Neurological System Monitors

Question 1

BIS Monitoring

Answer 1

bispectral analysis

data measured by EEG (electroencephalogram) are taken through a number of steps to calculate a single number that correlates with depth of anesthesia/hypnosis

Question 2

BIS Values

Answer 2

100 = awake, memory intact

65-85 = a measure of sedation

40-65 = recommended for GENERAL anesthesia; deep hynosis, memory function lost

<40 = Near suppression; increasing burst suppression

0 = cortical silence

BIS analysis may reduce patient awareness during anesthesia

Question 3

Brice Questions

Answer 3

use these questions on postop visits to alert anesthesia providers of potential awareness events:

1. What do you remember before going to sleep?
2. What do you remember right when awakening?
3. Do you remember anything in between going to sleep and awakening?
4. Did you have any dreams while asleep?