At the hospital, I’ve seen ECG lines that are very different despite a similar heart rate. One is « hilly » with clear peaks and hollows. The other one is quite flat with peaks and hollows very close to the centre line.
In: Biology
The different lines you see are different views of the heart. Different things can be seen from different directions, so every line adds additional information to help decode the ECG.
Explaining exactly how to read an ECG is more complex than is possible to explain in ELI5.
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