Pharmacology Dissociative sedation and analgesia described by Robert and Rosebaum in 1971 is: A 5 to 20% N2O B 20 to 30% N2O C 30 to 50% N2O D 50 to 70% N2O 💡 Explanation Dissociative sedation and analgesia described by Robert and Rosebaum in 1971 is: ✓ Correct Answer: D. 50 to 70% N2O