1) Scan sequence of the waves:

First identify waves; wave of highest amplitude is usually the R wave; T wave consistently follows R wave; P wave should precede R wave.

2) Heart rate & duration of waves & segments:

Bradycardia <60 per min. (normal in athletes)

Tachycardia 100-220 per min. (normal in exercise / stress)

Flutter 220-350 per min.

Fibrillation - not defined by rate; too chaotic

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