Browsing by Author "Wong, Man-Faï"
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- ItemClinical testing of cellular phone ringing interference with automated external defibrillators.(2006-11-29) Trigano, Alexandre; Blandeau, Olivier; Dale, Christian; Wong, Man-Faï; Wiart, JoeThis study examined cellular phone ringing interference with automated external defibrillators AED
- ItemReliability of electromagnetic filters of cardiac pacemakers tested by cellular telephone ringing.(2005-07-29) Trigano, Alexandre; Blandeau, Olivier; Dale, Christian; Wong, Man-Faï; Wiart, JoeBACKGROUND State of the art cardiac pacemakers are protected against radiofrequency signals Although there have been earlier clinical and in vitro reports of cellular phone interference with implantable devices only a few studies have been performed in recent years The ringing phase of digital GSM or PCS cellular phones includes a brief period of peak radiated power OBJECTIVES This study tested the protection offered by electromagnetic filters of cardiac pacemakers against cellular phone ringing METHODS We performed 330 consecutive tests in 158 patients at the time of routine examination in our pacemaker follow up clinic The programmed parameters remained unchanged before testing During electrocardiographic monitoring 2 single band digital cellular phones consecutively placed over the pacemaker pocket each received a call The phone systems tested were 1 GSM at a maximal power output of 2 W operating on a 900 MHz carrier frequency and 2 PCS at a maximal output of 1 W operating on a 1800 MHz carrier frequency RESULTS Interference was noted in only 5 tests due to interaction by the GSM system with 4 unprotected pacemaker models The GSM test was negative in 12 other tests of identical pulse generator models The overall incidence of interference was 1 5 of tests CONCLUSIONS Interference by cellular phone ringing occurred only with unprotected pacemaker models Standard programming of these unprotected models was associated with a low incidence of interference
- ItemRisk of cellular phone interference with an implantable loop recorder.(2007-02-16) Trigano, Alexandre; Blandeau, Olivier; Dale, Christian; Wong, Man-Faï; Wiart, JoeThis study examined the risk of cellular phone ringing interference with implantable loop recorders ILR The technical manual of ILR warns of potential interference by cellular phone in close proximity to the implanted device corrupting the data stored in memory or causing inappropriate device operation The ringing phase of a digital Global System for Mobile Communication GSM or Personal Communication Services PCS cellular phone includes a brief burst of peak emitted power To obviate the risk of dysfunction in recipients of implanted ILRs the testing was performed with externally applied devices The ILR was positioned in the left parasternal region and the telemetry wand removed after regular programming Digital cellular telephones were placed over the device at a 1 cm distance and calls were placed The phone systems tested were single or dual band receivers The GSM used a maximal power output of 2 W operating on a 900 MHz carrier frequency and the PCS a maximal output of 1 W operating on a 1800 MHz carrier frequency The device activator was used to store the episodes encompassing the tests Sixty nine tests were performed in 45 patients In 61 tests high frequency polymorphic artifacts were visible on manually activated recordings beginning a few seconds before the first audible ringing tone and persisting throughout the ringing phase Cellular phone ringing in close proximity to an externally applied ILR caused bursts of high frequency signals during electrocardiogram monitoring without causing permanent device dysfunction or reprogramming Cellular telephones are a potential source of electrocardiographic artifacts on ILR recordings