GE CARESCAPE - Relation of Entropy values to EEG and patient status

Entropy
associatedwithlowprobabilityofconsciousness.AdecreaseinEntropymayenable
thephysiciantoobservethemomentwhenthepatientlosesresponsiveness.During
continuedanesthesia,bothEntropiesstabilize.
DuringgeneralanesthesiawithadequateanesthesiaandhypnosistheREandSE
valueswillbewithinanarrowrangeorequal.Thenumberswillalsomergeduring
profoundneuromuscularparalysiswithneuromuscularblockingagentssincethe
patient’sfacialmusclesareunabletoreact.
REistypicallyhigherduringperiodspriortoinductionandbeforewake-up.Ifthe
numbersdiverge(REexceedsSE)duringgeneralanesthesia,itindicatesthatthefacial
musclesareactivated.Thismayhappenduetonoxiousstimuli.SEvaluemayremain
withinaconstantrangeifthelevelofhypnosisisadequate.AquickriseinREmaygive
anearlywarningofimpendingwake-up.
PatientsemergingfromgeneralanesthesiawilldemonstrateariseinboththeRE
andSEvalues.
RelationofEntropyvaluestoEEGandpatientstatus
●Entropyvalues:HighEntropyvalues
●EEG:IrregularEEG
●PatientStatus:Awake
●Graphicaldisplay:
●Entropyvalues:HighEntropyvalues
●EEG:IrregularEEG
●PatientStatus:Deepeningsedation
●Graphicaldisplay:
●Entropyvalues:LowEntropyvalues
●EEG:RegularEEG
●PatientStatus:Moderateanesthesia
●Graphicaldisplay:
●Entropyvalues:LowEntropyvalues
●EEG:RegularEEG
●PatientStatus:Verydeepanesthesia
356CARESCAPEModularMonitors2062971-001