RES142 Pulmonary Diagnostics.docx

# The left ventricle contracts and pushes the blood out

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oxygenated blood then passes through the bicuspid valve into the left ventricle. The left ventricle contracts and pushes the blood out through the aortic semilunar valve and into the aorta. The aorta is the largest artery which then feeds the blood to the smaller arteries throughout the body (Moini 2012). 2. What are the normal values for PaO 2 ? What are the values for determining the severity of hypoxemia? Acceptable arterial range of PaO2 is 80-100 mmHg. Mild hypoxemia would have a value between 60-79 mmHg. Moderate hypoxemia would have a value between 40-59 mmHg. Severe hypoxemia would be any value less than 40 mmHg (McNeily 2015). 3. Explain the significance of PAO 2 – PaO 2 or P(A-a)O 2 . When and why is it useful? How is it calculated? PAO2 is the partial pressure of oxygen in the alveoli. It is calculated using the alveolar gas equation. The formula to calculate is PAO2= (P B -P H2O ) FiO2-PaCO2/0.8 (McNeily 2015).

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WEEK 2 ASSIGNMENT 3 The PAO2 is required to calculate both the alveolar-arterial (A-a) gradient of oxygen and the amount of right-to-left cardiac shunt. The alveolar and arterial oxygen tension difference P(A-a)O2 is an equation used to measure the efficiency of gas exchange (Kacmarek 2017).
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• Fall '18
• Tim Dunkley

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