Recording Ecgs Of Pacemaker Patients; Accuracy Of The Input Signal Reproduction; Modulating Effects In Digital Systems - GE MAC 600 Operator's Manual

Introduction
Electrode defibrillation recovery is the ability of the electrode to allow the ECG trace to return
after defibrillation. We recommend using non-polarizing disposable electrodes with defibrillation
recovery ratings as specified in AAMI EC12 4.2.2.4. (MMS P/N 9623-105 Silver MacTrodes, MMS spec.
TP9623-003). AAMI EC12 requires that the polarization potential of an electrode pair does not
exceed 100mV, 5 seconds after a defibrillation discharge.

Recording ECGS of Pacemaker Patients

WARNING
PATIENT HAZARD If several adverse conditions exist at once, pacer pulses might be interpreted
and counted as QRS complexes. Pacemaker patients should always be watched closely
The system does not support analog detection of pacer pulse.

Accuracy of the Input Signal Reproduction

Overall System Error is tested using the method described in AAMI EC11 3.2.7.1. Overall System
l
Error is ± 5%.
Frequency Response is tested using the method described in AAMI EC11 3.2.7.2 methods A and D.
l

Modulating Effects in Digital Systems

This device uses digital sampling techniques that may produce some variation in amplitudes of
Q, R, and/or S waves from one heart beat to the next, which may be particularly noticeable in
pediatric recordings.
If this phenomenon is observed, the clinician should be aware that the origin of amplitude
variations is not entirely physiologic.
For measuring voltages of Q, R, and S waves, it is advisable to use the QRS complexes with the
largest deflection of the particular waves.
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MAC™ 600 2047426-001K