ECG: the first step

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The cardiac vector "LOOP"

The cardiac vector LOOP is the temporal trajectory of the cardiac vector. The temporal trajectory of the component size of the cardiac vector loop in the direction of the lead (namely, the temporal trajectory of the electrocardiograph needle deflection), is the ECG waveform.

After the cardiac vector appears, it changes in size and direction over time before it disappears. Let's call this temporal trajectory "the cardiac vector LOOP". In the previous step, we studied the deflection of the electrocardiograph needle. Then what is the waveform of the ECG? The temporal trajectory of the component size of the cardiac vector LOOP in the direction of the lead (namely, the temporal trajectory of the deflection of the electrocardiograph needle), is the ECG waveform.