The preferred site for IM injection in infants is?

DSSSB Public Health Nurse - 2015

Child Health Nursing (Pediatrics)

Easy

Appeared in: DSSSB Public Health Nurse - 2015

Explanation

The vastus lateralis muscle is the preferred and safest site for IM injections in infants (birth to 12 months).
This site is chosen because the muscle is large and well-developed at birth, allowing it to accommodate the injected medication.
Crucially, it is free from major nerves (like the sciatic nerve) and blood vessels, significantly reducing the risk of injury during injection.
The maximum volume that can be safely injected into this site in an infant is typically 0.5 mL to 1 mL.

Option A: The dorsogluteal muscle is underdeveloped in infants and is located dangerously close to the sciatic nerve. An injection here carries a high risk of causing permanent nerve damage and paralysis.
Option C: While located on the thigh, injections into the rectus femoris muscle are associated with more pain and discomfort compared to the vastus lateralis.
Option D: This is a very safe site, but in infants, the muscle is not as developed as the vastus lateralis. Its use is not recommended until a child has been walking for at least a year, which helps develop the gluteal muscles.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Intramuscular (IM) Injection Sites in Infants as background academic context rather than a clinical decision trigger.
Correct site selection is a critical nursing responsibility to ensure medication is absorbed effectively and to prevent serious complications like nerve damage, pain, or abscess formation.
A nurse must always assess the infant's muscle mass and choose the appropriate needle length (typically 16-25 mm or 5/8 to 1 inch) to ensure the medication reaches the muscle tissue without hitting the bone.
What if the injection volume is greater than 1 mL for an infant? The nurse should split the dose and administer it in two separate injections, preferably in two different sites (e.g., both vastus lateralis muscles), to avoid overwhelming the muscle tissue and causing discomfort.

How to Approach the Question

First, identify the key elements of the question: the procedure (IM injection) and the patient population (infants).
Recall the developmental anatomy of an infant. Infants have underdeveloped gluteal muscles and are not yet walking.
Consider the safety profile of each potential injection site. The primary concern is avoiding major nerves and blood vessels.
Evaluate the options based on safety and muscle development. The dorsogluteal site is immediately ruled out due to the high risk of sciatic nerve injury.
The ventrogluteal site is not ideal as the muscle is less developed in non-walking infants.
Compare the thigh muscles. The vastus lateralis is the largest and safest muscle for IM injections in this age group, making it the definitive correct answer.

Concept Tested & Keywords

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