Feedback control alone cannot avoid {HEAD ~ large fluctuations} in {TAIL ~ BIS values} when significant surgical stimulation is imposed, as a result of time delays in a patients response to drug infusion 
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Feedback control alone can not avoid { HEAD ~ large fluctuations } in { TAIL ~ BIS values } when significant surgical stimulation is imposed , as a result of time delays in a patients response to drug infusion
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH