Relation between depolarization and repolarization phases in body surface QRST integral map

Fereniec, M.; Kania, Michał; Stix, Günter; Mroczka, T.; Maniewski, Roman

doi:10.1109/cic.2007.4745516

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…Baseline wander was reduced using the third-degree polynomial method [ 24 ] (with isoelectric levels estimated from the PR intervals). Independent component analysis and cardiac beats averaging in time were applied to reduce motion artifacts [ 23 , 25 ].…”

Section: Methodsmentioning

confidence: 99%

ST-segment changes in high-resolution body surface potential maps measured during exercise to assess myocardial ischemia: a pilot study

Kania¹,

Zaczek²,

Zavala-Fernandez³

et al. 2014

aoms

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IntroductionThe aim of the study was to assess myocardial ischemia by analysis of ST-segment changes in high-resolution body surface potential maps (HR-BSPM) measured at rest and during an exercise stress test.Material and methodsThe study was carried out on a group of 28 patients with stable coronary artery disease and 15 healthy volunteers. The HR-BSPM were measured at rest and during the exercise stress test on a supine ergometer. The workload was increased in stages by 25 W every 2 min, beginning at 50 W. The maps of ST-segment depression (ST60) were calculated from time averaged recordings at rest and at maximal workload.ResultsThe efficiency in detection of myocardial ischemia was higher for HR-BSPM than for standard 12-lead electrocardiography (ECG) when both methods were evaluated by outcomes of coronarography. The sensitivity of HR-BSPM was 82.4% while for the standard 12-lead ECG exercise stress test it was 58.8%. For some patients significant changes in the ST segment were observed at stress HR-BSPM but were not visible in standard 12-lead ECG recorded under the same conditions.ConclusionsObtained high values of sensitivity and specificity in myocardial ischemia detection suggest that maps of ST60 calculated from HR-BSPM can improve detection of patients with ischemic heart disease in comparison to the standard electrocardiographic exercise stress test examinations.

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Section: Methodsmentioning

confidence: 99%

ST-segment changes in high-resolution body surface potential maps measured during exercise to assess myocardial ischemia: a pilot study

Kania¹,

Zaczek²,

Zavala-Fernandez³

et al. 2014

aoms

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“…The high-resolution ECG signals were recorded from 64 leads [9] relatively to a Common Mode Sense (CMS) electrode. The ECG signals were digitized with 4096 Hz sampling frequency and 24 bits amplitude resolution.…”

Section: Methodsmentioning

confidence: 99%

Identification of Ischemic Lesions Based on Difference Integral Maps, Comparison of Several ECG Intervals

Svehlikova¹,

Kania²,

Turzová³

et al. 2009

Measurement Science Review

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Ischemic changes in small areas of myocardium can be detected from difference integral maps computed from body surface potentials measured on the same subject in situations with and without manifestation of ischemia. The proposed method for their detection is the inverse solution with 2 dipoles. Surface potentials were recorded at rest and during stress on 10 patients and 3 healthy subjects. Difference integral maps were computed for 4 intervals of integration of electrocardiographic signal (QRST, QRSU, STT and STU) and their properties and applicability as input data for inverse identification of ischemic lesions were compared. The results showed that better (more reliable) inverse solutions can be obtained from difference integral maps computed either from QRST or from STT interval of integration. The average correlation between these maps was 97%. The use of the end of U wave instead of the end of T wave for interval of integration did not improve the results.

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“…Specifically, the ECG electrode system developed by Fereniec et al . 4 was used (Fig. 2 b), which is an extended version of the Amsterdam leads system.…”

Section: Methodsmentioning

confidence: 99%

“…The 67 active ECG electrodes were placed on the thoracic surface. Specifically, the ECG electrode system developed by Fereniec et al 4. was used (Fig.…”

Section: Methodsmentioning

confidence: 99%

High-Resolution Body Surface Potential Mapping in Exercise Assessment of Ischemic Heart Disease

et al. 2019

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Standard 12-lead ECG exercise testing is commonly used for screening of ischemic heart disease (IHD). We studied if high-resolution body surface potential mapping (HR-BSPM) during exercise offers advantages over current standards in noninvasive evaluation of IHD. This study was carried out on 90 IHD patients and 33 healthy controls. The 67-lead HR-BSPM was recorded at rest and during exercise. Twenty-one ECG parameters including classical ST criteria were compared. The effectiveness of methods was verified based on the results of SPECT and coronary angiography. The most effective parameters in the diagnosis of IHD were: amplitude parameter ΔST60 and δT parameter showing T-wave morphology changes during exercise. The sensitivities/specificities of ΔST60 and δT parameters for the HR-BSPM were 70/69 and 59/62%, while for the standard 12-lead ECG system they were: 63/62 and 59/56%. These results demonstrate the usefulness of HR-BSPM measurements during exercise. HR-BSPM resulted in higher sensitivities and specificities compared to the standard 12-lead exercise test. The advantage was partially associated with observed ischemic changes outside standard precordial leads position that were not visible when using the standard 12-lead exercise test. This justifies research into the optimization of the number and position of ECG leads in exercise testing.

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Relation between depolarization and repolarization phases in body surface QRST integral map

Abstract: The aim of the study was to assess the relations between QRST and STT, QRS integral

Cited by 8 publications

References 11 publications

ST-segment changes in high-resolution body surface potential maps measured during exercise to assess myocardial ischemia: a pilot study

ST-segment changes in high-resolution body surface potential maps measured during exercise to assess myocardial ischemia: a pilot study

Identification of Ischemic Lesions Based on Difference Integral Maps, Comparison of Several ECG Intervals

High-Resolution Body Surface Potential Mapping in Exercise Assessment of Ischemic Heart Disease

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