Chapter 38 Medical Gas Therapy – Flashcards
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A patient experiences tachycardia with PVCs during suctioning. What is causing this?
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Inadequate pre-oxygenation
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What would you do for a patient who has a history of carbon dioxide retention when he becomes lethargic and is difficult to arouse. He is receiving oxygen at 6 LPM via nasal cannula.
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Reduce the flow to 2 LPM and obtain an ABG
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If your patient is receiving oxygen therapy via a nonrebreather @ 10 LPM and the bag is deflating with each inspiration. What action would you take to correct this?
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Increase the flow to the mask
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If you are delivering a mixture of helium and oxygen what delivery device would you use?
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Nonrebreathing mask (nonrebreather)
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A mixture 80/20 mixture of helium and oxygen is administered. The oxygen flowmeter is set at 10 LPM. What is the actual flow delivered to the patient?
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18L
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A patient is receiving 40% oxygen via an air entrainment mask with a flowmeter set at 8 LPM. What is the total flow delivered to the patient?
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32 LPM 40/8 = 3:1 (ratio) 24+8 = 32
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A patient requires a flow rate of 40 LPM to meet his inspiratory demand for gas. He is to receive oxygen via a Venturi Mask set at 24%. What is the minimum flow setting on the flowmeter to produce the appropriate flow?
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2 LPM
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You should add a humidifier to a nasal cannula when?
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the flow exceeds 4 LPM
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What is acute hypoxemia?
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A sudden decrease of O2 levels in the blood.
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What are the threshold criteria for defining hypoxemia in adults according to the AARC Clinical Practice Guidelines? PaO2 and SaO2
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PaO2 >60mmHg SaO2 >90%
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In what acute cardiac condition is oxygen therapy especially important?
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MI
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State the 3 basic ways to determine if a patient needs oxygen therapy.
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Laboratory measurements - Hgb sat, partial pressure of O2 Specific clinical problem or condition beside techniques (assessment)
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Oxygen toxicity affects what two organ systems and what does it affect?
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CNS - tremors, twitching and convulsions. Lungs - damage capillary endothelium, interstitial edema and thickening of alveolar capillary membrane.
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Low Flow System
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Provides some of the patient's inspiratory needs
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Reservoir System
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May meet needs if no leaks occur.
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High Flow System
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Always exceeds patient's inspiratory needs.
