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Offset potential of commercial ECG electrodes
J M Clochesy1, S Ripich, D Hollowood
1University of Pittsburgh School of Nursing, PA 15261.
Objective:
To determine the offset potential characteristics of commercially available disposable electrocardiograph (ECG) electrodes.
Design:
Descriptive.
Setting:
Laboratory.
Sample:
Four hundred twenty-eight (214 pairs) disposable ECG electrodes representing 11 manufacturers/types.
Outcome Measures:
Direct current offset potential.
Results:
The maximum offset potential for any electrode pair of a given type ranged from 0.2 mV to 21.6 mV. Of the 11 types of electrodes studied, three had a mean offset potential of < 0.1 mV and one type had a mean offset potential of > 1.0 mV.
Conclusions:
Although all of the ECG electrodes studied meet applicable standards, the differences found may be important when measuring biologic signals other than the electrocardiogram.