EEG During Gastroscopy and/or Colonoscopy

EEG Analysis During Anesthesia for Day Case Gastroscopy and/or Colonoscopy

Status

Completed

Phases

Unknown

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT07073274

Enrollment

149

Registered

2025-07-18

Start date

2025-07-25

Completion date

2026-02-28

Last updated

2026-03-18

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

Conditions

Endoscopy of Stomach (Procedure), Colonoscopy (Procedure), Continuous Processed Electroencephalogram (Procedure)

Keywords

Anesthesia, EEG, Burst suppression, gastroscopy, colonoscopy

Brief summary

During anesthesia, EEG shows specific and significant changes according to the depth of anesthesia and the drugs used. Endoscopic procedures like gastroscopies or colonoscopies are usually done on an outpatient basis using essentially propofol for sedation or anesthesia. Preliminary reports have shown that the depth of anesthesia during these procedures may be very deep resulting even in a burst suppression pattern on the EEG. In this study, frontal EEG will be recorded continuously using a Root - Sedline device (Masimo, US). Anesthesiologists will be free to use the medications and dosage they judge appropriate. The attending anesthesiologist will be blinded to the EEG. Medications and dosages will be recorded, as well as processed EEG data from the Sedline and the raw EEG. Primary outcome is the % of time spend in specific range of patient state index (PSI 0-10; 10-20; 20-30; 30-40; 40-50; 5-60; 60-70; 70-80; 80-90; 90-100) as well as the % of time spent in burst suppression.

Interventions

DIAGNOSTIC_TESTEEG analysis

All patients will have a continous recording of their EEG during anesthesia

Study design

Allocation

Intervention model

SINGLE_GROUP

Primary purpose

BASIC_SCIENCE

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Inclusion criteria

* Patients undergoing gastroscopy and or colonoscopy in a outpatient setting under sedation or general anesthesia

Exclusion criteria

* Patients \< 18 years * altered renal function, Glomerular filtration rate \< 50 mL/min/m2 * altered hepatic tests, \> 1.5 \* upper normal limit * Any form of hepatic cirrhosis * Presence of oesophageal varices * Any neurological pathology rendering EEG analysis non reliable

Design outcomes

Primary

Measure	Time frame	Description
Burst suppression	90 min	Percentage of time spent in burst suppression
PSI	90 min	Percentage of time spent in each PSI range

Countries

Belgium

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Mar 19, 2026