At supra MAC concentrations, anesthetics lead to shift of EEC wave from-

Ans. d. 0 to a waves In the anaesthetized subject, depression of thalamic gates together with diminished activation of the coex by the ascending reticular activating system (ARAS) will be indicated by a progressive slowing of the EEG, in which the underlying electrical signal will change from low-voltage fast-wave to high-voltage slow-wave pattern. When quantitative EEG (OEEG) variables are applied, anaesthetic-related EEG slowing is associated with an increase in total power, an increase in relativepower in the o and frequency bands concomitant with a decrease in a and fi power. and a decrease in both median frequency (ME) and spectral edge frequency (SEF). Changes from deeper to lighter levels of anaesthetic depth will be indicated by a shift in EEG power from the lower (o, 0) to the higher (a, II) frequency range and by a numerical increase in MF and SEE"- Otto. K.EEG power spectrum Effects of Anesthetics on EEG In the anaesthetized subject, depression of thalamic gates together with diminished activation of the coex by the ascending reticular activating system (ARAS) will be indicated by a progressive slowing of the EEG, in which the underlying electrical signal will change from low-voltage fast-wave to high-voltage slow-wave pattern. When quantitative EEG (QEEG) variables are applied, anaesthetic-related EEG slowing is associated with an increase in total power, an increase in relative power in the 5 and 0 frequency bands concomitant with a decrease in a and p power, and a decrease in both median frequency (MF) and spectral edge frequency (SEF). Changes from deeper to lighter levels of anaesthetic depth will be indicated by a shift in EEG power from the lower (8, 0) to the higher (a, (3) frequency range and by a numerical increase in MF and SEF