Q: What percentage of patients develop post-extubation laryngeal edema?

Answer: Surprisingly, clinically relevant post-extubation laryngeal edema occurs in up to 30% of extubated patients, but only 4% of patients need to be reintubated due to laryngeal edema.

Reference:

Bastiaan HJ Wittekamp, Walther NKA van Mook, Dave HT Tjan, Jan Harm Zwaveling and Dennis CJJ Bergmans -  Clinical review: Post-extubation laryngeal edema and extubation failure in critically ill adult patients - Critical Care 2009, 13:233