ECG: 01. Normal Sinus Rhythm - with Video

This is the cardiac rhythm seen in normal individuals, produced by the sinoatrial node at a normal rate and conducted normally through the conduction system.

This is how it appears in a cardiac monitor:


How do we confirm that this is normal sinus rhythm?
Look for these features
1. Upright P wave seen in lead II (all cardiac monitors display lead II by default)
2. Each P wave is followed by a QRS complex
3. Rate between 60 and 100 beats per minute (with <10% variation)

Here is a schematic representation of normal sinus rhythm showing standard waves, segments, and intervals:

Hi,

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