three children experiencing severe hypoglycemic reactions secondary to dumping syndrome were analyzed.
- Blood glucose levels showed dramatic postprandial spikes followed by profound drops, proportional to meal volume.
- Hormonal analysis during meal challenges revealed abnormal insulin and glucagon dynamics.
Findings:
- Inappropriate early glucagon release was observed in one patient.
- Exuberant early insulin release led to rapid glucose decline in all patients.
- Hypoglycemia persisted even after insulin levels became undetectable, with an inadequate glucagon response.
Implications:
- Childhood dumping syndrome is associated with significant dysregulation of the insulin-glucagon axis.
- These hormonal disturbances contribute to the severe hypoglycemic episodes observed.
- Further research into managing these axis disturbances is warranted for improved patient outcomes.
Abstract:
Three children with severe hypoglycemic reactions secondary to dumping syndrome were studied to discern the mechanism by which hypoglycemia occurred. Symptoms in patient 1 developed after fundoplication, generalized autonomic dysfunction occurred in patient 2, and dumping syndrome developed in patient 3 after malplacement of a feeding gastrostomy tube. Average blood glucose levels studied during and after two to seven meals in each child were 375 +/- 97 mg/dL (mean +/- SD) 30 minutes postprandially and 35 +/- 10 mg/dL greater than 120 minutes later. Swings in glucose values were proportional to the volume of meals. Insulin and glucagon levels were followed during a single meal challenge test in each patient; the average glucose concentration increased to 356 +/- 59 mg/dL 30 minutes postprandially and decreased to 32 +/- 11 mg/dL at 150 +/- 30 minutes. Hormonal analyses indicated (1) inappropriate early release of glucagon (300 pg/mL at 15 minutes) in patient 1, (2) exuberant early release of insulin (maximum 190 +/- 15 microU/mL) resulting in rapid decrease in glucose concentration in all patients, (3) development and/or persistence of hypoglycemia after the decline in circulating insulin to undetectable levels, and (4) inadequate glucagon response to hypoglycemia resulting in sustained hypoglycemia. These data indicate that gross disturbances of the insulin-glucagon axis attend childhood dumping syndrome.