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What is an ECG?
How ScanWatch 2 obtains an ECG:
- ECG, or electrocardiogram, is the graphical rep-
resentation of the electrical activity of the heart. It can
detect certain cardiovascular pathologies.
- With each heartbeat, an electrical wave travels
through your heart. This wave causes your heart to
contract and pump blood.
- In a doctor's office, a standard 12-lead ECG is usu-
ally taken. This 12-lead ECG records electrical signals
from different angles in the heart to produce twelve
different waveforms. ScanWatch 2 measures a wave-
form similar to one of those twelve waveforms. This
configuration is known as single-lead ECG.
- A single-lead ECG is able to provide information
about heart rate and heart rhythm and enables clas-
sification of Atrial Fibrillation (AFib). However, a sin-
gle-lead ECG cannot be used to identify some other
conditions, like heart attacks. Single-lead ECGs are of-
ten prescribed by doctors for people to wear at home
or within the hospital so that the doctor can get a bet-
ter look at the underlying rate and rhythm of the heart.
Taking an ECG
How to take an ECG recording:
- Make sure your ScanWatch 2 is snug on the wrist that
you selected in the companion app to be your measure-
ment wrist. You can modify your measurement wrist in the
companion app, in Devices > ScanWatch > More Settings
> Device Orientation.
- Rest your arms on a table, and hold the top electrode
with your other hand (as shown in Fig. 1).
You do not need to press the bezel during the session.
Fig. 1 - How to place the second hand to get an ECG
measurement
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