Diabetic Emergencies: Hypoglycemia Notes on Hypoglycemia

Overview of Hypoglycemia

• Definition: An episode of abnormally low blood glucose posing a risk of harm; in people with diabetes mellitus, symptoms typically occur at levels less than $3.9\,mmol/L$.

• Prevalence:

  • $1$ in $2$ patients self-report at least one mild episode within a $12$-month period.

  • $1$ in $3$ patients with Type $1$ or Type $2$ diabetes experience a severe episode annually.

  • The condition is more frequent in Type $1$ diabetes due to universal insulin use.

Categorization of Symptoms

• Autonomic Symptoms: Result from excess catecholamine secretion (flight or fright response).

  • Includes: Anxiety, tremor, palpitations, sweating, and hunger.

• Neuroglycopenic Symptoms: Result from reduced glucose supply to the Central Nervous System (CNS).

  • Includes: Confusion, personality or behavior changes, weakness, drowsiness, seizures, coma, and potential death if untreated.

Questions & Discussion

• Question: Why is hyperglycemia problematic?

  • Options: (a) Neurocognitive decline and dementia in older persons; (b) Cardiovascular events; (c) Hospitalization due to delirium or loss of consciousness; (d) Loss of glucose control for fear of further hypoglycemia; (e) All of the above.

  • Response: The correct answer is All of the above. Hypoglycemia (noted contextually despite the speaker's use of "hyperglycemia" in the prompt) must be avoided to prevent these consequences.

• Question: Which of the following is a risk factor for hypoglycemia?

  • Options: (a) Not adherence to insulin therapy; (b) Sedentary lifestyle; (c) Steroid therapy; (d) Weight gain; (e) Inappropriate insulin dosing.

  • Response: The correct answer is Inappropriate insulin dosing. Options (a) through (d) are associated with hyperglycemia.

Causes and Physiological Mechanisms

• Medications:

  • Insulin: Excessive/inappropriate dosing, overly stringent targets, or incorrect administration.

  • Sulfonylureas: Stimulate endogenous pancreatic insulin secretion.

• Lifestyle Factors:

  • Nutrition: Reduced intake, fasting, or low-carbohydrate (keto) diets.

  • Exercise: Unplanned activity causes insulin-independent glucose uptake in skeletal muscles.

  • Alcohol: Excess consumption reduces hepatic glucose production.

• Intercurrent Illness:

  • Kidney/Liver Dysfunction: Prolongs the action of insulin.

  • Adrenal Insufficiency: Cortisol deficiency increases tissue sensitivity to insulin.

  • Severe Infection.

Management and Treatment Protocols

• Acute Management (Conscious Patient):

  1. Ingest $15$ to $20\,g$ of fast-acting carbohydrate (e.g., $4$ to $5$ jelly beans, $1/2$ cup of Coke or orange juice, or $1$ tablespoon of honey).

  2. Retest blood glucose in $15$ minutes; repeat treatment if levels remain low.

  3. Once euglycemic, ingest a slow-release carbohydrate (e.g., slice of bread or muffin) to prevent recurrence.

• Emergency Management (Unconscious Patient):

  • Requires intravenous ($IV$) glucose or intramuscular ($IM$) glucagon injection.

• Prevention and Long-term Care:

  • Reassess treatment targets and adjust medication doses.

  • Provide lifestyle counseling regarding regular meals and carbohydrate intake surrounding exercise.

  • Address underlying intercurrent conditions.