Pulmonary Disease 9% Flashcards
Obstructive dz (dilated)
COPD, Bronchiectasis
Obstructive (constricted)
Asthma
Intrathoracic Restrictive (constricted)
Fibrosis, Sarcoidosis, pneumoconiosis
Extrathoracic Restrictive
Chest Cage: kyphosis, spondylitis, obesity.
neuromuscular: (M.gravis, GB syndorme, muscular dystrophy
Normal FEV1/FVC
> 80%
Obstructive dz FEV1/FVC
<80%
Restrictive dz FEV1/FVC
> 80%
COPD
- dec FEV1,
- dec FEV1/FVC ( <80%),
- inc TLC, (#1..first thing you look at, best test restrict vs obstruct)
- dec DLCO, (#2..2nd thing you look at)
- inc RV
Asthma
- dec FEV1,
- dec FEV1/FVC,
- inc TLC,
- normal/increased DLCO, **
- inc RV
Restrictive intrathoracic
- dec FEV1,
- nl FEV1/FVC,
- dec TLC,
- dec DLCO, **
- dec RV **
Restrictive extrathoracic
- dec FEV 1,
- nl FEV1/FVC,
- dec TLC,
- nl DLCO, **
- inc RV **
best test restrictive vs obstructive
TLC
DLCO 140% predicted, normal FEV1/FVC and TLC. most likely finding of …
alveolar hemorrhage
Inc DLCO
CHF, MS, ASD/VSD, PDA, polycythemia, asthma, squatting, exercise, alveolar hemorrhage.
any reason for increased blood to pulmonary vasculature.
Dec DLCO
COPD, restrictive lung dz, PE, PHTN, anemia, standing, valsalva.
anything impeding the flow of blood in thoracic cavity
Normal DLCO
asthma, CO poisoning
Fixed extrathoracic
tumors/tracheal stenosis….. both inspiratory (bottom) and expiratory (top) loops blunted….. confirm w/ bronch
Dynamic extra-thoracic obstruction
epiglottis, Vocal cord dysfxn (inspiratory - bottom loops blunted) … confirm w/ laryngoscopy.
Dynamic intra-thoracic obstruction
intrathoracic tracheomalacia - exhalatory (upper) loop blunted
Asthma
- Paroxysmal
- Inflammatory
- Nonspecific reactive airway disease.
reactive to: dust, viral infection, cold or exercise, occupasional allergens: isocyanates (urethane paint), cotton dust (byssinosis), wood dust (cedar or oak), metal workers.
- usually present with a combination of symptoms.
- chronic cough –> SOB –> wheeze.
If pt has asthmatic symptoms (cough, SOB, wheeze)… what is the next diagnistic step?
PFT’s show –> obstructive changes with reversible broncospasm - responding to bronchodilators by increasing FEV1 by about 12%), then asthma is diagnosed.
- if no obst, but clinical suspicion is high, then methacholine challenge test to provoke bronchospasm and should respond to bronchodilator by about 12% increase in FEV1
Young man h/o asthma acute asthmatic attack treated with albuterol nebs - f/u now PFT will show
Obstructive defect (still has asthma dx)
35yo M paroxysmal non-prod cough >6months - no ohther sx - spirometry normal, no improvement with anti-histamine/cough meds
methacholine challenge test r/o asthma
woman in car factory SOB at work, worse at end of day, better at home, cxr normal
check peak flow at work AND home ** sen but not spec