The following are true of Mendelson's syndrome –
Symptoms of Mendelson's syndrome generally occurs within 30 minutes of aspiration.
Critical pH is 2.5 and critical volume is 25 ml.
Use of corticosteroid is generally not recommended.
Critical volume of aspirate is 50 mls
Critical pH of gastric aspirate is 1.5
Onset of symptoms generally occurs within 30 minutes
Steroids have been shown to improve outcome