What is the primary measurement obtained from pulse oximetry in relation to arterial blood?
ARate of flow
BOxygen saturation
CBlood volume
DBlood coefficient
Chronic lung disease in infancy is defined as
ANeed for supplemental oxygen at 36 weeks postmenstrual age
BTachypnoea > 50 breaths/ min within 1 week of birth
CPresence of bilateral infiltrates on chest Xray for 2 weeks
DReticulogranular pattern on chest Xray for 6 weeks
A 56-year-old male with COPD presents with worsening shortness of breath. ABG analysis shows PaO2 of 55 mmHg. Which physiological mechanism primarily contributes to his hypoxemia?
ARight-to-left shunt
BHypoventilation
CVentilation-perfusion mismatch
DReduced inspired oxygen tension
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