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P – Contraction of atria
Q – Initial depolarization of the interventricular septum
R – Early depolarization of the ventricles
S – Late depolarization of the ventricles
T – Repolarization of the ventricles
U – Often hidden by the T wave – this wave has an
unknown origin
The graph in the previous page represents one complete
heart beat from depolarization of the Sinoatrial Node to
repolarization of the ventricles.
The following graph is from a NeuLog ECG experiment.
V2018.01
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