ECG artifacts are common and include tracings recorded from external ECG machines, bedside and central station monitors, treadmill ECG machines, and ambulatory rhythm monitors such as Holter recordings. ECG artifacts have variable causes and include body motion of or near the skin electrodes, such as scratching over an electrode, circuitry problems, such as inadequate electrode connections or disconnections; and deliberate patient manipulation of the body surface electrodes. Signal processing of exercise ECG is an issue and artifacts are a recurring problem. It is difficult to discriminate the ECG curves from artifacts, especially in exercise ECGs and particularly in the high exercise phase.
Motion artifact, the most prevalent and difficult type of noise to filter in exercise ECG, corrupts the intelligibility of the desired signal thus reducing the reliability of stress test. The patient movement is the catalyst for motion artifact, measuring body movement by means of an accelerometer and using the sensor measurement in an adaptive filtering system to remove or at least minimize the noise reduces the amount of motion artifact in stress ECG.
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