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12 Cards in this Set
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- Back
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What is partial pressure of O2 (PO2)?
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arterial blood gas, most accurate
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What is the advantage of measuring Oxyhemoglobin Saturation (SaO2)?
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1) non-invasive
2) most accurate |
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How much of air is comprised of oxygen?
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21% of air is O2
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What comprises a hemoglobin molecule?
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1) 4 sub units, each sub unit can bond with 1 O2 molecule
2) Composed of protein chain 3) Contains atoms of iron and O2 binding site 4) picks up O2 in lungs |
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What SaO2 level (percent) requires therapeutic intervention?
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<88%
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What is the relationship between high oxyhemoglobin saturation and partial pressure O2?
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high saturation --> large changes in PO2, small changes in saturation
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What is the relationship between low oxyhemoglobin saturation and partial pressure O2?
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low saturation --> small drops in PO2, large changes in saturation
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What is hypoxemia?
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low blood oxygen levels
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What are the consequences of hypoexmia?
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1) Neurophysiological-impaired memory and judgement
2) Physiologic- hyperventilation, tachycardia, polcythemia, vasoconstriction, cardiac dysfunction |
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What medical disease can cause hypoventilation?
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1) chronic lung disease
2) congestive heart failure 3) obesity 4) neuromuscular diseases 5) drugs with muscle relaxants or respiratory depressant effects. |
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What are the treatments for hypoxemia?
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1) eliminate obstructive apnea events
2) Improve medical conditions 3) Supplemental O2 4) Supplemental Ventilation |
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How does supplemental ventilation treat hypoxemia?
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increases breath size which increases amt of O2 available
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