Reading those results is something of an art, because, by practicality (originally) and tradition (today, even though the possibility of digital signal processing now exists), ECG signals are simply displayed as separate time-domain traces on the ECG display or printout. By looking at the differential signals across different sets of locations, a physician gains the insights to assess heart functionality from multiple viewing angles. They can be picked up at many points on the body, but decades of medical tradition have standardized the accepted locations of those points. Low Voltages And Sources Of InterferenceĪn ECG detects and displays the electrical pulses, with amplitudes of a few millivolts, that are associated with heartbeats.Don’t Confuse Wire Leads With Display “Leads”.A description of the electronics in an electrocardiograph and what signals they measure to produce the “leads” on an ECG strip chart or video display.
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