Question:easy
Which of the following is the most common method used to know the depth of anaesthesia?
Which of the following is the most common method used to know the depth of anaesthesia?
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A processed-EEG number where 45 to 60 is the surgical plane and 100 is awake.
Updated On: Jun 23, 2026
- BIS (Bispectral index)
- Oesophageal contractility
- Depressed responses
- Hypotension
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The Correct Option is A
Solution and Explanation
Step 1: Identify the dedicated, processed-EEG depth monitor that is in routine clinical use.
Step 2: That is the bispectral index. It takes raw EEG data and converts it into a single number that reflects how anaesthetised the brain is.
Step 3: Read the scale to anchor the value: 100 means wide awake, 45 to 60 means an adequate surgical plane, and 0 means an electrically silent cortex.
Step 4: The remaining options are crude or indirect surrogates, so the standard and most widely used method is BIS.
\[\boxed{\text{BIS (Bispectral index)}}\]
Step 2: That is the bispectral index. It takes raw EEG data and converts it into a single number that reflects how anaesthetised the brain is.
Step 3: Read the scale to anchor the value: 100 means wide awake, 45 to 60 means an adequate surgical plane, and 0 means an electrically silent cortex.
Step 4: The remaining options are crude or indirect surrogates, so the standard and most widely used method is BIS.
\[\boxed{\text{BIS (Bispectral index)}}\]
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