interstitial lung dz Flashcards
interstitial lung disease is also known as
pulmonary fibrosis
in interstitial lung disease, the lung is affected in what 3 ways
- lung parenchyma is damaged
- walls of alveoli become inflamed
- scarring (fibrosis) begins and lungs become stiff
interstitial lung disease has what primary clinical presentation
- progressive dyspnea on exertion and nonproductive cough
- wheezing and CP are uncommon
PE is consistent with
- crackles at lung bases
- inspriatory squeaks
- cor pulmonale
- cyanosis and digital clubbing (advanced dz)
interstitial lung disease
what abnormal CXR findings are consistent with interstitial lung disease
- ground-glass appearance: often early finding
- bilateral opacities, reticular “net-like” (most common)
- honeycombing indicated poor prognosis
pulmonary function tests reveal that most interstitial lung disease are . TLC will be? FEV1/FVC ratio?
- restrictive
- TLC decreased
- FEV1 and FVC decreased but ratio is normal
contrary to other interstitial lung diseases, sarcoidosis has what pattern on PFT
obstructive
expected diffusing capacity of lung for CO (DLCO) in interstitial lung disease
- reduced
- ability of gas to cross from air -> interstitium -> blood is diminished due to inflammation of alveolar wall
expected ABG in interstitial lung disease
- may be normal
- may show hypoxemia or respiratory alkalosis
- increased RR -> decreased PaCO2
what is bronchoalveolar lavage
- extension of bronchoscopy
- allows for cellular analysis
- may help narrow DDx, define stage of disease, assess progress or response to therapy
what is the gold standard to diagnose interstitial lung disease
lung biopsy
provide indications when lung biopsy is indicated
- atypical or progressive symptoms
- age >50 yo
- fever, weight loss, hemoptysis
- ILD symptoms with normal or atypical CXR
list complications of interstitial lung disease
- pulmonary HTN -> Cor pulmonale (rt ventricular hypertrophy) -> Rt heart failure
- pneumothorax (alveoli become so stiff, they rupture)
- elevated CA risk
- progressive respiratory insufficiency
what is often the initial procedule of choice for lung biopsy
transbronchial lung biopsy
- less invasive, less tissue for analysis
known occupation and environmental causes of interstitial lung disease
- inorganic dust (asbestos, silica, hard metals)
- organic dust (bacteria, animal proteins)
- gases, fumes
known drug cause of interstitial lung disease
- chemo
- abx: macrobid
- radiation treatment
interstitial lung disease is associated with what diseases
- sarcoidosis
- connective tissue or autoimmune
- scleroderma
- SLE
- RA
- polymyositis
- systemic vasculitis (granulomatosis with polyangitis)
what is Pneumoconiosis
- any disease of the respiratory tract due to inhalation of dust particles
- asbestosis, silicosis
when does asbestosis present
- due to chronic inhalation of asbestos fibers
- usually presents 10-15 yrs of exposure
- age 40-75 yo
- m>f