A 63-year-old woman with metastatic lung adenocarcinoma on dual checkpoint inhibitor and EGFR-targeted therapy presents with 9 days of progressive dry cough and exertional dyspnea, now unable to climb a single flight of stairs without stopping. She was at her baseline performance 10 days ago at routine oncology follow-up. No fever, no rigors, no sick contacts. Stage IV non-small cell lung adenocarcinoma on nivolumab (anti-PD-1) cycle 14 with good partial response, last infusion 11 days ago. Also on osimertinib for EGFR exon 19 deletion. Never-smoker. ECOG 1. Lives with her daughter.
Acute Resuscitation Milestones & Priorities
Clinical phases and key interventions encountered in this emergency module:
Initial Triage & Hypoxemic Respiratory Distress
Grading & Empiric Corticosteroids for Grade 3 irAE Pneumonitis
BAL Results, Steroid Refractoriness, & Escalation Decision
Checkpoint inhibitor pneumonitis must be graded by symptoms AND oxygen requirement: grade 1 (asymptomatic, radiographic only), grade 2 (mild symptoms), grade 3 (SpO2 <90% on room air or hospitalization), grade 4 (life-threatening).
Procalcitonin and blood cultures do NOT exclude PJP, CMV, or fungal infection in immunosuppressed hosts. BAL is mandatory before or early after starting high-dose steroids when feasible.
Permanent discontinuation of the offending checkpoint inhibitor is mandatory for grade ≥3 pneumonitis per NCCN/ASCO. Rechallenge risk of fatal recurrence exceeds 50%.
PJP prophylaxis is required for any patient on ≥20 mg prednisone equivalent ≥4 weeks, regardless of HIV status. Atovaquone is the alternative for sulfa-allergic patients.
Steroid taper over 6-8 weeks is standard for irAE pneumonitis; rapid tapers cause rebound and recurrence.
Concomitant EGFR-TKI (osimertinib) and anti-PD-1 carry additive pneumonitis risk — patients on both warrant heightened surveillance.
Test Your Clinical Reasoning in Real Time
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