PFTs Flashcards
what do pulmonary function tests measure?
lung volumes and capacities
what would eliminate asthma from a differential?
non-reversibility when applying a bronchodilator
type of disorder in which air is trapped in the lungs and patient has difficulty exhaling all the air in the lungs, leading to decreased forced expiration, prolonged expiration, and normal/increased volume in lungs
obstructive
type of disorder in which the patient has difficulty fulling expanding the lungs, leading to decreased total volume and decreased forced expiration
restrictive
total exhaled volume
forced vital capacity (FVC)
volume exhaled in the first second
Forced expiratory volume in 1 second (FEV1)
what is our spirometry ratio?
FEV1/FVC
volume of air in the lungs at end of maximal inspiration
total lung capacity (TLC)
how would lung volumes change in restrictive lung disease?
decrease
how would the FEV1/FVC ratio change in obstructive lung disease?
decrease
how would the FEV1/FVC ratio change in restrictive lung disease?
increase or normal
how would TCL be affected in obstructive lung disease?
increase / normal
how would FVC be affected in obstructive lung disease?
decrease / normal
how would FEV1 be affected in obstructive lung disease?
decrease drastically
how would FEV1/FVC be affected in obstructive lung disease?
decrease
