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Cardiology Teaching Package

A Beginners Guide to Normal Heart Function, Sinus Rhythm & Common Cardiac Arrhythmias

Bipolar Leads

Well, the 2 leads situated on the right and left wrist (or shoulders), AVr and AVL respectively, and the lead situated on the left ankle (or left lower abdomen) AVf, make up a triangle, known as "Einthoven’s Triangle". Information gathered between these leads is known as "bipolar". It is represented on the ECG as 3 "bipolar" leads. So,

Image: Einthoven’s triangle - Line of site of the bipolar leads

Einthoven’s triangle - Diagram showing the line of site of the bipolar leads

Now we have 12 leads, we need to know which regions of the heart each lead is looking at and what groups they make up.

Regions of the Heart

The ECG below shows where these leads are when printed.

Image: ECG with regions of the heart highlighted

Recreation of an ecg with coresponding regions of the heart highlighted

This diagram is avaible at full size as a Adobe PDF for you to download

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