Management of Pneumonitis
Diagnosis and Treatment
- The management of pneumonitis fundamentally depends on distinguishing between infectious pneumonia, drug-related pneumonitis (DRP), and hypersensitivity pneumonitis (HP), as each requires distinctly different therapeutic approaches 1
- Immediately discontinue the offending drug and initiate corticosteroids for moderate-to-severe cases (National Cancer Institute grade 2-4) of DRP, as delayed diagnosis leads to irreversible fibrosis and worse outcomes 1
- For grade 2 DRP, discontinue the drug permanently, start prednisone 0.5-1 mg/kg/day, and provide supplemental oxygen to maintain SpO2 >92% 1
- For grade 3-4 DRP, permanently discontinue the drug, hospitalize immediately, administer high-dose IV methylprednisolone 1-2 mg/kg/day, and provide supplemental oxygen or mechanical ventilation as needed 1
- All major oncology societies recommend discontinuing ICI therapy for ANY grade of pneumonitis 1
- The American Thoracic Society and other major societies recommend maintaining PaO2 >8 kPa and SpO2 >92% in patients with community-acquired pneumonia 2, 3
- In COPD patients with pneumonia, use controlled oxygen guided by repeated arterial blood gases to avoid hypercapnia 5
- Assess for volume depletion and administer IV fluids as needed in patients with community-acquired pneumonia 2, 3
- Monitor temperature, respiratory rate, pulse, BP, mental status, and oxygen saturation at least twice daily in patients with community-acquired pneumonia 2, 3, 5
- The Infectious Diseases Society of America recommends a minimum of 5 days of antibiotic treatment for community-acquired pneumonia, with treatment duration not exceeding 8 days in responding patients 4
- Reassess patients at 48-72 hours, and consider bronchoscopy for retained secretions, culture samples, or persistent symptoms at 6 weeks 2, 3
- Preexisting ILD increases DRP risk 4.8-25.3 fold, and these patients require heightened surveillance 1
- Arrange clinical review at 6 weeks with repeat chest radiograph for high-risk patients (smokers, age >50, persistent symptoms) 2, 3, 4, 6