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Healthy ECG trace. View of a electrocardiograph (ECG) trace, showing a normal heartbeat. Curled up on top of the ECG is a healthy vitalograph, a measure of lung functioning. In order to take an ECG, electrodes are placed on the chest and attached to an ECG machine. ECG machines monitor electrical impulses made by the heart during each contraction of its muscles and at rest. The resulting trace can be used to detect certain heart disorders through the characteristic patterns they produce. Vitalographs measure the capacity and expiry rate of the lungs. By comparing these figures with standard results the level of lung functioning can be found.
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