BIS monitoring Flashcards
BIS uses EEG analysis as a measure of ____
awareness
The numeric values for BIS refer to
LOC
EEG when awake shows ____ amplitude and ____ frequency
low amplitude
high frequency
EEG for the deeply anesthetized pt shows ____ amplitude and _____ frequency
high amplitude
low frequency
Potential benefits of BIS monitoring
- Lower risk of awareness
- More rational selection of CV interventions (in deciding if something is d/t pain or something CV related)
- Better management of response to surgical stimulation
- Faster wake-up and recovery
- More cost-effective use of drugs
Lower BIS value correlates with increasing
hypnosis
Effect of opioids on consciousness
No significant influence on consciousness
Increased in perceived stimulus on BIS leads to
lightening of hypnosis
These factors can alter the BIS number
- Ischemia or severe hypoxia
- Hypothermia
- Artifacts
Pts are at risk for recall as the BIS value climbs towards ____
70
Conscious sedation would fall into this BIS range
70-100
When BIS is below _____, the patient is considered unconscious
- 60
- Lower than 60 is the maintenance range for anesthesia
BIS less than 40 can be caused by
- Deep anesthesia
- High dose opioid anesthesia
- Barbiturate coma
- Profound hypothermia
BIS numbers and their stages
- 100 = Awake
- 70 = Light hypnotic effects
- 60 = Moderate hypnotic effects
- 40 = Deep hypnotic effects
- 0 = EEG Suppression
General anesthesia is considered to be between these values
45-60
