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Technical Problems

1 byte added, 00:18, 8 May 2008
Artefacts
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==Artefactsartifacts==[[Image:Noise_move.png|thumb| Movement artefactsartifacts]][[Image:ECG_Parkinson.png|thumb| Increasing movement artefacts artifacts in a Parkinson patient. The patient was in sinus rhythm! (which doesn't show on this short recording)]]
[[Image:BaselineDrift.png|thumb| Baseline drift. The amplifier in the ECG machine has to re-find the 'mean'. This often occurs right after lead connection and after electric cardioversion.]]
[[Image:cardioversion_from_afib.jpg|thumb| Cardioversion from atrial fibrillation to sinusrhythmsinus rhythm, with clear baseline drift.]]
[[Image:electric_noise_ecg.png|thumb| Electrical interference from a nearby electrical appliance. A typical example is a 100 Hz background distortion from fluorescent lights. Not to be confused with [[arrhythmias#atrial fibrillation|atrial fibrillation]].]]
[[Image:electric_noise_ecg2.jpg|thumb| Another example of an artefact caused by an electrical appliance. The patients rhythm is regular. This strip shows 10 QRS complexes.]]
Artefacts artifacts (disturbances) can have many causes. Common causes are:
*Movement
*Electrical interference
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