AI Article Synopsis
- ECG signals sent by the South East Coast NHS Ambulance Trust showed distortion similar to that of acute myocardial infarction due to baseline filtering issues.
- The distortion was hard to detect because the calibration pulses were very narrow, complicating signal verification.
- To ensure reliable ECG signal reproduction, it's recommended to record calibration pulses that are 0.3 seconds wide with all ECGs.
Article Abstract
ECG distortion, mimicking changes seen in acute myocardial infarction, occurred in traces transmitted by the South East Coast NHS Ambulance Trust. This was due to low frequency phase nonlinearity produced by baseline filtering. The very narrow calibration pulses made the detection of this distortion difficult. A 1 mV square wave signal revealed the cause. Adequate calibration pulses 0.3 s wide should be recorded with all ECGs, to show that the signal is being reproduced reliably.
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| http://dx.doi.org/10.1080/08990220701523325 | DOI Listing |
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