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10 Cards in this Set
- Front
- Back
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What are the sxs of a variable intrathoracic obstruction on a flow-volume loop?
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decreased expiratory flow
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What are the sxs of a diffuse airway obstruction on a flow-volume loop?
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Decreased flow in segment near residual volume
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What are the sxs of COPD on a flow-volume loop?
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Expiratory concavity
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What are the sxs of upper airway obstruction on a flow-volume loop?
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Inspiratory/expiratory "flattening" of the top/bottom of the loop
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What is total compliance?
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delta V/delta P
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How do compliances add?
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Reciprocally: 1/Ct = 1/Cl + 1/Ccw
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What is hysteresis?
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The same pressure during expiration generates higher volumes that during inspiration, i.e. it takes higher pressures to inflate than to deflate.
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What is dynamic compliance?
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The sum of elastic+resistive forces opposing lung inflation
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What is normal dynamic compliance?
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40-80 ml//cmH2O
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What is the formula for dynamic compliance?
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Cdyn = TV/peak pressure - PEEP
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