GBS FVC Intubation Threshold — FRCA Final MCQ

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ModerateIntensive Care MedicineGBS FVC Intubation ThresholdFRCA Final

GBS monitoring: which parameter best predicts need for ventilation?

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Correct answer: E — FVC <20 mL/kg

GBS 20/30/40 rule: FVC <20 mL/kg, MIP <-30 cmH2O, MEP <40 cmH2O. FVC <20 mL/kg best predictor. Don't wait for blood gas deterioration — PaCO2 rises late. Serial FVC q4-6h. Additional: rapid progression, bulbar weakness, bilateral facial palsy.

Reference: NICE – 2023 – GBS; AAGBI – 2023