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10 Cards in this Set

  • Front
  • Back
What is normal airway resistance?
1-2 cm H2O/L/second of flow
What causes increased airway resistance?
tracheal obstruction (tounge), bronchitis, emphysema, asthma
What is closing volume?
The volume at which the pressure in the lungs is greater than in the small airways, causing their collapse. [not including RV]
How is closing volume determined?
N2 concentration is measured. In stage III, N2 concentration rises as Zone 1 is exhaled, and this marks airway closure
What is closing capacity?
Closing volume+residual volume
What increases closing volume?
Small airway disease, chronic bronchitis, emphysema, interstitial edema, CHF
Describe the formula for diffusion/uptake of gas
Vgas = (Area/Thickness) x D x (P1-P2)
When may PFTs be warranted in surgical patients?
Hx of COPD, smoker w/ persistent cough, Hx of wheezing/DOE, Chest wall or spinal abnormalities, morbid obesity, thoracic surgery, Age > 70, upper abd surgery
What are the effects of smoking?
Decrease cilliary motility, increase sputum production -> V/Q mismatch, bronchotis ds, airway hyperreacivity, gas trapping
What are the effects of smoking cessation for 12-24 hours?
decreases CO level