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26 Cards in this Set
- Front
- Back
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What is ERV?
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Expiratory reserve volume: the volume of air that can ve forcefully expired over normal tidal volume
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what is the volume of air that can ve forcefully inspired over normal tidal volume
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the IRV: inspiratory reserve volume
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WHat is the Tidal volume?
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the amount of air inspired with or expired with each breath
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What values make up the inspiratory capacity?
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TV+IRV
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what values make up the functional residual capacity?
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ERV+ RV
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the value that is the IRV+TV+ERV is = to the?
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vital capacity
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What is the total lung capacity?
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VC + RV
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Spirometry measures the volume of air that is ____?
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breathed in and out
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what does plethysmography measure?
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absolute lung volume
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List the 4 pulmonary function tests
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1. lung volumes-plethsymography
2. airway function - spirometry 3. gas exchange- puls oximetry, blood gas 4. exercise capactiy- cardiopulmonary exercise tests |
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What are the indications for PFT's?
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-patient history/physical exam
-detection of pulmonary disease -Assessment of severity or progression of disease -Pre-op evaluation -evaluation disability or impairment |
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What are the factors that affect spirometry and plethsymography?
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-age
-sex -height -weight -race -disease |
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What type of maneuvers are used in spirometry?
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slow and forced breathing maneuvers
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The majority of ___ can be exhaled in < 3 seconds in normal people, but often is much more prolonged in obstructive disease.
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The FVC
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The FVC is measured in __
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liters
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For the FVC, what %s indicated normal, mild reduction, moderate reduction, and severe reduction?
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Normal: 80-120%
Mild obstruction: 70-79% moderate obstruction: 50-69% Severe: < 50% |
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Define the FEV1
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the volume of air that can be forcefully expired from full inflation (TLC) in the first second
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What is a normal FEV1?
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75-80%
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What can FEV1/FVC be used to determine?>
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lung disease
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What are the %s for the FEV1?
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Normal: > 75%
MIld Obstruction: 60-75% Moderate obstruction: 50-59% Severe: < 49% |
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What is the FEF 25/75?
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the mean forced expiratory flow during middle half of FVC and depends heavily on the FVC
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List the interpretation of % predicted of the FEF 25-75
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Normal: >60%
Mild: 40-60% moderate: 20-40 severe: <10% |
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Which value if increased is very indicative of a restriction?
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the FEV1/FVC
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Increased ___ and FVC are reduced b/o decreased lung volume-- ____
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FEV1; Restrictive
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What is involved in the acceptability criteria of the PFTs?
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-Good start of the test
-no coughing -no variable flow -no early termination -reproducibility |
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What is the reproducibility criteria for Spirometry?
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-minimum of 3 maneuvers with 2 reproducible
-FVC and FEV1: 2 highest measurements fall within 150mm of each other - |
