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Post-Extubation Respiratory Support — FRCA Final MCQ

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ModerateIntensive Care MedicinePost-Extubation Respiratory SupportFRCA Final

A 55-year-old man has received invasive mechanical ventilation for 3 days for community-acquired pneumonia, which is improving. This is his first weaning attempt. He is awake, obeys commands, has a strong cough and scant secretions, and requires no vasopressor support. He has no chronic cardiac or respiratory disease, his BMI is 25 kg m⁻² and his APACHE II score is 9. At the end of a successful 30-minute spontaneous breathing trial, his respiratory rate is stable, his rapid shallow breathing index is 65 breaths min⁻¹ L⁻¹ and his SpO₂ is 96%. Arterial blood gas analysis on FIO₂ 0.4 and PEEP 8 cmH₂O shows pH 7.35, PaCO₂ 5.5 kPa, PaO₂ 9.0 kPa and bicarbonate 22 mmol L⁻¹. What is the most appropriate next step?

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Correct answer: A — Extubate to high-flow nasal oxygen

The correct answer is A. The pneumonia is improving, and he has passed a spontaneous breathing trial with stable physiology. He is awake, can protect and clear his airway, and has adequate oxygenation for extubation: PaO₂/FIO₂ = 9/0.4 = 22.5 kPa (approximately 169 mmHg). His age, simple first wean, low APACHE II score, short ventilation duration and absence of chronic cardiac or respiratory disease place him at relatively low risk of extubation failure. ERS guidance suggests HFNO rather than conventional oxygen in low-risk non-surgical patients after extubation. HFNO provides reliable FIO₂, humidification, dead-space washout and a modest flow-dependent positive airway pressure. Room air is inappropriate given his continuing oxygen requirement. Prolonged ventilation adds avoidable complications after a successful assessment. Tracheostomy is premature. Prophylactic NIV is preferentially used in high-risk or hypercapnic patients, neither of which applies here.

Reference: Oczkowski S et al. ERS clinical practice guidelines: high-flow nasal cannula in acute respiratory failure. Post-extubation recommendations. European Respiratory Journal, 2022. https://pubmed.ncbi.nlm.nih.gov/34649974/