High frequency electrocardiography in ischaemic heart disease.

Boyle, D; Carson, Peter E.; Hamer, John

doi:10.1136/hrt.28.4.539

Heart

1966

DOI: 10.1136/hrt.28.4.539

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High frequency electrocardiography in ischaemic heart disease.

D Boyle¹,

Peter E. Carson²,

John Hamer³

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Cited by 24 publications

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“…fJ Uk(w,)eiwtdo)0(12) 01 and based on the temporal distribution of the activity of the dipoles, as assumed by Equations 8 and 9: 1(02 2w U(o)e"Odo=0 for kT<t<(k+l)T (13) C91 Thus, visual examination of the filtered signal would reveal a zone of reduced amplitude at a due time.In particular, within the limitations of the considered model, the above calculation demonstrated that local reduction of power in the high-frequency range 150-250 Hz may produce a zone of reduced amplitude in the high-frequency QRS complex. On the other hand, examination of the original nonfiltered signal should also reveal locally reduced amplitude, provided that the power loss is not negligible compared with the total power, which is indeed the case for the mid-frequency range 40-150 Hz.…”

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Spectral analysis of canine epicardial electrogram. Short-term variations in the frequency content induced by myocardial ischemia.

Mor‐Avi

Akselrod

1990

Circulation Research

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Power spectra of epicardial electrograms were studied in 13 anesthetized dogs subjected to occlusion of the left anterior descending coronary artery. Electrograms were obtained from a bipolar electrode placed on the epicardial surface of the left ventricle and recorded before and after coronary occlusion. After digitization, power spectra of the first and every 50th subsequent waveform were evaluated and compared with the power spectrum of the average waveform obtained from the baseline recording. In particular, we examined variations in relative power content in three frequency ranges: 150-250 Hz, previously shown to be directly affected by myocardial ischemia; 40-150 Hz, presumably corresponding to the fine notches and slurs on the body surface QRS; and 2-40 Hz, the low-frequency range. Apart from a mild initial rise during the first 50 heart beats, the power in the high-frequency range gradually decreased, reaching 5% of the control value at wave 500. The power in the mid-frequency range showed a monotonous decrease after the occlusion and reached 16% of the control. The power in the low-frequency range showed a gradual buildup to 140% of the control after 500 heart beats. Therefore, ischemia causes a shift of the high-frequency spectral components of the local electrographic waveform to lower frequencies. Our findings and the fact that body surface ECG is produced by spatial summation of local electric potentials over the different regions of the myocardial tissue may explain two previously described effects of acute myocardial ischemia on the body surface ECG complex. First, local loss of spectral components in the range 150-250 Hz may produce a zone of reduced amplitude within a QRS complex band-pass filtered in this range. Second, displacement of power in the frequency domain may suggest an explanation to the increased incidence of visible notches and slurs on the surface QRS complex, characteristic to various myocardial pathologies.

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confidence: 99%

Spectral analysis of canine epicardial electrogram. Short-term variations in the frequency content induced by myocardial ischemia.

Mor‐Avi

Akselrod

1990

Circulation Research

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Some aspects of the wideband recording of the electrocardiogram

Mor‐Avi¹,

Akselrod²

1990

Clinical Cardiology

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Summary:The physiological mechanisms responsible for the high frequency components of the electrocardiographic signals in different frequency ranges are still unknown. These components have been studied in the frequency domain as well as in the time domain. Numerous clinical and experimental studies have focused upon the incidence and interpretation of high frequency notches and slurs under different conditions in the myocardium. However, the analysis of the high frequency components appeared to be tedious and imprecise, and the interpretation of its results difficult and controversial, and strongly dependent upon empirically determined standards which still require thorough evaluation. Digital methods for processing electrocardiographic signals developed during the last decade have given rise to a variety of fast and reliable approaches for analyzing the information carried by the electrocardiogram. Many researchers have applied such methods to various clinical situations in human studies and to different kinds of interventions in animal studies. These developments prompted us to review research in the field of wideband recording of the electrocardiogram and to briefly discuss some of the aspects that still require elucidation.Key words: frequency response of electrocardiographs, high fidelity ECG, high frequency components, QRS notching and slurring, high frequency content of QRS, digital filtering, morphology of high frequency QRS

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A Method for Electrocardiographic Investigations in Experiments Creating Artificial Ischemia in Experimental Animals

et al. 2019

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High frequency electrocardiography in ischaemic heart disease.

Cited by 24 publications

References 13 publications

Spectral analysis of canine epicardial electrogram. Short-term variations in the frequency content induced by myocardial ischemia.

Spectral analysis of canine epicardial electrogram. Short-term variations in the frequency content induced by myocardial ischemia.

Some aspects of the wideband recording of the electrocardiogram

A Method for Electrocardiographic Investigations in Experiments Creating Artificial Ischemia in Experimental Animals

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