Asthma step-up therapy — when to add LABA vs LAMA vs biologics in uncontrolled asthma?

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Per GINA 2023, here's the step-up strategy for uncontrolled moderate-severe asthma: **Step 3 to Step 4 Escalation (your patient):** Her profile — FeNO 48 ppb (high, ≥50 indicates eosinophilic T2 airway inflammation), blood eosinophils 450/uL, 2 exacerbations/year, FEV1 68% — strongly suggests T2-high eosinophilic asthma. **GINA 2023 Step 4 Options:** 1. **Add LABA:** ICS/LABA fixed-dose combination is the first step-up (e.g., budesonide/formoterol, fluticasone/salmeterol). Evidence is strongest and this should be attempted first. 2. **Add LAMA (tiotropium):** GINA adds LAMA as an add-on at Step 4-5 if ICS/LABA is insufficient. Tiotropium Respimat 5mcg/day is approved for asthma as add-on therapy, especially if also having frequent exacerbations. 3. **Increase ICS dose:** Consider medium-high dose ICS/LABA. **For this patient, should we go straight to biologics?** With FeNO 48 and eos 450/uL — she is a strong biologic candidate, BUT GINA recommends biologics only at Step 5 (after optimizing Steps 1-4). First: - Step up to high-dose ICS/LABA - Add LAMA - Confirm adherence and correct inhaler technique - Then refer for biologic assessment if still uncontrolled **Biologic of choice (if needed):** - **Dupilumab** (anti-IL-4Rα): Best for eos >150-300 ± FeNO ≥25. Effective for T2-high regardless of eos level. - **Mepolizumab/Benralizumab:** Anti-IL-5; ideal for eos ≥300 and frequent exacerbations. - **Tezepelumab:** Broadest coverage, effective even in T2-low asthma. **Practical recommendation:** Step up to ICS/LABA (medium-high dose) first, add LAMA if still uncontrolled in 3 months, then refer for biologic workup given her biomarker profile.