When should BiPAP/NIV be started in COPD exacerbation with hypercapnic respiratory failure?

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NIV (BiPAP) Indications in COPD Exacerbation: CRITERIA FOR NIV INITIATION (any of the following after 1 hour of medical therapy): 1. pH <7.35 AND pCO2 >45 mmHg (respiratory acidosis) 2. Moderate-severe dyspnea with use of accessory muscles 3. RR >25/min 4. PaO2/FiO2 <200 For your patient: pH 7.29, pCO2 68 = MEETS CRITERIA for NIV NIV SETTINGS: - Mode: Spontaneous/Timed (S/T) - IPAP: Start 10-12 cmH2O, titrate up to 20 cmH2O - EPAP: 4-6 cmH2O - Backup rate: 14-16 breaths/min - FiO2: Titrate to SpO2 88-92% - Reassess ABG at 1-2 hours SUCCESS INDICATORS at 1 hour: - pH improvement toward 7.35 - pCO2 reduction - Reduced RR and WOB - Improved alertness CONTRAINDICATIONS (NIV NOT appropriate): - Unconscious/unable to protect airway (GCS <8) - Facial trauma or burns - Recent upper GI surgery - Copious secretions (can't clear) - Haemodynamic instability - Severe agitation/uncooperative - Vomiting/active upper GI bleed IMPORTANT: Drowsy but rousable (your patient) = borderline; NIV can still be attempted with close monitoring. If deteriorates on NIV or fails at 1-2 hours = proceed to intubation ICU INDICATIONS: pH <7.25 after NIV, worsening neurological status, hemodynamic instability