SJH Nursing Officer - 2019
Child Health Nursing (Pediatrics)
Hard
The nurse would expect to find in a newborn with birth asphyxia is?
Appeared in: SJH Nursing Officer - 2019
Explanation
- Birth asphyxia is a condition caused by a lack of oxygen and blood flow to the baby at birth.
- This oxygen deprivation forces the body's cells to switch to anaerobic metabolism, which produces lactic acid as a byproduct, leading to metabolic acidosis.
- Simultaneously, impaired breathing prevents the baby from clearing carbon dioxide, causing it to build up in the blood (hypercapnia), which results in respiratory acidosis.
- The combination of these two processes results in a mixed acidosis, a key finding in an asphyxiated newborn.
Why Other Options Were Wrong
- Option A: This is incorrect. Asphyxia is a state of severe oxygen deficiency (hypoxemia), not excess oxygen.
- Option C: This is incorrect. Asphyxia leads to impaired ventilation and retention of carbon dioxide, causing high CO2 levels (hypercapnia), not low levels.
- Option D: This is incorrect. The acidosis seen in birth asphyxia is due to the buildup of lactic acid from anaerobic metabolism (lactic acidosis), not from the breakdown of fats into ketones.
Related Visual
Clinical Relevance
- Nursing practice connection: Knowing Pathophysiological findings in neonatal birth asphyxia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
- Recognizing acidosis is critical for initiating timely neonatal resuscitation and preventing long-term neurological damage like Hypoxic-Ischemic Encephalopathy (HIE).
- Umbilical cord blood gas analysis is the most objective method to assess the metabolic state of the newborn at birth and guides further management and prognosis.
- What if? If a newborn with asphyxia is aggressively hyperventilated during resuscitation, it could lead to iatrogenic hypocapnia. This can cause cerebral vasoconstriction, reducing blood flow to an already injured brain and worsening the outcome. Therefore, ventilation must be carefully managed.
How to Approach the Question
- First, understand the term 'birth asphyxia', which implies a lack of oxygen at birth.
- Consider the body's immediate response to a lack of oxygen. Cellular metabolism switches from aerobic (using oxygen) to anaerobic (without oxygen).
- Recall that the primary byproduct of anaerobic metabolism is lactic acid. An accumulation of acid in the blood leads to acidosis.
- Also, consider the respiratory component. Asphyxia involves poor or absent breathing, which means carbon dioxide (an acid when dissolved in blood) is not exhaled and builds up, further contributing to acidosis.
- Evaluate the options based on this physiological cascade. Hyperoxemia (high oxygen) and Hypocapnia (low CO2) are the opposites of what occurs. Ketosis is a different metabolic process not central to acute asphyxia. Acidosis is the direct and expected consequence.
Concept Tested & Keywords
- Concept Tested: Pathophysiological findings in neonatal birth asphyxia
- Stem keywords: newborn, birth asphyxia
- Lead-in keywords: expect to find
- Negative lead-in flag: false
Question ID
QIRFTUEHhnTHCo-XWdT3kA
Reference Book
E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 11-16
E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 159-161
E6 Obstetrics Williams p. 1-7
Practise the full SJH Nursing Officer - 2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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