[Standard test signal for the sensitivity of cardiac pacemakers].
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Biomedical subjects
Publications and source records attributed to M S Lampadius.
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To prolong the expected lifetime of pacemakers, more and more pulse generators with reduced output and electrodes with high impedance are used nowadays. Therefore it becomes necessary to measure carefully the physiological parameters as threshold, intracradial potential or the electrode-myocard impedance. When evaluating the threshold it is important to know the output properties of the pacemaker to be used and to take into consideration that the pacemaker itself also will influence the size of the intracardial potential. As no reliable data about the longevity of pacemaker electrodes is available, the total electrode impedance should be measured. Thus at least insulation defects can be detected and impending pacemaker failure be avoided. To observe long term changes in those parameters it is advisable to keep a comprehensive implantation protocol.
Pacemakers may be influenced by a variety of external methods such as a magnet to test the stimulation threshold or a special programmer to change the pacers output or rate. This designed influence must not be confused with electromagnetic interference on pacemakers. The paper differenciates between functional and faulty behavior of pacemakers. A case report shows the influence of EMI by electrical devices. It is recommended to undertake field tests if EMI is likely to occur under special occupational conditions.
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