SummaryFibreoptic intubation remains a key technique for the management of difficult intubation. We randomly compared the second generation single-use Ambu

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increase, 0.24 kPa). There was no significant increase in EtCO 2 with increased BMI (P>0.05).Our extensive dataset demonstrates that HFJV is safe and effective in elective laryngotracheal surgery. As expected, significant desaturation increases with increased operative length and increased BMI. Hypercapnoea was not an issue, and perhaps unexpectedly was not affected by BMI. Care should be exercised ventilating a male patient BMI >35 where there is an increased probability of desaturation.