How to read an Electrocardiogram (ECG) - Part 6, The ST Segment

The ST segment is the portion of the tracing falling between the QRS complex and the T wave. During this time, the ventricle is contracting, but no electricity is flowing. The ST segment is therefore usually even with the baseline.

The length of the ST segment shortens with increasing heart rate. Abnormality of electrolytes may also affect the ST segment length, however measurement of the length of the ST segment alone is usually not of any clinical use.

Part 1 PQRST Waves

Part 2 ECG Graph Interpretation

Part 3 The P Wave

Part 4 The PR Interval

Part 5, The QRS Complex

Part 6, The ST Segment

Part 7 The T Wave will be posted tomorrow.

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