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Cards In This Set
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What volume can you obtain by subtracting expiratory reserve volume from functional residual volume?
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Residual Volume
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Closing capacity is equal to what percentage of TLC?
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Closing volume plus residual volume and is expressed as a percentage of TLC (30% of TLC)
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The single breath nitrogen test is also called what?
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Resident gas technique
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What is the amount of time required to washout the lungs in the nitrogen washout test?
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7 minutes
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What percent of the vital capacity is the expiratory reserve volume?
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20-25% of vital capacity
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What test is used to measure closing volume?
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Single breath nitrogen washout
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In a single breath nitrogen washout curve, phase 4 indicates what?
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It is the volume referred to as closing volume
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In a normal healthy adult, what percentage of the vital capacity is closing volume equal to?
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10%
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Define EPP ( equal pressure point)
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The point at which pleural pressure and intraluminal pressure are equal
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What is the major disadvantage of the helium dilution closed circuit equilibration method for determining lung volume?
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Alveolar gas may be trapped in the lungs of patients with obstructive airway disease. Therefore all the helium may not washout causing the volume to be lower.
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State the normal value for the volume of isoflow
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Less than 10% of VC
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What is the formula for determination of normal vital capacity for males?
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VC=27.63 - (0.112 x age) x ( height in cm)
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Peripheral airways contribute what percentage tot total airway resitence in the normal lung?
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About 10 - 20%
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How are the changes in the thoracic gas volume measured with the variable volume plethysmograph?
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Spirometer
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How are the changes in lung volumes calculated with the variable pressure plethysmograph?
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Pressure transducer
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