Influence of Intracranial Lesions on Bispectral Index

"Assessment of the Influence of Intracranial Space Occupying Lesions on the Reliability Off Monitoring of the Bispectral Index for Detection of Return of Consciousness."

The purpose of this study is to assess whether BIS values at return of consciousness are different in patients with or without brain tumors.

Inclusion Criteria:

• Patients undergoing elective craniotomy for removal of frontal or frontotemporal brain tumors.
• Control group: Neurosurgical patients without intracranial pathology.

Exclusion Criteria:

• Patient refusal
• Significantly increased intracranial pressure
• Uncontrolled arterial hypertension
• Significant coronary artery disease
• Anticipated difficult airway
• Decreased level of consciousness
• Existing motor weakness dominant arm/hand
• Impaired hearing
• Nausea, vomiting