Which one is the preferred site for intramuscular injection in under five-year-old children?

UPPSC-2021

Child Health Nursing (Pediatrics)

Easy

Appeared in: UPPSC-2021

Explanation

The vastus lateralis muscle (anterolateral thigh) is the preferred IM injection site for infants and children up to age five.
This muscle is the largest and most developed in this age group, ensuring proper medication absorption.
It is a safer site because it is located away from major nerves (like the sciatic nerve) and blood vessels, minimizing the risk of injury.
The site can accommodate the appropriate volume of medication for this age group, typically 0.5 mL for infants and up to 2 mL for young children.

Option A: The deltoid muscle is small and not well-developed in children under five, making it unsuitable for most IM injections and increasing the risk of injury to the radial nerve.
Option C: While the ventrogluteal site is safe, the landmarks can be more difficult to identify correctly in infants and small children compared to the vastus lateralis.
Option D: The dorsogluteal site is contraindicated and should not be used for IM injections in children due to the high risk of sciatic nerve damage, which can cause permanent paralysis.

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 Pediatrics as background academic context rather than a clinical decision trigger.
Patient Safety: Correct site selection is a critical nursing responsibility to prevent serious complications like nerve damage, abscess formation, or intravascular injection.
Medication Efficacy: Injecting into a well-developed muscle ensures the medication is absorbed properly and at the intended rate, leading to the desired therapeutic effect.
What if? If the child was 7 years old and required a routine, small-volume vaccine (e.g., Tdap), the deltoid muscle would be an appropriate and often preferred site, as it is more developed by that age.

How to Approach the Question

First, identify the key parameters in the question: the procedure is an 'intramuscular injection' and the patient population is 'under five-year-old children'.
Recall the anatomical and developmental differences in muscle mass for this age group.
Evaluate each option based on safety and muscle development. The primary consideration is avoiding major nerves and blood vessels.
Eliminate the dorsogluteal site immediately due to the high risk of sciatic nerve injury.
Compare the remaining sites. The deltoid is too small in this age group. The ventrogluteal is an option but is less commonly used and harder to landmark in infants than the vastus lateralis.
Conclude that the vastus lateralis is the largest, safest, and most accessible muscle, making it the preferred site.

Concept Tested & Keywords

Concept Tested: Intramuscular (IM) Injection Sites in Pediatrics
Stem keywords: intramuscular injection, under five-year-old children, preferred site
Lead-in keywords: Which one
Clinical cues: Age group: under five-year-old children, which is a critical factor for muscle development and site selection.

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