Technical Problems: Difference between revisions

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==Artefacts==
==artifacts==
[[Image:Noise_move.png|thumb| Movement artefacts]]
[[Image:Noise_move.png|thumb| Movement artifacts]]
[[Image:ECG_Parkinson.png|thumb| Increasing movement artefacts in a Parkinson patient. The patient was in sinus rhythm! (which doesn't show on this short recording)]]
[[Image:ECG_Parkinson.png|thumb| Increasing movement 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: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 sinusrhythm, with clear baseline drift.]]
[[Image:cardioversion_from_afib.jpg|thumb| Cardioversion from atrial fibrillation to sinus 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_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.]]
[[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 (disturbances) can have many causes. Common causes are:
artifacts (disturbances) can have many causes. Common causes are:
*Movement  
*Movement  
*Electrical interference
*Electrical interference


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