All are characteristic of neonatal asphyxia except?

HPSSC Staff Nurse - 2021

Child Health Nursing (Pediatrics)

Easy

Appeared in: HPSSC Staff Nurse - 2021

Explanation

Hypocapnia is a state of reduced carbon dioxide (CO₂) in the blood, typically caused by hyperventilation (breathing too fast or too deep).
Neonatal asphyxia is characterized by respiratory failure, meaning the newborn is not breathing adequately or at all.
This failure to breathe leads to the retention of CO₂, causing hypercapnia (high CO₂), which is the opposite of hypocapnia.
Therefore, hypocapnia is not a characteristic of neonatal asphyxia.

Option A: Hypoxia, or a lack of oxygen, is a core, defining feature of neonatal asphyxia resulting from the failure of gas exchange at birth.
Option C: Acidosis is a hallmark of neonatal asphyxia. It is a mixed acidosis, resulting from both respiratory acidosis (due to high CO₂/hypercapnia) and metabolic acidosis (due to lactic acid from anaerobic metabolism).
Option D: Hypo-perfusion (ischemia) is a key consequence of asphyxia. The body shunts blood away from peripheral tissues and non-vital organs to preserve function in the brain and heart, leading to systemic hypo-perfusion.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pathophysiology of Neonatal Asphyxia as background academic context rather than a clinical decision trigger.
Recognizing the signs of neonatal asphyxia is critical for immediate resuscitation in the delivery room. The Apgar score is a rapid assessment tool used to evaluate a newborn's clinical status, including respiratory effort.
The primary goal of management is to reverse hypoxia, hypercapnia, and acidosis to prevent irreversible organ damage, particularly Hypoxic-Ischemic Encephalopathy (HIE), a severe form of brain injury.
What if? If a newborn presents with hypocapnia instead of hypercapnia, the cause is likely hyperventilation. This could be due to iatrogenic causes (e.g., overly aggressive resuscitation with a bag-mask) or a central nervous system issue causing rapid breathing, rather than asphyxia.

How to Approach the Question

First, identify the keywords in the question stem: 'neonatal asphyxia' and the negative keyword 'except'.
The word 'except' signals that three of the options are true characteristics of neonatal asphyxia, and one is false. Your task is to find the false statement.
Recall the basic pathophysiology of asphyxia: it is a failure of breathing.
Evaluate each option based on this core problem. Failure to breathe means no oxygen in (Hypoxia) and no carbon dioxide out (Hypercapnia).
Hypoxia forces cells into anaerobic metabolism, producing lactic acid (Metabolic Acidosis). Hypercapnia causes Respiratory Acidosis. Together, they cause severe Acidosis.
The body tries to compensate by shunting blood to vital organs, causing Hypo-perfusion elsewhere.

Concept Tested & Keywords

QTOpGl7sdol5jXaKFEV1tk

E6 Ghai Essential Pediatrics(pp 26-904 of 913) pp. 159-161, 160-162

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1071-1073