What BIS target range is commonly maintained to minimize intraoperative awareness?

What BIS target range is commonly maintained to minimize intraoperative awareness?

• A. 60-80
• B. 20-40
• C. 70-90
• D. 40-60

Answer: (D)

BIS monitoring provides a numeric estimate of hypnotic depth to help prevent intraoperative awareness. The target range commonly used to minimize awareness is 40-60. On the BIS scale (0–100), 40–60 reflects adequate hypnosis for most adults undergoing general anesthesia, balancing unconsciousness with safety. Values higher than 60 suggest lighter anesthesia and a greater risk of recall, while values in the 20–40 range indicate very deep anesthesia with potential for hemodynamic instability and delayed emergence. Values around 70–90 correspond to being near awake, not suitable for surgery. Hence, maintaining BIS in 40–60 is the standard approach to minimize intraoperative awareness.

BIS monitoring provides a numeric estimate of hypnotic depth to help prevent intraoperative awareness. The target range commonly used to minimize awareness is 40-60. On the BIS scale (0–100), 40–60 reflects adequate hypnosis for most adults undergoing general anesthesia, balancing unconsciousness with safety. Values higher than 60 suggest lighter anesthesia and a greater risk of recall, while values in the 20–40 range indicate very deep anesthesia with potential for hemodynamic instability and delayed emergence. Values around 70–90 correspond to being near awake, not suitable for surgery. Hence, maintaining BIS in 40–60 is the standard approach to minimize intraoperative awareness.