The preterm infant's elbow may easily be brought across the chest with no resistance. This is the?

RRB Nsg. Superintendent-20 July 2019 (Shift-1)

Pediatric Nursing

Easy

Appeared in: RRB Nsg. Superintendent-20 July 2019 (Shift-1)

Explanation

The Scarf sign is a specific maneuver in the Ballard scoring system used to assess a newborn's neuromuscular maturity and estimate gestational age.
The question describes the classic finding of a positive Scarf sign in a preterm infant, where low muscle tone (hypotonia) allows the elbow to be pulled across the chest's midline without resistance.
This lack of resistance is a direct indicator of the immaturity of the central nervous system and musculature in a preterm baby.

Option A: The Sunset sign is an ocular finding (downward deviation of the eyes) related to increased intracranial pressure, not a test of limb muscle tone.
Option B: The Tonic neck reflex, or 'fencing reflex,' is a postural response triggered by turning the head to the side, causing limb extension and flexion. It does not involve passively moving the arm across the chest.
Option D: The Grasp reflex involves the infant's fingers closing around an object placed in the palm. It assesses a different reflex pathway and does not evaluate the passive tone of the shoulder and arm.

Visual 1: Diagram - A side-by-side illustration showing the Scarf sign being performed on a preterm infant (elbow crosses midline) versus a term infant (elbow does not cross midline). This would clearly demonstrate the difference in muscle tone.
Visual 2: Chart - A summary chart of the key components of the New Ballard Score, including posture, square window, arm recoil, popliteal angle, scarf sign, and heel to ear, with illustrations for each score.
Visual 3: Photograph - An actual photograph of a nurse performing the Scarf sign on a neonate, highlighting the position of the arm and elbow relative to the chest.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Neonatal assessment and primitive reflexes as background academic context rather than a clinical decision trigger.
Assessing the Scarf sign is a fundamental nursing skill in the neonatal intensive care unit (NICU) and newborn nursery. It is part of the broader gestational age assessment (Ballard Score), which helps the healthcare team anticipate potential problems related to prematurity (e.g., respiratory distress, feeding difficulties, temperature instability).
An accurate gestational age assessment is crucial for providing appropriate care. A baby assessed as more preterm than initially thought may require closer monitoring, different feeding strategies, and proactive interventions to prevent complications.
What if? If a full-term infant showed a positive Scarf sign (no resistance), it would be an abnormal finding. This could indicate significant hypotonia due to a neurological issue (like a brain injury during birth), a genetic condition, or severe illness (like sepsis). The nurse should immediately report this to the physician for further evaluation.

How to Approach the Question

First, read the question carefully and identify the key clinical description: a preterm infant's elbow is brought across the chest without resistance.
Next, analyze the options provided. Each option is a specific neonatal sign or reflex.
Recall or look up the definition of each term. What does 'Sunset sign' mean? What is the 'Tonic neck reflex'? What is the 'Scarf sign'? What is the 'Grasp reflex'?
Compare the clinical description from the question to the definition of each option.
The description of pulling the arm across the chest like a scarf directly matches the procedure for the 'Scarf sign'. The finding of 'no resistance' in a 'preterm' infant is the classic positive result for this sign.
Eliminate the other options because their definitions do not match the action described in the question.

Concept Tested & Keywords

Concept Tested: Neonatal assessment and primitive reflexes
Stem keywords: preterm infant, elbow, across the chest, no resistance
Lead-in keywords: This is the?
Clinical cues: The description of the physical maneuver (pulling elbow across the chest) is the primary clue.
Clinical cues: The finding of 'no resistance' in a 'preterm infant' points towards hypotonia, a key feature of prematurity.

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