Which is the preferred site for intramuscular injection in infants?

WCL Staff Nurse - 2019

Pediatric Nursing

Easy

Appeared in: WCL Staff Nurse - 2019

Explanation

The vastus lateralis muscle is the recommended site for intramuscular (IM) injections in infants.
This muscle is the largest and most developed in infants, providing a safe and ample area for medication administration.
It is located on the anterolateral (front-outer) aspect of the thigh, away from major nerves (like the sciatic nerve) and blood vessels, minimizing the risk of injury.
The maximum volume for an IM injection in this site for infants is typically 0.5 mL to 1 mL.

Option A: The deltoid muscle is small and underdeveloped in infants, which increases the risk of injuring the nearby radial and axillary nerves. It can only accommodate very small volumes (less than 2 mL) and is not the primary choice for this age group.
Option B: The rectus femoris muscle, located on the anterior thigh, can be used but is generally not recommended. Injections at this site are associated with more pain and discomfort for the infant, potentially affecting leg movement.
Option D: The ventrogluteal site is not the preferred site for infants because the muscle is not yet well-developed from walking, and the landmarks can be harder to identify correctly in this age group.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Intramuscular Injection Sites in Infants as background academic context rather than a clinical decision trigger.
Proper site selection is a critical nursing responsibility to ensure patient safety, prevent nerve or tissue damage, and ensure effective medication absorption.
Administering an injection in the wrong site can lead to complications such as pain, abscess formation, hematoma, and permanent nerve damage (e.g., sciatic nerve injury if the dorsogluteal site is incorrectly used).
What if? If an infant is emaciated or has very poor muscle mass, the nurse must grasp the muscle tissue firmly to ensure the medication is deposited into the muscle and not the subcutaneous layer. The needle length may also need to be adjusted.

How to Approach the Question

First, identify the core question: it asks for the 'preferred' IM injection site for a specific population, 'infants'.
Recall knowledge about pediatric medication administration. Remember that anatomical and physiological differences in infants (like muscle development) are key factors.
Evaluate each option based on infant anatomy. Consider the size of each muscle and its proximity to major nerves and blood vessels.
Eliminate the deltoid site because it's too small in infants.
Eliminate the ventrogluteal site as it's preferred for older children and adults who have more developed gluteal muscles from walking.
Compare the vastus lateralis and rectus femoris. Both are on the thigh, but the vastus lateralis (side of the thigh) is preferred over the rectus femoris (front of the thigh) because it is less painful.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 3 pp. 174-176, 175-177

E6 Nursing Fundamentals Taylor p. 861-863