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Cardiology Teaching Package

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

ST Segment Changes

When the heart muscle is affected by myocardial infarction or ischaemia, the ECG changes that occur concern the ST segment. Below is a sinus complex, or normal heart beat, with the ST segment highlighted.

Image: ST Segment

ST Segment

the above picture shows a normal sinus complex with a normal ST segment flat on the iso-electric line.

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