Anaesthesia The following are true of Mendelson’s syndrome – A Critical volume of aspirate is 50 mls B Critical pH of gastric aspirate is 1.5 C Onset of symptoms generally occurs within 30 minutes D Steroids have been shown to improve outcome 💡 Explanation The following are true of Mendelson's syndrome – ✓ Correct Answer: C. Onset of symptoms generally occurs within 30 minutes