Which of the following medication requires monitoring of blood glucose level which may cause glycogenolysis and insulin resistance?

1. A

   Propranolol

2. B

   Dobutamine

3. C

   Adrenaline

4. D

   Noradrenaline

Appeared in: NORCET 5 mains

Explanation

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• Adrenaline, also known as epinephrine, is a potent sympathomimetic amine that acts on both alpha and beta-adrenergic receptors.
• Its strong stimulation of β2-receptors in the liver and skeletal muscle leads to significant glycogenolysis (the breakdown of stored glycogen into glucose).
• Adrenaline also promotes gluconeogenesis (the creation of new glucose) and induces a state of insulin resistance, where the body's cells do not respond effectively to insulin.
• The combination of these effects results in a rapid and significant increase in blood glucose levels, necessitating close monitoring.

Why Other Options Were Wrong

• Option A: Propranolol is a non-selective beta-blocker. By blocking β2 receptors, it inhibits glycogenolysis. This action does not raise blood glucose; instead, it can cause hypoglycemia or delay recovery from it.
• Option B: Dobutamine is a selective β1-adrenergic agonist. Its primary action is to increase cardiac contractility and output. It has minimal effect on β2 receptors and therefore does not significantly impact blood glucose metabolism.
• Option D: Noradrenaline acts primarily on α1 and β1 receptors, with much weaker activity at β2 receptors compared to adrenaline. While it can cause a mild increase in blood glucose, its effect is not as potent or significant as that of adrenaline.

Related Visual

• Visual 1: Diagram showing the adrenergic receptors (α1, β1, β2) on different organs (liver, muscle, heart) and illustrating how Adrenaline's potent β2 stimulation on the liver leads to glucose release.
• Visual 2: Flowchart demonstrating the metabolic pathway from adrenaline stimulation → activation of adenylyl cyclase → increased cAMP → activation of protein kinase A → glycogenolysis → increased blood glucose.

Clinical Relevance

• Nursing practice connection: Knowing Pharmacological effects of adrenergic drugs on glucose metabolism helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Nurses must be vigilant in monitoring blood glucose levels in any patient receiving an adrenaline infusion, as hyperglycemia can worsen outcomes, especially in critically ill patients or those with sepsis or head injury.
• In patients with known diabetes, insulin doses often need to be adjusted (typically increased) when adrenaline is administered to prevent severe hyperglycemia.
• It is a critical nursing responsibility to have a protocol for glucose monitoring and management for patients on vasopressors like adrenaline.

How to Approach the Question

• First, identify the key physiological processes in the question: 'glycogenolysis' and 'insulin resistance'. Both of these mechanisms lead to an increase in blood glucose.
• The question asks which medication causes these effects, requiring recall of the pharmacology of adrenergic drugs.
• Think about the different adrenergic receptors and their main functions: α1 (vasoconstriction), β1 (increased heart rate/contractility), and β2 (bronchodilation, vasodilation, and glycogenolysis).
• Evaluate each option based on its receptor selectivity:
• Propranolol is a beta-blocker, so it would inhibit, not cause, these effects.
• Dobutamine is a β1-agonist, primarily affecting the heart, not glucose metabolism.

Concept Tested & Keywords

• Concept Tested: Pharmacological effects of adrenergic drugs on glucose metabolism
• Stem keywords: medication, monitoring, blood glucose level, glycogenolysis, insulin resistance
• Lead-in keywords: Which
• Negative lead-in flag: false

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