Pulmonary Function Testing -Rogers Flashcards
When to not and do pft
Not = no Sx Do = when difficulty breathing and coughing, cyanosis, monitor therapies
What do you measure in the pft
Forced vital capacity (FVC) : inhale as deep as patient can, then exhale as long, hard, and forcefully as possible = how much expired
Forced expiratory volume in 1 sec (FEV1): how much expired after 1 sec
* FEV1/FVC = 80% in normal
Diffusion capacity
Bodies ability to take up gas
= decreases when
1. Blood cant bind to O2 or CO2 effectively
2. SA in alveoli decrease (emphysema)
3. Low BF to alveoli (pulmonary embolism)
4. Gas exchange membrane thickens (Fibrosis)
Residual volume
Volume of air in lungs after full expiration
COPD lung volume graph shows
Residual V and Total lung capacity (max inhaled volume) shifted RIGHT = higher then normal
However, Flow rate of expiration is lower + FVC is lower
COPD is an example of what type of lung problem
Obstructive
Restrictive lung problem shows what on the lung volume graph
Residual volume and TLC shifted LEFT = less then normal
+ lung decrease in FVC and expiration flow rate
= parallel slope of coming down from peak of expiration flow rate on graph
Bronchodilator is what
B2 -agonist = dilate bronchioles
FEV1/FCV is lower then normal
Obstructive pattern
FVC is lower then normal is obstructive
Mixed reason
FVC is not lower then normal is obstructive
Obstructive pattern
FVC is lower then normal is restrictive
Restrictive pattern
FVC is not lower then normal is obstructive
Normal spirometry
68yo F SOB no cough or wheezing, Systemic lupus erythematosus, HTN, FVC = 1.85 L (normal is 2.39L) FEV1 = 1.64L (normal is 1.80L) FEV1/FVC = 88.6% (expect 67%) RV= reduced TLC = reduced
Restrictive pattern
51yo F SOB, cough, wheezing especially in summer or exertion
Received with bronchodilator , no smoking
FVC = 2.42L (normal 2.24L)
FEV1 = 1.52L (normal 1.86L)
FEV1/FVC = 58% (normal is 73%)
Obstruction pattern, probably asthma
