Trends of spectral power indices by ranges (SPIR) display the changes in EEG frequency content. They are displayed in the form of color trends with the width corresponding to the spectral index in percentage terms.
SPIR trend with prevailing theta rhythm (5-7 Hz) in a 6-year-old child with neurophysiological immaturity of the brain.
SPIR trend during monitoring in operating room against the background of anesthesia. With the deepening of anesthesia the delta-theta rate increases (brown, red and yellow areas).
The example of cyclic changes in SPIR trend during sleep monitoring. Sleep stages affect the redistribution of EEG rhythms.
The indented SPIR trend of an infant with prevailing low-frequency components in "burst-suppression" pattern.
Monitoring in ICU. Abnormal increase in slow-wave activity is observed.
SPIR trend during functional test conduction in an adult patient. Significant increase in delta-theta waves is observed at hyperventilation functional test.