The Patient State Index is well balanced for propofol sedation

Area of Science:

• Anesthesiology
• Neuroscience
• Medical Devices

Background:

• The Patient State Index (PSI) from the SEDLine™ monitor assesses sedation depth.
• Increasing propofol sedation use necessitates studies on PSI's efficacy.
• Limited research exists on the relationship between PSI and propofol sedation levels.

Purpose of the Study:

• To evaluate the PSI's ability to identify correct sedation levels during propofol-induced anesthesia.
• To investigate the correlation between PSI and the Modified Observer's Assessment of Alertness/Sedation (MOAA/S) scale during propofol infusion.

Main Methods:

• Twenty patients undergoing anesthesia induction with target-controlled propofol infusion were studied.
• PSI and MOAA/S scale were recorded every 25 seconds; verbal responsiveness loss was defined as MOAA/S ≤ 2.
• Hemodynamic parameters (blood pressure, heart rate, oxygen saturation) were monitored every five minutes.

Main Results:

• A significant difference (p <0.001) was found in PSI values across various sedation depths and alertness levels.
• A strong positive correlation (r =0.87667) was observed between PSI values and decreasing MOAA/S scores.

Conclusions:

• The PSI index demonstrates a strong correlation with the MOAA/S scale.
• PSI effectively distinguishes sedation levels during propofol administration.
• The findings support PSI's utility in monitoring propofol sedation depth.