At what degree angle should a nurse insert the needle for an IM injection?

Appeared in: UP CHO - 2018

Explanation

Intramuscular (IM) injections are administered at a 90-degree angle to the skin.
This perpendicular angle ensures the needle passes through the epidermis, dermis, and subcutaneous fat to deposit medication into the deep muscle tissue.
Muscle tissue has a rich blood supply, which allows for rapid absorption of the medication.
Using a 90-degree angle is crucial for achieving the intended therapeutic effect and minimizing complications.

Option A: A 45-degree angle is used for subcutaneous (SC) injections, not intramuscular injections. This angle targets the fatty tissue just below the skin.
Option B: A 15-degree angle is used for intradermal (ID) injections. This very shallow angle places the medication just under the epidermis.
Option D: A 60-degree angle is not a standard angle for any of the common injection routes (IM, SC, ID). Using this angle would be an incorrect technique.

Clinical Relevance

Nursing practice connection: Knowing Parenteral Medication Administration helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Using the correct needle angle is a fundamental patient safety measure. An incorrect angle can lead to ineffective medication absorption, nerve or bone injury, and unnecessary pain.
For IM injections, failure to use a 90-degree angle may result in the medication being deposited into the subcutaneous fat, leading to slower absorption and potential local tissue damage or sterile abscess formation.
What if? If a nurse administers a viscous antibiotic intended for IM injection at a 45-degree angle in an average-sized adult, the medication will likely end up in the subcutaneous tissue. This will delay its absorption, potentially compromising its effectiveness, and could cause significant pain, irritation, and tissue damage at the injection site.

How to Approach the Question

Identify the key terms in the question: 'IM injection' and 'angle'.
This is a factual recall question based on a standard nursing procedure.
Recall the different types of parenteral injections and their corresponding angles.
Visualize the layers of tissue (skin, fat, muscle) and how the angle of insertion determines which layer the needle tip reaches.
Select the angle that specifically targets the muscle tissue, which is 90 degrees.
Mentally compare this with the angles for subcutaneous (45-90 degrees) and intradermal (15 degrees) to confirm your answer.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 174-176

E6 Pharmacology Nursing Lilley 11e Part 1 p. 132-134

E6 Nursing Fundamentals Taylor p. 862-864

Practise the full UP CHO - 2018

Attempt every question from this paper in a timed mock, then review the full solution for each one.