General anesthesia and/or deep hypnotic state in propofol-based conscious sedation for endoscopy

Area of Science:

• Anesthesiology
• Gastroenterology
• Clinical Monitoring

Background:

• Moderate sedation is the goal for endoscopy, but the actual depth achieved is not well-documented.
• Propofol-based sedation is commonly used, but its depth requires precise monitoring.

Purpose of the Study:

• To assess the incidence and duration of general anesthesia (GA) or deep hypnotic states during propofol-based sedation for endoscopy.
• To identify predictors of and consequences associated with exceeding moderate sedation levels.

Main Methods:

• A prospective cohort study involving 95 patients undergoing same-day bidirectional endoscopy.
• Bispectral Index (BIS) monitoring was used to quantify sedation depth, defining GA as BIS <60 and deep hypnotic state as BIS <40.
• Patient data, including alcohol consumption and age, were collected, and post-procedural outcomes were assessed.

Main Results:

• 88% of patients experienced BIS scores <60 (GA), and 12.6% had scores <40 (deep hypnotic state).
• Significant alcohol use predicted deeper sedation (BIS <40), while younger age predicted lighter GA (BIS <60).
• Patients with BIS <40 reported higher rates of post-procedural dizziness.

Conclusions:

• A significant proportion of patients undergoing endoscopy experience sedation deeper than intended.
• While alcohol use and younger age were associated with deeper sedation, no definitive predictors were identified in multivariate analysis.
• Further research is needed to understand the predictors and consequences of deep sedation and to improve monitoring techniques.