Electrodynamic Heart Model Construction and ECG Simulation

2006 ◽  
Vol 45 (05) ◽  
pp. 564-573 ◽  
Author(s):  
M. Huo ◽  
Q. Wei ◽  
F. Liu ◽  
S. Crozier ◽  
L. Xia
Keyword(s):  
Myocardial Ischemia ◽  
Body Surface ◽  
The Body ◽  
Heart Model ◽  
Surface Potentials ◽  
T Wave ◽  
Torso Model ◽  
St Segment ◽  
Surface Ecg ◽  
Cardiac Excitation

Summary Objectives: In this paper, we present a unified electrodynamic heart model that permits simulations of the body surface potentials generated by the heart in motion. The inclusion of motion in the heart model significantly improves the accuracy of the simulated body surface potentials and therefore also the 12-lead ECG. Methods: The key step is to construct an electromechanical heart model. The cardiac excitation propagation is simulated by an electrical heart model, and the resulting cardiac active forces are used to calculate the ventricular wall motion based on a mechanical model. The source-field point relative position changes during heart systole and diastole. These can be obtained, and then used to calculate body surface ECG based on the electrical heart-torso model. Results: An electromechanical biventricular heart model is constructed and a standard 12-lead ECG is simulated. Compared with a simulated ECG based on the static electrical heart model, the simulated ECG based on the dynamic heart model is more accordant with a clinically recorded ECG, especially for the ST segment and T wave of a V1-V6 lead ECG. For slight-degree myocardial ischemia ECG simulation, the ST segment and T wave changes can be observed from the simulated ECG based on a dynamic heart model, while the ST segment and T wave of simulated ECG based on a static heart model is almost unchanged when compared with a normal ECG. Conclusions: This study confirms the importance of the mechanical factor in the ECG simulation. The dynamic heart model could provide more accurate ECG simulation, especially for myocardial ischemia or infarction simulation, since the main ECG changes occur at the ST segment and T wave, which correspond with cardiac systole and diastole phases.

scholarly journals 25First evidence that differences in the t-wave upslope of the body surface ECG reflect right to left dispersion of repolarization in the intact human heart

EP Europace ◽  
2017 ◽  
Vol 19 (suppl_1) ◽  
pp. i11-i11
Author(s):  
NT Srinivasan ◽  
M Orini ◽  
R Providencia ◽  
RB Simon ◽  
MD Lowe ◽  
...  
Keyword(s):  
Body Surface ◽  
Human Heart ◽  
The Body ◽  
T Wave ◽  
Dispersion Of Repolarization ◽  
Surface Ecg

Simulation of Body Surface Laplacian Maps during Ventricular Pacing in a 3D Inhomogeneous Heart-Torso Model

2000 ◽  
Vol 39 (02) ◽  
pp. 196-199 ◽  
Author(s):  
K. Ono ◽  
H. Hosaka ◽  
B. He ◽  
D. Wu
Keyword(s):  
Computer Simulation ◽  
Electrical Activity ◽  
Body Surface ◽  
The Body ◽  
Heart Model ◽  
Surface Laplacian ◽  
Cardiac Electrical Activity ◽  
Torso Model ◽  
Potential Map ◽  
Body Surface Potential

Abstract:A computer simulation study has been conducted to investigate the performance of body surface Laplacian maps (BSLMs) in localizing and imaging spatially separated myocardial electrical events. A cellular automaton model of ventricles simulates cardiac electrical activity using a two-site pacing protocol to induce dual simultaneously active myocardial electrical events. The heart model is embedded in a realistically shaped inhomogeneous volume conductor. The BSLMs are numerically computed from the induced electrical activity in the heart model. The present computer simulation results show that the BSLM can provide better separation and localization of two regional myocardial electrical events as compared with the body surface potential map (BSPM).

Features of ST segment and T-wave in exercise-induced myocardial ischemia evaluated with multichannel magnetocardiography

2002 ◽  
Vol 34 (2) ◽  
pp. 120-129 ◽  
Author(s):  
Helena Hänninen ◽  
Panu Takala ◽  
Petri Korhonen ◽  
Lasse Oikarinen ◽  
Markku Mäkijärvi ◽  
...  
Keyword(s):  
Myocardial Ischemia ◽  
T Wave ◽  
St Segment ◽  
Exercise Induced

scholarly journals Contributions of the 12 Segments of Left Ventricular Myocardium to the Body Surface Potentials

2007 ◽  
pp. 300-309
Author(s):  
Juho Väisänen ◽  
Jesús Requena-Carrión ◽  
Felipe Alonso-Atienza ◽  
Jari Hyttinen ◽  
José Luis Rojo-Álvarez ◽  
...  
Keyword(s):  
Body Surface ◽  
Ventricular Myocardium ◽  
Left Ventricular ◽  
The Body ◽  
Left Ventricular Myocardium ◽  
Surface Potentials

Multiresolution wavelet analysis of the body surface ECG before and after angioplasty

1995 ◽  
Vol 23 (5) ◽  
pp. 553-561 ◽  
Author(s):  
Boris Gramatikov ◽  
Sun Yi-chun ◽  
Herve Rix ◽  
Pere Caminal ◽  
Nitish V. Thakor
Keyword(s):  
Wavelet Analysis ◽  
Body Surface ◽  
The Body ◽  
Surface Ecg ◽  
Before And After ◽  
Multiresolution Wavelet Analysis ◽  
Multiresolution Wavelet

scholarly journals Pneumopericardium after Laparoscopic Hernia Repair Presents with ST-segment Changes: A Case Report

2021 ◽  
Vol 2 (5) ◽  
pp. 178-181
Author(s):  
Demi Galindo ◽  
Emily Martin ◽  
Douglas Franzen
Keyword(s):  
Pulmonary Embolism ◽  
Case Report ◽  
Chest Pain ◽  
Myocardial Ischemia ◽  
Hernia Repair ◽  
Laparoscopic Hernia Repair ◽  
T Wave ◽  
St Segment ◽  
Electrocardiogram Ecg ◽  
Unnecessary Intervention

Introduction: Although rare, iatrogenic cases of pneumopericardium have been documented following laparoscopic surgery and mechanical ventilation. Electrocardiogram (ECG) changes, including ST-segment depressions and T-wave inversions, have been documented in cases of pneumopericardium, and can mimic more concerning causes of chest pain including myocardial ischemia or pulmonary embolism. Case Report: This unique case describes a patient who presented with chest pain and ST-segment changes on ECG hours after a laparoscopic inguinal hernia repair and who was found to have pneumopericardium. Conclusion: While iatrogenic pneumopericardium is often self-limiting and rarely requires intervention, it is critical to differentiate pneumopericardium from other etiologies of chest pain, including myocardial ischemia and pulmonary embolism, to prevent unnecessary intervention.

scholarly journals A New Method for Detecting Myocardial Ischemia Based on ECG T-Wave Area Curve (TWAC)

2021 ◽  
Vol 12 ◽  
Author(s):  
Ronghua Li ◽  
Xiaoye Zhao ◽  
Yinglan Gong ◽  
Jucheng Zhang ◽  
Ruiqing Dong ◽  
...  
Keyword(s):  
Myocardial Ischemia ◽  
Clinical Manifestations ◽  
Preliminary Test ◽  
New Method ◽  
Test Results ◽  
Ecg Changes ◽  
T Wave ◽  
Disability Rate ◽  
St Segment ◽  
Sensitivity Specificity

In recent years, coronary heart disease (CHD) has become one of the main diseases that endanger human health, with a high mortality and disability rate. Myocardial ischemia (MI) is the main symptom in the development of CHD. Continuous and severe myocardial ischemia will lead to myocardial infarction. The clinical manifestations of MI are mainly the changes of ST-T segment of ECG, that is, ST segment and T wave. Nearly one third of patients with CHD, however, has no obvious ECG changes. In this paper, a new method for detecting MI based on the T-wave area curve (TWAC) was proposed. Through observation and analysis of clinical data, it was found that there exist significant correlation between the morphology of TWAC and MI. The TWAC morphology of normal subject is smooth and gentle, while the TWAC morphology of patients with coronary stenosis is mostly jagged, and the curve becomes more severe with more severe stenosis. The preliminary test results show that the sensitivity, specificity, and accuracy of the proposed method for detecting MI are 84.3, 83.6, and 84%, respectively. This study shows that the TWAC based approach may be an effective method for detecting MI, especially for the CHD patients with no obvious ECG changes.

The QRS electrocardiogram, epicardiogram, vectorcardiogram and ventricular excitation of swine

1960 ◽  
Vol 198 (3) ◽  
pp. 537-542 ◽  
Author(s):  
Robert L. Hamlin
Keyword(s):  
Right Ventricular ◽  
Body Surface ◽  
The Body ◽  
Ventricular Free Wall ◽  
Activation Process ◽  
Free Wall ◽  
Right Ventricular Free Wall ◽  
Surface Potentials ◽  
Ventricular Activation ◽  
Three Components

The ventricular activation process of normal pigs as estimated qualitatively from body surface potentials and epicardial electrograms is similar to that accurately described for the dog. Ventricular excitation may be divided sequentially into three components: interventricular septal from left to right, ventricular free-wall from endocardium to epicardium, and septal and ventricular basilar in an apico-basilar direction. The differences between the body surface potentials recorded from the dog and from the pig lies in the greater dorsal magnitude of the terminal basilar forces in the pig.

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