The paediatrician has advised phototherapy for the newborn with jaundice. Phototherapy is advised because?

RML 2023

Child Health Nursing (Pediatrics)

Easy

Appeared in: RML 2023

Explanation

Phototherapy is a primary treatment for neonatal jaundice that uses light energy to make bilirubin easier to excrete.
The light converts toxic, fat-soluble unconjugated bilirubin into non-toxic, water-soluble isomers (mainly lumirubin).
These water-soluble isomers can be excreted in the urine and bile without needing to be conjugated by the liver.
Therefore, phototherapy effectively helps the body break down and eliminate excess bilirubin.

Option A: Phototherapy has no direct effect on the immune system. Its purpose is to treat hyperbilirubinemia, not to boost immunity.
Option B: The primary water-soluble isomer created by phototherapy is lumirubin, not hemicubin. 'Hemicubin' is not a relevant term in this process.
Option C: Phototherapy bypasses the liver's conjugation process. It works in the skin and blood to convert bilirubin into excretable forms, which is necessary because the newborn's liver is too immature to conjugate the bilirubin efficiently.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Mechanism of action of phototherapy in neonatal jaundice as background academic context rather than a clinical decision trigger.
A nurse's primary role during phototherapy is to maximize treatment efficacy while ensuring the infant's safety.
Key safety checks include ensuring proper eye protection to prevent retinal damage, monitoring temperature to avoid hypo/hyperthermia, and assessing hydration status due to increased insensible water loss.
What if? If the bilirubin levels continue to rise rapidly despite intensive phototherapy, it may indicate a severe underlying condition like hemolytic disease. The nurse should anticipate the need for an exchange transfusion and prepare the necessary equipment and consents.

How to Approach the Question

First, identify the core of the question: it asks for the fundamental reason or mechanism of phototherapy for jaundice.
Recall that neonatal jaundice is due to high levels of unconjugated bilirubin, which is not water-soluble and hard for the immature liver to process.
Evaluate each option based on this knowledge. Option A (immunity) is unrelated. Option B (hemicubin) uses an incorrect term. Option C (liver conjugation) is the opposite of what phototherapy does; phototherapy is a workaround for the liver's inability to conjugate.
Option D, 'helps in the breakdown of bilirubin,' is the most accurate and simplified description of the process. The light energy breaks down or transforms bilirubin into a form the body can excrete.
Therefore, by eliminating the incorrect options, the most plausible answer is identified.

Concept Tested & Keywords

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 172-174

E6 Text Book Of Pediatric Nursing 3rd Panchali Pal — Part 1 (pp 36-238 of 713) p. 194-196

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1124-1126