Last Updated on September 30, 2022 by pg@petergamma.org
An ECG electrode is:
A conductive pad that is attached to the skin to record electrical activity. The data gathered from several electrodes allow for instance the 12 leads of an ECG to be calculated. For instance lead I is calculated using data from the electrodes on both the right and left arm.
An ECG lead is:
A graphical representation of the heart’s electrical activity which is calculated by analysing data from several ECG electrodes.
A Single Channel ECG is:
There is one amplification channel in a single-channel ECG module. These devices usually have a multi-position switch, which can be used to pick the desired lead. With this type of instrument, only one lead at a time can be registered.
Three Channel ECG:
On 3 channel machines, the ECG signals selected by the microprocessor are amplified, filtered and sent further.
Modified from Understanding an ECG:
https://tentabs.in/blogs/news/what-is-channel-ecg-machine-and-what-is-ecg-machine-used-for