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17 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is the definition of FVC (forced vital capacity)?
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total volume of air exhaled as fast as possible after maximal inhalation
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Interpreting Laboratory Data p194
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What is the normal FEV1?
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>80% of predicted normal value (based on gender, age, and height)
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Interpreting Laboratory Data p194
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For best results when performing spirometry ...
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Patient should:
loosen/remove restrictive clothing (ties, belts) wear nose clip to minimize air loss through nose sit/stand up straight completely fill and empty lungs There should be no: hesitation/false start coughing during first second early termination evidence of leak (mouth not tightly around mouthpiece) evidence of obstruction (glottic closure, tongue, false teeth) |
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What are the indications for ordering PFTs?
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diagnostic, evaluation and monitoring of respiratory disease
diagnosis of asthma and COPD monitoring after thoracic radiation, lung transplantation, drugs with potential lung toxicity |
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How is air flow affected in obstructive diseases?
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decrease flow of air but not volume
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How is air flow affected in restrictive diseases?
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decrease flow and volume of air
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What is forced vital capacity (FVC)?
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total volume of air exhaled as hard and fast as possible after maximal inhalation
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What is forced expiratory volume in 1 second (FEV1)?
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amount of air exhaled after 1 second
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What is FEF(25-75)?
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measures airflow rate during forced expiration from 25%-75% of vital capacity
25-75% is though to measure airflow in medium and small airways (bronchioles and terminal bronchioles) |
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What is peak expiratory flow rate (PEFR)?
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measure of maximum airflow rate (using peak flow meters)
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What are the indications for peak flow meters (to measure peak expiratory flow rate)?
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peak flow meters are useful indications of large airway function → monitor airway obstruction in asthmatics
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What is body plethysmography?
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method used to measure lung volume
patient sits in airtight box → told to inhale and exhale agaisnt a closed shutter → change in pressure measured during respiration → can calculate FRC, IC, RV, TLC |
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What is residual volume (RV)?
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volume of air remaining in lungs after forced expiration
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What diseases have increased residual volume?
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COPD
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What is inspiratory capacity (IC)?
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volume of air measured from beginning of inspiration to maximal inspiration
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What diseases show increased/decreased functional residual volume (FRC)?
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INCREASED:
hyperinflation → airway obstruction → obstructive lung diseases DECREASED: pneumonia restrictive lung diseases → pulmonary fibrosis |
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What are the FEV1/FVC, FEV1, FVC, RV, and TLC results for obstructive and restrictive lung diseases?
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