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11 Cards in this Set
- Front
- Back
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What is oxygen therapy used for?
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Used to ensure an acceptable SaO2 (usually 89% is OK)
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What are problems with oxygen therapy?
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Expense
Supports combustion Tethering CO2 retention: Loss of hypoxic drive to breathe Increased CO2 causes sedation |
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How can CO2 retention with oxygen therapy be avoided?
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Titrate oxygen slowly, monitoring mental status and SaO2.
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When can aerosol therapy be administered?
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Quiet breathing
BiPAP Mechanical ventilation |
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What is the purpose of airway clearance measures? Who does not need it?
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To prevent atelectasis
A patient who can cough productively |
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2 functions of mechanical ventilation
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Reduce work of breathing
Improve gas exchange |
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MOA of mechanical ventilation?
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Change airway pressure - increased pressure results in increased flow - overcoming resistance and elastance
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How does negative pressure ventilation work?
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Apply negative pressure to the body and hence the lungs in a sealed box. Outside air will move in from higher atmospheric pressure to lower intrathoracic pressure (seldom used for modern care).
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What are the 2 principal modes of ventilation?
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Pressure cycled
Volume cycled |
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Describe pressure cycled ventilation.
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Pressure is applied to the airway for a given time. No tidal volume is guaranteed.
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Describe volume cycled ventilation.
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Volume is delivered using whatever pressure is required.
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