Unusual response of demand pacemakers to magnets.
نویسندگان
چکیده
منابع مشابه
Unusual response of demand pacemakers to magnets.
Most contemporary demand pacemakers contain a magnetic reed switch easily actuated by the application of an external magnet over the pulse generator. This report describes the unusual response of two implanted pulse generators to the testing magnet. The magnetic reed switch of one pulse generator was found to 'stick' in the open position making it impossible to revert the pulse generator to its...
متن کاملTemporary inhibition of permanently implanted demand pacemakers.
Temporary inhibition of permanently implanted demand pacemakers has been previously described. Demand pacemakers may be inhibited by waving a magnet over the region of the pacemaker generator or by chest wall stimulation. The former may not inhibit most of the bipolar pacemakers, whereas the latter may be time consuming and may casue patient discomfort. Another method is described which utilize...
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Of 44 patients with demand pacemakers, 33 had pacemaker rhythm and were examined for failure in pacemaker function produced by myopotentials. Most patients were subjected to a standard experimental programme, with simultaneous recording of electrocardiogram and electromyogram. In 28 of the 33 patients the pacemaker was inhibited by muscle potentials. Three patients had suffered symptoms which c...
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Ventricular inhibited cardiac pacemakers were suppressed by intimate contact of the tip of the active pacemaker electrode with that of the inactive pacemaker electrode in two patients. This contact apparently was sensed as myocardial electrical activity and resulted in variable suppression of pacemaker emission. There was no interference with R-wave sensing function. The threshold for stimulati...
متن کاملInhibition of demand pacemakers caused by potentials associated with inspiration.
A 69-year-old man with a permanent demand pacemaker and a unipolar electrode system had intermittent failure of pacing during deep inspiration. Pacing was not interrupted when the unit was switched to fixed rate mode by an external magnet. Thus, the problem was not caused by a change in electrode position or to a loose connexion. The likely cause was inhibition by non-cardiac potentials, possib...
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ژورنال
عنوان ژورنال: Heart
سال: 1973
ISSN: 1355-6037
DOI: 10.1136/hrt.35.4.353