BIS does not predict dreams reported after anaesthesia
P Samuelsson1, L Brudin, R H Sandin
1Department of Anesthesiology and Intensive Care, County Hospital, Kalmar, Sweden. petersa@ltkalmar.se
Acta Anaesthesiologica Scandinavica
|May 15, 2008
Summary
Dreaming during anesthesia is common, occurring in 8% of patients. This study found no link between anesthesia depth, measured by BIS levels, and the occurrence of dreams, suggesting dreaming is unrelated to insufficient anesthesia.
Area of Science:
- Anesthesiology
- Neuroscience
- Sleep Research
Background:
- Dreaming during anesthesia is frequently reported, with prevalence varying widely in prior studies.
- The relationship between anesthesia depth and the phenomenon of intraoperative dreaming remains unclear.
- Concerns exist that dreaming may indicate awareness or insufficient hypnotic action.
Purpose of the Study:
- To investigate the association between Bispectral Index (BIS) levels and the incidence of dreaming during anesthesia.
- To determine if dreaming during anesthesia is indicative of inadequate hypnotic effect or a risk factor for awareness.
Main Methods:
- A cohort of 2653 surgical patients undergoing anesthesia had continuous BIS monitoring.
- Post-operatively, patients were interviewed using Brice guidelines to assess awareness and dreaming.
- Statistical analysis explored correlations between BIS values (mean, and episodes below 40, above 60, above 70) and reported dreaming.
Main Results:
- Dreaming was reported by 8.0% (211/2653) of patients.
- No significant correlation was found between BIS levels and the occurrence of dreaming.
- Patient-specific factors including age, gender, BMI, and anesthetic agents also showed no association with dreaming.
Conclusions:
- Dreaming during anesthesia appears to be a phenomenon independent of anesthetic depth as indicated by BIS.
- High BIS levels do not generally correlate with reported dreaming, suggesting it's not a reliable indicator of insufficient anesthesia.
- Further research may be needed to understand the underlying mechanisms of intraoperative dreaming.
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