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Related Experiment Videos

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
PubMed
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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.

Related Experiment Videos

  • 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.