title: Tracking rhythm in long-term EEG recordings using empirical mode calculation.
abstract: A novel algorithm for the detection and tracking of rhythmic patterns in the EEG signal is presented. The algorithm includes the following steps: 1) linear filtering using symmetric impulse response, 2) calculation of the first intrinsic mode of the filter output and 3) calculation of instantaneous frequency and amplitude using the Hilbert transform. The linear filter is adapted according to the instantaneous frequency. The algorithm is shown to perform well in tracking the alpha rhythm (the alpha coma pattern) in critically ill patients sedated with midazolam.
authors.affiliation: Tampere University of Technology, Pori, Finland. tarmo.lipping@tut.fi
authors.forename: Tarmo
authors.initials: T
authors.lastname: Lipping
authors.forename: Andres
authors.initials: A
authors.lastname: Anier
authors.forename: Indrek
authors.initials: I
authors.lastname: Ratsep
authors.forename: Piret
authors.initials: P
authors.lastname: Kleemann
authors.forename: Valdo
authors.initials: V
authors.lastname: Toome
authors.forename: Ville
authors.initials: V
authors.lastname: Jantti
mesh_terms: D000465:Algorithms; D001921:Brain / Q000473:pathology*; D016638:Critical Illness; D004569:Electroencephalography / Q000379:methods*; D006801:Humans; D006993:Hypnotics and Sedatives / Q000494:pharmacology; D008874:Midazolam / Q000494:pharmacology; D015233:Models, Statistical; D008962:Models, Theoretical; D008991:Monitoring, Physiologic / Q000379:methods; D010363:Pattern Recognition, Automated; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D012984:Software
chemical_list: D006993:Hypnotics and Sedatives; D008874:Midazolam