Dubin Interstital Lung Disease Flashcards
Acute interstitial Pneumonia v. Idiopathic interstitial Fibrosis
Acute - fast onset (within 7 days)
Idiopathic - progression over a year
50yo with increasing DOE over the past year. Clubbing CXR shows diffuse linear opacities. HRCT shows bilateral abnormalities. Abn PFTs.
Idiopathic interstitial Fibrosis
50yo with acute dyspnea. 7 days of dry cough, SOB, fever, malaise. ABG: pH7.30, PaCO2 65, PaO2 55 on 100% O2. CXR - ground glass, septal thickening.
Acute interstitial Pneumonia
Pathogenesis of Drug Induced Pulmonary Injury - name of injury.
- AMIODARONE results in Acute Interstitial Pneumonitis (also, Organizing Pneumonia, ARDS, Hypersensitivity pneumonia)
- Methotrexate results in interstitial fibrosis
Lipid-laden foamy alveolar macrophages are caused by what @ what dose?
Amiodarone, (over 400mg/day)
Loosely formed, noncaseating epithelioid cell granulomas in interstitium indicative of what?
Hypersensitivity pneumonitis
CXR - (centrilobular) focal patchy consolidation or diffuse ground glass appearance
Acute hypersensitivity pneumonitis
Dx and pathogenesis:
Pet shop owner has EPISODIC (every 4wks for past 6mo) coughing attacks, SOB, recurrent fever.
Hypersensitivity pneumonitis: Bird Fancier’s Lung - IgG mediated hypersensitivity due to exposure to feathers and bird droppings.
- episodic
PFTs in Hypersensitivity pneumonitis
FEV1/FVC increased
FVC reduced
35yo dairy farmer, never smoked, presents with wheezing, mild decrease in FEV1, decreased FVC. CXR normal. Labs reveal eosinophilia and clusters of eosinophils in sputum.
Bronchial asthma - IgE and eosinophilia.
- NOT episodic
22yo sheep and turkey farmer. Episodic periods of wheezing, dyspnea, low grade fever of 100F. Serum precipitans with fungus.
Hypersensitivity Pneumonitis: Farmer’s Lung - IgE and IgG, Type 3
- episodic, fever
What do serum precipitans indicate?
Type 3 hypersensitivity reaction.
Thermophilic actinomycetes, think what?
Farmer’s lung
Bilateral infiltrates, think what?
Farmer’s lung
Describe Silo Filler’s lung
Respiratory distress due to nitric oxide in grain filled silos
SANDBLASTER, foundry worker, granite worker
Silicosis
CXR: bilateral Eggshell calcifications.
In what regions?
Silicosis - in hilar and mediastinal regions
75yoM with severe dyspnea for a year. No weightloss, chest pain, cough, or hemoptysis. 50 pack year hx. Foundry worker.
Always do what after this diagnosis? Why?
Silicosis
- ALWAYS administer PPD test because TB is increased by 30(?) in silicosis pts
What is a postive PPD test in silicosis pt?
10+mm
TB is increased by