14 Questions
What is the definition of hypoxemia?
Partial pressure of oxygen of less than 80 mm Hg
When is cyanosis manifested as a sign of hypoxemia?
Always a late sign of severe hypoxemia
Which condition is NOT a cause of venous admixture in hypoxemia?
Pulmonary embolism
What is the definition of serious, potentially life-threatening hypoxemia?
Partial pressure of oxygen of less than 60 mm Hg
What happens to plasma PO2 when there is interference with the respiratory membrane?
Decreases
Which is often used as a surrogate marker of PaO2?
SaO2
Which parameter is primarily determined by hemoglobin concentration and is not considered to be a marker of hypoxemia?
Venous blood oxygen content
What is the normal range of PaO2 at sea level?
80-110 mm Hg
What is the driving force that leads to oxygen diffusion down to the mitochondria?
Partial pressure of oxygen in the plasma (PO2)
What does the observation of cyanosis commonly signal?
Low tissue oxygenation
When does cyanosis manifest as a sign of hypoxemia?
During severe hypoxemia
What are the three causes of hypoxemia?
Low inspired oxygen concentration, hypoventilation, venous admixture
What can pulse oximeters noninvasively, continuously, and automatically monitor?
Hypoxemia
What does SaO2 use to measure hemoglobin saturation with oxygen?
Many wavelengths of red to infrared light.
This quiz covers the definition of hypoxemia, its manifestation as cyanosis, and the three main causes of hypoxemia: low inspired oxygen concentration, hypoventilation, and venous admixture. It also explores the four causes of venous admixture, including low ventilation-perfusion regions and small pulmonary arteriovenous malformations.
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