3 learning resources available for this topic
Hypoglycemia is defined as abnormally low blood glucose levels, typically below 70 mg/dL (3.9 mmol/L), which can cause symptoms ranging from mild autonomic responses to severe neuroglycopenic effects. It commonly occurs in diabetic patients due to medication effects, but can also result from various non-diabetic causes including insulinomas, adrenal insufficiency, or prolonged fasting.
When blood glucose drops below normal levels, the body initiates counterregulatory responses including epinephrine and glucagon release to stimulate hepatic glucose production and glycogenolysis. As glucose continues to decline, the brain becomes glucose-deprived since it cannot utilize alternative fuel sources efficiently, leading to neuroglycopenic symptoms and potential neuronal damage if prolonged.
Initial evaluation focuses on confirming hypoglycemia through blood glucose measurement while assessing for underlying causes such as medication timing, food intake, or systemic illness. The Whipple triad (symptoms of hypoglycemia, documented low glucose, and symptom resolution with glucose administration) helps establish the diagnosis, while further workup may include insulin and C-peptide levels to differentiate exogenous from endogenous causes.