True/False MCQ · Neonatal Respiratory Distress
Concerning blood gases and oxygen therapy in the newborn, the following statements are correct:
- AA normal newborn pH is approximately 7.35-7.45
- BAn arterial PaCO2 of 60 mmHg is normal in a newborn
- CThe target oxygen saturation for a preterm baby is around 90%
- DHigh oxygen levels are beneficial and should be maximised in preterm babies
- EA capillary sample gives an accurate measure of oxygenation (pO2)
Show answers and explanation
- A. True
- B. False: A PaCO2 of 60 mmHg is raised (normal 35-45 mmHg), not normal.
- C. True
- D. False: High oxygen is harmful in preterm babies and should be titrated, not maximised.
- E. False: An accurate pO2 cannot be taken from a capillary (or venous) sample; an arterial sample/SpO2 is needed.
Blood gases and oxygen therapy
- A normal newborn pH is ~7.35-7.45 (PaCO2 35-45 mmHg, PaO2 50-80 mmHg).
- A PaCO2 of 60 mmHg is raised (normal 35-45), indicating a ventilatory problem.
- The target saturation for a preterm baby is ~90% (term ~95%).
- High oxygen is harmful in preterm babies (brain/eyes), so it is titrated, not maximised.
- An accurate pO2 (oxygenation) cannot be taken from a capillary (or venous) sample - an arterial sample/SpO2 is needed.
Why A is true
Normal newborn pH is ~7.35-7.45.
Why B is false
A PaCO2 of 60 mmHg is raised, not normal.
Why C is true
Preterm target saturation is ~90%.
Why D is false
High oxygen is harmful in preterm babies.
Why E is false
Capillary samples do not give an accurate pO2.
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