What is defined as recovery index of the neuromuscular blocker (NMB):-: (A) It is time interval between 25% and 75% twitch height of the NMB, (B) It is time interval between 25% and 50% twitch height of the NMB, (C) It is time interval between 50% and 75% twitch height of the NMB, (D) It is time interval to reach 100% of twitch height of the NMB
Answer is A. Duration of action is the time from injection of the neuromuscular blocking agent to return of 25% twitch height. Recovery index is the time interval between 25% and 75% twitch height.