GE MAC 2000 Service Manual

Also see for MAC 2000: Operator's manual Reference guide Operator's manual

Contents

IntroductionWhen using stainless steel or silver electrodes, a defibrillator discharge current maycause the electrodes to retain a residual charge causing a polarization or DC offsetvoltage. This electrode polarization blocks acquisition of the ECG signal. To avoid thiscondition, if there is a situation where a defibrillation procedure might be necessary,use non-polarizing electrodes (which do not form a DC offset voltage when subjectedto a DC current) such as silver/silver-chloride types.If you use polarizing electrodes, GE Healthcare recommends disconnecting theleadwires from the patient before delivering the shock.Electrode defibrillation recovery is the ability of the electrode to allow the ECG trace toreturn after defibrillation. GE Healthcare recommends using non-polarizing disposableelectrodes with defibrillation recovery ratings as specified in AAMI EC12 5.2.2.4. AAMIEC12 requires that the polarization potential of an electrode pair does not exceed 100mV 5 seconds after a defibrillation discharge.Refer to the supplies and accessories reference guide for this system for a list ofapproved electrodes.Accuracy of Input Signal Reproduction• Overall System Error meets AAMI EC11 3.2.7.1 requirements. Overall System Error isbetween or within ±5% or ±40 μV, whichever is greater.• Frequency Response meets AAMI EC11 3.2.7.2 requirements, using testing methodsA and D. Frequency response is between or within ±10% between 0.67 and 40 Hzand between +0 and -10% for 20 ms, 1.5 mV triangular input.Modulating Effects in Digital SystemsThis device uses digital sampling techniques that may produce some variation inamplitudes of Q, R, and/or S waves from one heart beat to the next, which may beparticularly noticeable in pediatric recordings. If you observe this phenomenon,be aware that the origin of amplitude variations is not entirely physiological. Formeasuring voltages of Q, R, and S waves, GE Healthcare advises using the QRScomplexes with the largest deflection of the particular waves.EMI/EMC/RF Safety InformationThis system is designed and tested to comply with applicable regulations regardingEMC and must be installed and put into service according to the EMC informationstated in the Electromagnetic Compatibility appendix of the Service and/or Operator’smanual. Changes or modifications to this system not expressly approved by GEHealthcare could cause EMC issues with this or other equipment.Before installing or using the device or system, be aware of the proximity of known RFsources, such as the following:• Radio and TV stations• Portable and mobile RF communication devices (cell phones, two-way radios)• X-ray, CT, or MRI devices18 MAC™ 2000 ECG Analysis System 2053535-003C