Why the study?
Does a 1 mV square wave calibration signal detect ECG distortion mimicking acute myocardial infarction?
Does a 1 mV square wave calibration signal detect ECG distortion mimicking acute myocardial infarction?
Adequate calibration pulses 0.3 s wide should be recorded with all ECGs to ensure reliable signal reproduction and avoid false acute myocardial infarction patterns.
May avert filter-induced false MI patterns via routine calibration; leaves open optimal baseline filter standards across devices.
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.
No takes yet. Share an insight, caveat, or question.
Tayler et al. (2008) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: