An electrocardiogram (ECG) is a tracing, or drawing. produced by an electrocardiograph - a device which records electrical activity in the heart. An ECG can be used for:
* deciding if the heart is performing normally or suffering from abnormalities, for example cardiac arrhythmia-extra or skipped heartbeats
* indicating damage to heart muscle, such as heart attacks, or ischaemia of heart muscle (angina)
* detecting conduction abnormalities: heart blocks and bundle branch blocks (BBB)
* screening for ischaemic heart disease during an exercise tolerance test, often carried out on an exercise bike or treadmill
* providing information on the physical condition of the heart, for example in patients with left ventricular hypertrophy (LVH)
* detecting electrolyte disturbances, for example low plasma potassium levels.
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