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. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: Anesthesiology. 2014 Nov;121(5):978–989. doi: 10.1097/ALN.0000000000000419

Figure 2. Group level spectrograms, and spectral analysis comparing dexmedetomidine baseline to dexmedetomidine-induced unconsciousness.

Figure 2

A. Group level spectrogram of dexmedetomidine baseline showing absence of power in the spindle frequency band.

B. Group level spectrogram of dexmedetomidine-induced unconsciousness, showing increased power in the delta (1–4 Hz), theta (4–8 Hz) and alpha/spindle frequency bands (8–16 Hz).

C. Power spectra of dexmedetomidine baseline vs. dexmedetomidine-induced unconsciousness. Electroencephalogram power was larger during dexmedetomidine-induced unconsciousness at 0–7.8Hz, and 11.5–16.6 Hz (P < 0.001, TGTS). Electroencephalogram power was lower during dexmedetomidine-induced unconsciousness at 21.2–40 Hz (P < 0.05, TGTS).

Median spectra presented with 95% jackknife confidence intervals. Horizontal solid black line(s) represent frequency ranges at which significant difference existed.

dB: decibel

Hz: hertz

TGTS: two group test spectrum

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