Intramuscular injection should be administered with an angle of?

AIIMS CRE SNO - 2023

Nursing Foundation

Easy

Appeared in: AIIMS CRE SNO - 2023

Explanation

Intramuscular (IM) injections are correctly administered at a 90-degree angle relative to the skin.
This perpendicular angle ensures the needle penetrates the epidermis, dermis, and subcutaneous tissue to deposit medication deep within the muscle mass.
Muscle tissue has a rich blood supply, which allows for faster absorption of the medication compared to other parenteral routes like subcutaneous injections.

Option B: A 45-degree angle is too shallow for an IM injection and would likely deposit the medication into the subcutaneous tissue instead of the muscle.
Option C: A 35-degree angle is not a standard angle for any common parenteral injection. It is too steep for an intradermal injection and too shallow for both subcutaneous and intramuscular injections.
Option D: A 60-degree angle is not the standard for an IM injection. While it falls within the range for some subcutaneous injections (45-90 degrees), it does not guarantee deep muscle penetration.

Visual 1: Diagram: A clear illustration comparing the angles of insertion for Intramuscular (90°), Subcutaneous (45°), and Intradermal (10-15°) injections. The diagram should show a cross-section of the skin layers (epidermis, dermis, subcutaneous tissue, and muscle) and how the needle penetrates to the correct depth for each type.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Parenteral Medication Administration Angles as background academic context rather than a clinical decision trigger.
Using the correct injection angle is a fundamental nursing skill critical for patient safety and medication efficacy. An incorrect angle can lead to complications such as injecting into the wrong tissue layer, causing pain, abscesses, nerve damage, or altered drug absorption rates.
The choice of needle length is as important as the angle. A needle that is too short may not reach the muscle in an obese patient, while a needle that is too long may hit bone in an emaciated patient.
What if? If a patient is very thin or cachectic, the nurse must still use a 90-degree angle for an IM injection but should pinch the muscle tissue to lift it from the bone and use a shorter needle to prevent injury.

How to Approach the Question

First, identify the key term in the question: 'Intramuscular injection'.
Second, recall the standard administration techniques for the different parenteral routes (Intramuscular, Subcutaneous, Intradermal).
Third, remember that intramuscular injections are intended to go deep into the muscle. Visualize the needle needing to be perpendicular to the skin to achieve this depth.
Fourth, associate the 90-degree angle with this perpendicular insertion.
Fifth, differentiate this from the other common angles: 45 degrees for subcutaneous and 10-15 degrees for intradermal.
Finally, select the option that matches the standard for IM injections.

Concept Tested & Keywords

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