Effects of dc bias currents on ECG electrodes.
The effects of small dc bias currents on the offset potentials of disposable ECG electrodes (four brands of Ag-AgCl and two brands of stainless steel) were examined. After periods ranging from a few minutes to several days, samples of all electrode types exhibited offset potentials exceeding 200 mV after subjection to dc bias currents over 200 nA. All Ag-AgCl electrodes were able to withstand bias currents of 200 nA with minimal changes in offset for periods up to 7 days. The stainless electrodes exhibited large offset potentials within minutes after subjection to bias currents of only 100 nA.
D002712:Chlorides; D004560:Electricity; D004562:Electrocardiography / Q000295:instrumentation*; D004563:Electrochemistry; D004566:Electrodes; D012834:Silver; D013193:Stainless Steel
D002712:Chlorides; D013193:Stainless Steel; D012834:Silver