ECG complex

The time between each ECG complex was used to calculate a representative inter-spike-interval.

In the superimposed median beat method, a median ECG complex is constructed for each of the 12 leads.

Severe hyperkalemia results in a widening of the QRS complex, and the ECG complex can evolve to a sinusoidal shape.

To remove ECG noise, an ECG template was constructed by averaging ECG complexes recorded when muscles were relaxed.

In electrocardiography, fiducial points are landmarks on the ECG complex such as the isoelectric line (PQ junction), and onset of individual waves such as PQRST.

The data are uploaded into a computer which then automatically analyzes the input, counting ECG complexes, calculating summary statistics such as average heart rate, minimum and maximum heart rate, and finding candidate areas in the recording worthy of further study by the technician.

The most practical way of using this is by arranging extremity leads according to the Cabrera system, reversing polarity of lead aVL and presenting ECG complexes in the order (aVL, I, -aVR, II, aVF, III).