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An electrocardiogram can be used in diagnosis of cardiac issues. Timing of the ECG and the intervals can give us information about the heart.

A longer P-Q interval, for example, can be caused by AV block, which is where there is a block in impulse transmission from the atria to the ventricles.

A broader QRS complex can be caused by bundle branch block

An elevated ST segment can indicate myocardial infarction (known as ST-Segment  Elevation Myocardial Infarction).

Long Q-T syndrome is a genetic mutation that alters ion channels and manifests in teenage years.

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An elevated ST as observed in myocardial infarction.

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The area of the loop is stroke 'work', and the length is stroke volume. The contractile cycle and values determine where the blood is going at any one time.