The Influence of Age on EEG Signals and Consciousness During Anesthesia

Inclusion Criteria

A potential subject may be included for participation in the study if the subject has/is:

• ≥18 years of age
• American Society of Anesthesiologists (ASA) physical status I-III
• Able and willing to participate in the study and sign the informed consent form
• Will undergo non-ambulatory elective surgery under general anesthesia
• Has an expected surgery time >2 hours

Exclusion Criteria

A potential subject will be excluded from participating in the study if the subject has/is:

• Pregnant
• Unwilling to undergo EEG measurement
• Undergone brain surgery procedure or had a cerebrovascular accident or severe head trauma in the last 10 years
• Alcohol or illicit drug use, which prevents normal functioning in society or has led to organ toxicity. Chronic use of opioids, narcotics, or analgesics, which may limit a subject's responsiveness to analgesic dosages.
• Known or suspected electroencephalograph abnormality (e.g., epilepsy or scarring)
• Presence of a major psychiatric condition such as Bipolar disorder/ schizophrenia/ Alzheimer's disease/ dementia/ Parkinson's disease /major depression
• Severe visual or auditory disorder
• Cannot understand or is unwilling to perform the study assessments, according to the investigator's judgment