GE CARESCAPE - Entropy range guidelines; Burst suppression ratio (BSR); Entropy practicalities

Entropy
●Graphicaldisplay:
●Entropyvalues:LowEntropyvalues
●EEG:RegularEEG
●PatientStatus:SuppressedEEG
●Graphicaldisplay:
Entropyrangeguidelines
NOTE
Individualpatientsmayshowdifferentvalues.Theseareonly
guidelines.
RE
SE
Description
10090
Awake
60–4060–40
Lowprobabilityofrecall,clinicallyadequatelevelfor
mostsurgicaloperations
<40<40
Deepanesthesia
00
SuppressedEEG
Burstsuppressionratio(BSR)
BSRisdenedasthepercentageoftimeofsuppressed(isoelectric,atline)EEG
periodsduringthelastminuteofobservation.Emergenceofburstsuppressionpattern
mayindicateverydeepanesthesia,hypothermiaorischemia.
Typically,duringgeneralanesthesia,intheabsenceofrequirementsforprofound
levelsofanesthesia,BSRis0%.Higherlevelsofburstsuppressionindicateverydeep
hypnosis/unconsciousnesslevel.BurstsuppressiongenerallyemergeswithEntropy
valuesbelow40,butmaynotappearevenwithverylowEntropyvalues.
Entropypracticalities
●Itisveryimportanttoensuregoodcontactbetweenthesensorelectrodesandskin.
Withcarefulskinpreparation,correctsensorplacementanduseofcorrectcable,
theskullandsinusesbetweentheelectrodesandthebraininterfereminimally
withthesignalacquisition.Seethesensorinstructionsforuseformoredetailed
information.
●AhighqualityEEGsignalistheprerequisiteforsuccessfulEntropycalculation.
DisplayingtherawEEGwithintheEntropyEEGwaveformadjacenttotheEntropy
valuesmayhelptheusertoconrmthesignalquality.RawEEGonthescreenmay
alsoenablethecliniciantoviewtheEEGforrecognizableandclinicallyrelevant
patternsofEEGactivity.
●DonotuseothersensorsthanEntropysensorsbyGE.
2062971-001CARESCAPEModularMonitors357