Which of the following is the most appropriate route of routine administration for insulin?

AIIMS Bhopal NO - 2018 (Shift-1st)

Pharmacology

Easy

Appeared in: AIIMS Bhopal NO - 2018 (Shift-1st)

Explanation

The subcutaneous route involves injecting insulin into the fatty tissue just under the skin, as shown in the image.
This method allows for slow, sustained absorption of the hormone, which mimics the body's natural basal insulin release and helps maintain stable blood glucose levels.
Common sites for subcutaneous injection include the abdomen, upper arms, thighs, and buttocks.
The abdomen provides the quickest and most consistent absorption, making it a preferred site for many patients.

Option A: This route provides immediate, rapid action and is not suitable for routine, daily management due to the high risk of causing sudden, severe hypoglycemia.
Option B: Absorption from muscle tissue is faster and more unpredictable than from subcutaneous tissue, which can lead to unstable blood glucose levels and an increased risk of hypoglycemia. This route is also more painful.
Option D: This route involves injecting into the dermis and has a very slow, minimal absorption rate, making it ineffective for delivering insulin for glucose control.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Routes of medication administration, specifically for insulin as background academic context rather than a clinical decision trigger.
A key nursing responsibility is educating patients on rotating injection sites to prevent lipodystrophy (atrophy or hypertrophy of subcutaneous fat), which can impair insulin absorption and lead to poor glycemic control.
What if? If a patient with type 1 diabetes presents to the emergency room with confusion, fruity-smelling breath, and a blood glucose of 550 mg/dL, the priority route changes. In this case of diabetic ketoacidosis (DKA), insulin would be administered intravenously (IV) for rapid correction.

How to Approach the Question

First, identify the key terms in the question: 'routine administration' and 'insulin'.
The word 'routine' is crucial; it asks for the standard, daily method, not an emergency or special-case route.
Recall the different parenteral routes: Intravenous (IV), Intramuscular (IM), Subcutaneous (SC), and Intradermal (ID).
Consider the purpose of routine insulin: to provide a steady level of glucose control. This requires slow, predictable absorption.
Evaluate the options based on absorption speed: IV is fastest (for emergencies), IM is fast and unpredictable, SC is slow and steady, and ID is very slow (for testing).
Conclude that the subcutaneous route is the only one that meets the requirement for slow, sustained absorption for routine management.

Concept Tested & Keywords

Concept Tested: Routes of medication administration, specifically for insulin.
Stem keywords: insulin, routine administration, route
Lead-in keywords: most appropriate
Clinical cues: The keyword 'routine' is critical, as it distinguishes daily management from emergency situations.
Negative lead-in flag: false

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E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 173-175

E6 Pharmacology Nursing Lilley 11e Part 1 p. 39-41