Monitoring Anesthetic Brain States - The Spectral Analysis of the EEG

The Spectral Analysis of the EEG

A segment of EEG can be decomposed into a plot of its power (usually in dB) as a function of frequency. This plot is termed the power spectrum. Because the spectrum captures only one instance in time it has limited utility during a dynamic anesthetic state (Fig. 11.3).

3D spectrogram

Taking the spectrum plots at several adjacent time intervals and stacking them together forms a 3D spectrogram. The spectrogram is a plot of power by frequency as a function of time.

  1. Red = high power, blue = low power.
  2. The 3D spectrogram can be flattened into to a 2D plot which is displayed on monitors in the operating room (Fig. 11.4). The 2D spectrogram plot is also termed the density spectral array. The 3D spectrogram is also termed the compressed spectral array.

Figures

Outline

Monitoring Anesthetic Brain States - The Spectral Analysis of the EEG is a sample topic from the Clinical Anesthesia Procedures.

To view other topics, please or purchase a subscription.

Anesthesia Central is an all-in-one web and mobile solution for treating patients before, during, and after surgery. This collection of drug, procedures and test information is derived from Davis’s Drug, MGH Clinical Anesthesia Procedures, Pocket Guide to Diagnostic Tests, and MEDLINE Journals. Learn more.

Citation

* When formatting your citation, note that all book, journal, and database titles should be italicized* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Monitoring Anesthetic Brain States - The Spectral Analysis of the EEG ID - 728460 Y1 - 2019 PB - Clinical Anesthesia Procedures UR - https://anesth.unboundmedicine.com/anesthesia/view/ClinicalAnesthesiaProcedures/728460/all/Monitoring_Anesthetic_Brain_States___The_Spectral_Analysis_of_the_EEG ER -