Withings ScanWatch Series Installation And Operating Instructions Manual page 60

The gold standard ECG records 12 lead (or ways) of the heart. Withings ECG
devices sense the electrical activity of the heart at a distance through the left and
right arm. This configuration is known as lead D1.
What practitioners look for in the ECG graph?
A normal heartbeat on the ECG graph will show the time the electric wave takes
to move through your heart. There are 3 distinct patterns:
First wave: The "P wave"
The graph shows a first electric wave as electricity moves into the right and left
upper chambers of your heart.
Next wave: the "QRS Complex"
This second pattern shows electricity moving through the right and left bottom
ventricles.
Final wave: the "T wave"
The final wave represents electrical recovery or returns to a resting state for the
ventricles.
ScanWatch
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v1.0 | August, 2020