Reliability of BIS Monitoring in Neurosurgical Patients

Reliability of Bispectral Index for Depth of Anesthesia Monitoring in Neurosurgical Patients

The aim of the study is to assess the reliability of Bispectral Index (BIS Vista , Covidien) in neurosurgical patients . BIS values at Loss of Consciousness (LOC), Post Intubation (PI) and Return of Consciousness (ROC) in neurosurgical patients are compared to those of non-neurosurgical patients, during routine anesthesia procedures.

Inclusion Criteria:

• BIS > 90 at baseline (awake)
• ASA I or II

Exclusion Criteria:

• GSC < 15
• anticipated difficult ventilation and/or intubation
• BMI > 30
• surgical site that does not allow BIS monitoring
• bilateral hearing loss
• not speaking Italian Language