<prompt> The following are true of Mendelsons syndromeCritical volume of aspirate is 50 mlsCritical pH of gastric aspirate is 1.5Onset of symptoms generally occurs within 30 minutesSteroids have been shown to improve outcome  <response>: Symptoms of Mendelsons 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. 