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Interference of 16.7-Hz electromagnetic fields on measured electrocardiogram
Christoph J Schlimp1, Martin Breiteneder, Johannes Seifert
1Department of Anaesthesiology and Critical Care Medicine, Trauma Hospital Klagenfurt, Waidmannsdorferstrasse 35, Klagenfurt, Austria. c.schlimp@gmx.at
Bioelectromagnetics
|April 24, 2007
Summary
Electromagnetic interference (EMI) from 16.7-Hz AC power lines significantly impacts electrocardiogram (ECG) readings. Magnetic induction from these power lines can make ECG diagnosis impossible, especially near railroad tracks.
Area of Science:
- Biomedical Engineering
- Environmental Health
- Cardiology
Background:
- 16.7-Hz AC power lines are common in railway systems.
- Electromagnetic interference (EMI) can affect sensitive medical equipment like electrocardiogram (ECG) devices.
Purpose of the Study:
- To evaluate the extent of EMI from 16.7-Hz AC power lines on human surface ECG.
- To determine the impact of magnetic induction and electric fields on ECG signal quality.
Main Methods:
- Measurements of EMI were taken on a railroad platform, inside a railroad car, and within a voltage transformer substation.
- Correlation between EMI levels (magnetic induction and electric field) and ECG readings was analyzed.
Main Results:
- A direct linear correlation was found between mean EMI and magnetic induction (5.8-21 microT) on a railroad platform.
- EMI levels inside a railroad car were comparable to those on the platform.
- In a substation, EMI occurred only when the ECG device was closer to the power line than the subject.
- Magnetic induction levels rendered proper ECG-rhythm diagnosis impossible.
Conclusions:
- 16.7-Hz AC power line magnetic induction poses a significant risk to ECG diagnostic accuracy.
- Careful consideration of electromagnetic field exposure is necessary in environments with 16.7-Hz AC power lines.
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