GE MAC 600 - Recording ECGS of Pacemaker Patients; Accuracy of the Input Signal Reproduction; Modulating Effects in Digital Systems

Introduction
ElectrodedebrillationrecoveryistheabilityoftheelectrodetoallowtheECGtracetoreturn
afterdebrillation.Werecommendusingnon-polarizingdisposableelectrodeswithdebrillation
recoveryratingsasspeciedinAAMIEC124.2.2.4.(MMSP/N9623-105SilverMacTrodes,MMSspec.
TP9623-003).AAMIEC12requiresthatthepolarizationpotentialofanelectrodepairdoesnot
exceed100mV,5secondsafteradebrillationdischarge.
RecordingECGSofPacemakerPatients
WARNING:
PATIENTHAZARDIfseveraladverseconditionsexistatonce,pacerpulsesmightbeinterpreted
andcountedasQRScomplexes.Pacemakerpatientsshouldalwaysbewatchedclosely
Thesystemdoesnotsupportanalogdetectionofpacerpulse.
AccuracyoftheInputSignalReproduction
lOverallSystemErroristestedusingthemethoddescribedinAAMIEC113.2.7.1.OverallSystem
Erroris±5%.
lFrequencyResponseistestedusingthemethoddescribedinAAMIEC113.2.7.2methodsAandD.
ModulatingEffectsinDigitalSystems
Thisdeviceusesdigitalsamplingtechniquesthatmayproducesomevariationinamplitudesof
Q,R,and/orSwavesfromoneheartbeattothenext,whichmaybeparticularlynoticeablein
pediatricrecordings.
Ifthisphenomenonisobserved,theclinicianshouldbeawarethattheoriginofamplitude
variationsisnotentirelyphysiologic.
FormeasuringvoltagesofQ,R,andSwaves,itisadvisabletousetheQRScomplexeswiththe
largestdeectionoftheparticularwaves.
24MAC™6002047426-001K