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11 Cards in this Set
- Front
- Back
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how does perfusion or bloodflow in the lung change during PPV?
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PPV compresses small vessels and shifts perfusion to poorly ventilated areas.
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During PPV, what's the net effect of redistribution on the VQ ratio?
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decreases matching of ventilation and perfusion, resulting in
-increased deadspace - increased A-a gradient. |
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Prolonged hypoventilation can cause:
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hyperkalemia
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Hyperkalemia can result in what EKG changes:
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-peaked T waves
-ST depression -long PR interval |
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prolonged hyperventilation can cause:
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hypokalemia
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Hypokalemia can result in what EKG changes:
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-wide complexes,
-inverted P waves, -PVCs-secondary to hypokalemia |
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what are the two methods for treating metabolic acidosis in mechanically ventilated patients?
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-bicarbonate administration
- increase in minute ventilation |
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how long does it take for 95% of the alveoli in a normal lung to fill with air?
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three time constants;
0.3 seconds |
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how many time constants does it take to fill 98% of the alveoli and 99% of the alveoli?
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98%= 4 time constants
99%= 5 time constants |
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what are the two major factors that affect alveolar time constants?
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compliance and resistance
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how do you help prolong the inspiratory phase for your restricted patient?
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increase inspiratory time, and decrease inspiratory flow
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