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Patient state index.

David Drover1, H R Ortega

  • 1Department of Anesthesia, H3580, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA 94305-5640, USA. ddrover@stanford.edu

Best Practice & Research. Clinical Anaesthesiology
|April 26, 2006
PubMed
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The Patient State Index (PSI) monitors anesthesia and sedation effects using a 4-channel EEG. This clinically validated measure aids in assessing patient drug effects during surgery and in intensive care.

Area of Science:

  • Neuroscience
  • Anesthesiology
  • Medical Devices

Background:

  • The Patient State Index (PSI) is a validated clinical tool.
  • It measures the impact of anesthesia and sedation on patients.
  • Monitoring patient state is crucial in intra-operative and intensive care settings.

Purpose of the Study:

  • To describe the Patient State Index (PSI) and its underlying technology.
  • To highlight the capabilities of the SEDLine monitor for patient monitoring.
  • To explain the algorithm used for calculating PSI.

Main Methods:

  • Utilizes a high-resolution 4-channel electroencephalograph (EEG) monitor with advanced artifact rejection.
  • Employs a proprietary algorithm analyzing EEG power, frequency, and phase information.

Related Experiment Videos

  • Examines anterior-posterior brain relationships and inter-hemispheric coherence.

    • Main Results:

    • The PSI algorithm provides a measure of anesthesia and sedation effects.
    • The SEDLine monitor (successor to PSA4000) displays bilateral brain function and symmetry.
    • The system allows for data storage and download for future analysis.

    Conclusions:

    • The PSI, calculated by the SEDLine monitor, is a reliable tool for assessing patient sedation and drug effects.
    • The technology offers advanced monitoring capabilities for critical care environments.
    • Bilateral brain monitoring and data logging enhance clinical decision-making.