Key result
Simultaneous reference signal subtraction reduces SAECG line interference without adding noise or altering diagnostic decisions.
Why the study?
Does a line interference subtraction method reduce power line interference in signal-averaged electrocardiography systems without altering diagnostic decisions?
Does a line interference subtraction method reduce power line interference in signal-averaged electrocardiography systems without altering diagnostic decisions?
A novel line interference subtraction method effectively removes power line noise from signal-averaged ECGs without compromising Late Potential diagnostics.
May facilitate cleaner SAECG without diagnostic impact; hypothesis-generating and requires prospective clinical validation.
A method for line interference reduction to be used in signal-averaged electrocardiography (SAECG) systems is proposed and its performance is analyzed. This new method is an adaptation of a previously reported technique for removal of line interference from conventional electrocardiograms. It involves the recording of a line reference signal simultaneous with the lead signals, so that a shifted and scaled version of it can be used to subtract line interference from the leads. It is shown that this line interference subtraction method can reduce line interference effectively and without introducing any additional noise into the ECG signal. It is also shown that Late Potential diagnostic decisions are not altered when this filter is applied. It is recommended that this technique be used in SAECG when line interference is unavoidable.
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Ider et al. (1995) studied this question. Line interference subtraction method was evaluated on Line interference reduction and Late Potential diagnostic decisions. A line interference subtraction method using a simultaneous line reference signal effectively reduces line interference in SAECG without introducing additional noise or altering diagnostic decisions.
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