Term
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Definition
| upper airway gas from the anatomic dead space (VDanat) consisting of 100% O2 |
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Term
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Definition
| mixed dead space gas in which the relative concentrations of O2 and N2 change abruptly as the V Danat volume is expired. |
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Term
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Definition
| a plateau caused by the exhalation of alveolar gas in which relative O2 and N2 concentrations change slowly and evenly. |
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Term
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Definition
| an abrupt increase in the concentration of N2 that continues until RV is reached. |
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Term
Raw in healthy adults
(50-30-20) |
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Definition
nose, mouth, upper airway = 50%
trachea and bronchi = 30%
small airways = 20% |
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Term
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Definition
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Term
| MVV how do you perform it? |
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Definition
patient breaths deeply and rapidly for a 12-second interval
volume is approximately 50% of VC and rate is 90-110 bpm
two acceptable maneuvers are obtained: values within 20%
report highest MVV |
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Term
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Definition
- closed circuit
- stop test when line is flat (plateau)
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Term
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Definition
o Uses 100% O2
o When it doesn’t vary more than .02 or 1 1/2 then test is done
o Most common
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Term
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Definition
| will be less in non-conducting airways |
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Term
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Definition
- = IC and ERV
- end-expiratory volumes varies by less than 100ml for 3 preceding breaths
- volume plateau observed at maximal inspiration and expiration
- two acceptable VC maneuvers should be obtained; volumes within 150ml
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