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ŁukaszWolff,AnnaCysewska-Sobusiak
ECGmoduleforrecording
the
Electrocardiogram
(Fig.
7),
which
is
abioelectricsignalreflectingelectricalcardiacactivity;thissignalmaybeacquired
byatleasttwoelectrodesplacedonthepatientbody(Fig.8).TheECGsignalsare
presentedinagraphicalformonthemonitorscreen.Theelectrocardiogramallows
assessingtheheartrateandrhythm,todetectmyocardiumdamageandto
estimatethesizeofitschambers.However,itisworthnotingthattheECGrecordis
notalwaysreliablecriterionfordiagnosisofthedisease.Sometimes,thoughthe
cardiacdiseaseoccurs,theECGrecordiscorrect.Ontheotherhand,anincorrect
recordmaybesometimesobservedinnormalclinicalstatus.
GSRmoduletorecordchangesinskinresistances(GalvanicSkinResponse),
whichareabletoreflectdifferentemotions(Fig.9).Changesinvaluesofthe
skinresistanceinagiventimearemeasuredwiththesensorsplacedonhandfingers
(Fig.10).
Fig.9.SamplerecordofGSR
Fig.10.ElectrodesusedintheGSRstudies
Pulseoximetermoduletomonitorheartrate,thearterialbloodpulsewaveform,
andthepercentageoxygensaturationSaO2withanoptoelectronicsensorplacedona
handfinger(Fig.11).Thenoninvasivesensorcangiveanelectricalsignalthatis
proportionaltothetransmittedlightintensity,representingpulsatilechangesinthe
arterialbloodvolume.Whatisuniqueinpulseoximetrythatitispossibletosense
theglobaloxygensaturationofhumanbodyarterialbloodbynoninvasive
transilluminationofonlyaperipheraltissuesetwhichallowsustoseea
”representative”arterialbloodinothertissuecomponents[1].Itispossibletoobtain
veryvaluableinformationaboutthecirculatorysystem.
Itshouldbenotedthatthesignalsreceivedfromsensorsenabletheacquisitionof
onlypartoftheinformationabouttheobjectstatus,anditistheresultantoutcome
ofmanyprocessesinvolved.Thebiomedicalsignalsare”difficult”bothduetothe
specificrequirementsrelatedtotheacquisitionmethodsandthepresenceof
numerousartifactssignificantlyinfluencingonfurtherprocessingandtransmission.
