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Speaking Valve Cuff Deflation — FRCA Final MCQ

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ModerateIntensive Care MedicineSpeaking Valve Cuff DeflationFRCA Final

A 55-year-old man on ICU has a tracheostomy in situ. He is being weaned from ventilation. During a tracheostomy speaking valve trial (Passy-Muir valve), the patient becomes distressed with SpO2 dropping. What is the most likely cause?

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Correct answer: E — Pneumothorax

A speaking valve (e.g., Passy-Muir valve) is a one-way valve that allows air in through the tracheostomy but directs exhaled air UPWARD through the vocal cords and out through the mouth/nose, enabling speech. The cuff MUST be deflated before placing a speaking valve – if the cuff remains inflated, exhaled air cannot escape (it is blocked from going through the valve and blocked from passing around the cuff), creating a completely closed system leading to air trapping, respiratory distress, barotrauma, and potentially death. This is a critical safety point.

Reference: NTSP/DAS/ICS – 2023 – Tracheostomy guidelines; RCOA – 2023 – ICM module