Lung Injury Caused By Pharmacologic Agents Flashcards
Most frequent offenders
Chemotherapeutic drugs
Most frequent clinical syndrome
Diffuse interstitial pneumonitis and fibrosis
Risk factors associated with cytotoxic drug therapy
Cumulative dose
Age of patient
Radiation
O2 therapy
Use of other toxic drugs
Criteria for diagnosing drug-induced lung disease
- History of ingestion of drug known to cause lung injury
- Clinical manifestations have been reported to be induced by the drug
- Other causes have been ruled out
- Improvement on discontinuation of drug
- Exacerbation after resuming drug
2 patterns of bleomycin toxicity
- Progressive fibrosis
- Acute hypersensitivity reaction
Severe pneumonitis in adults develops after administration of this amount of bleomycin
283 mg/m2
*less severe if slow IV administration
___ and ___ receiving bleomycin have increased risk for radiation pneumonitis
Pediatric sarcoma
Hodgkin
Pulmonary injury due to bleomycin occurs by:
Direct injury
1. Oxidant injury through production of reactive O2 metabolites and inactivation of antioxidants
2. Induces apoptosis of AEC type II
Immunologic reaction
1. Generates inflammatory mediators
2. Increased collagen synthesis by fibroblasts through TGFb
PFT of bleomycin lung injury
Restrictive (low VC, TLC)
Gas properties of bleomycin lung injury
Reduced DLCO
Reduced arterial O2 saturation
Signs of bleomycin lung injury
DRY HACKING COUGH
Dyspnea
CXR findings of bleomycin lung injury
Diffuse linear densities
Biopsy findings in bleomycin lung injury
Interstitial pneumonitis
Fibrosis
Extensive alveolar damage with hyperplasia of type II cells, mostly subpleural and basilar
Monitoring of bleomycin lung injury
Serial DLCO
Management of bleomycin lung injury
Withdrawal
Supportive
CS in severe toxicity, hypersensitivity reactions, and eosinophilic pneumonitis
Mechanism of cyclophosphamide lung toxicity
- Oxidant and inflammatory
- Immune
Pulmonary reactions in total doses of cyclophosphamide between __ and __
0.15 and 50 g
Chest wall deformity secondary to failure of lung growth during adolescent growth spurt is a striking feature of:
Cyclophosphamide lung toxicity
Herald onset of cyclophosphamide lung toxicity
SUBACUTE DRY COUGH
Dyspnea
PE of cyclophosphamide lung toxicity
Tahcypnea
Diffusely diminished breath sounds
PFT of cyclophosphamide lung toxicity
Restrictive
Hypoxemia