PMID: 2099525Nov 1, 1990Paper

50 hz alternating current as a cause of inhibition of monopolar ventricular pacemakers

Revista española de cardiología
R Ruiz GranellV López Merino

Abstract

It is not well established the importance of 50 Hz alternating current (AC) (that supplies most of house appliances) as a source of inappropriate inhibition of today cardiac pacemakers (PM). This problem has been studied in 58 consecutive patients permanently paced (VVI unipolar) for AV block with 27 different PM models from 11 manufacturers. Under ECG monitoring, 50 Hz AC was applied through a pair of electrodes set at both patient's wrists using a battery powered external source, with voltage ranging between 0 and 45 V. Inappropriate inhibition was considered if PM pauses longer than twice the programmed escape interval of the PM were observed during interference. This happened in 46 patients (79.3%), with PM from all 11 manufacturers, with voltages ranging from 3 to 28 V. In each case, inhibition was seen with a narrow voltage window between no interference detection and interference reversion of the PM. Only 3 patients (5.2%) referred perception of electrical current during the study. Three of the patients studied had complained, prior to the study, about dizziness or presyncope related to touching electrical devices and in all of them inappropriate inhibition was observed during interference. We conclude that: 1) it is pos...Continue Reading

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