Spectral edge frequency

The Spectral Edge Frequency or SEF is a popular measure used in EEG-monitoring. It is usually expressed as "SEF x", which stands for the spontaneous EEG frequency below which x percent of the power are located. Typically x is in the range 75 to 95. SEF has variously been used to estimate the depth of anesthesia.

See also

• Bispectral index

References

• Drummond JC, Brann CA, Perkins DE, Wolfe DE: A comparison of median frequency, spectral edge frequency, a frequency band power ratio, total power, and dominance shift in the determination of depth of anesthesia, Acta Anaesthesiol Scand. 1991 Nov;35(8):693-9.