Bispectral Index (BIS) Values Required for an Adequate Depth of Anesthesia in Elderly Patients Using Propofol

Bispectral Index (BIS) Values Required for an Adequate Depth of Anesthesia in Elderly Patients Using Propofol, According to the Characteristic Electroencephalographic Pattern

Status

Terminated

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT03195530

Enrollment

Registered

2017-06-22

Start date

2017-05-01

Completion date

2018-03-31

Last updated

2018-04-11

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Anesthesia

Brief summary

A correlation between the bispectral index values and electroencephalographic patterns at the loss of consciousness (LOC) when using propofol in elderly patients, has not been determined. Our aim is to describe the BIS values and the power of the alpha band in the electroencephalography in elderly patients, at the LOC moment.

Detailed description

Propofol is an anesthetic drug regularly used in elderly patients requiring anesthesia. The electroencephalographic pattern recognized when propofol is administered, is different to the pattern obtained in younger patients. Both groups presents an alpha and slow bands, but they differ in the intensity of the signal. Younger patients presents more intense electroencephalographic bands than older patients. Bispectral index (BIS) is a clinical indicator used to evaluate the depth of anesthesia. A correlation between this indicator and the power of electroencephalographic bands has not been determined. We will describe the LOC moment of elderly patients receiving propofol as anesthetic for general surgery, with the EEG characteristic bands and the BIS value obtained at that moment. The BIS values related to the EEG characteristic bands can be described, to correlate the actual indicators of depth of anesthesia with new parameters.

Interventions

DRUGPropofol

Induction of anesthesia using propofol, and recording the BIS values and EEG patterns during the induction

Study design

Observational model

COHORT

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

65 Years to No maximum

Healthy volunteers

Inclusion criteria

* Patients over 65 years * Scheduled for elective surgery requiring general anesthesia * American Society of Anesthesiology (ASA) Score I or II

Exclusion criteria

* Patients with neurological diseases * Requiring the use of two or more drugs affecting Central nervous system * History of drugs or alcohol abuse * Body mass index over 35 kg/m\^2 * Propofol allergy * Cardiac congestive failure * History of coronary syndrome * Minimental test altered (Score under 24 points)

Design outcomes

Primary

Measure	Time frame	Description
BIS values at which EEG patterns (Slow and alpha bands) appears in elderly population using propofol	Induction of anesthesia	To describe the BIS values correlated to specific EEG patterns

Secondary

Measure	Time frame	Description
Propofol concentration required to observe specific EEG patterns	Induction of anesthesia	To describe the serum propofol concentrations required for induction of anesthesia, to observe alpha and slow bands at the EEG.

Countries

Chile

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026