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In this work we studied the evolution of increased ventricular repolarization dispersion (VRD) in the ECG during ischemia induced by percutaneous transluminal coronary angioplasty (PTCA). T-wave duration is measured by an automatic delineator and proposed as a index to quantify increased VRD. Moreover, spatial complexity of repolarization is measured by singular value decomposition (SVD) related indexes...
In this work we studied the evolution of ventricular repolarization dispersion (VRD) in the ECG during ischemia induced by Percutaneous Transluminal Coronary Angioplasty (PTCA). We hypothesized that at early ischemia stages the endocardium action potential duration (APD) is slightly reduced or unchanged while the epicardium one is reduced in a larger proportion and afterwards the APD at the epicardium...
Abnormal increase of ventricular repolarization dispersion (VRD) is an important risk factor for severe arrhythmia development. An increased VRD implies a modification of the spatio/temporal T wave morphology. Our objective is to study the ECG derived VRD feature markers that better represent the electrical modifications generated by increased VRD in an in vitro rabbit heart experiment which has global...
The precise measurement of QT interval and QRS complex duration is important to characterize the electrical cardiac activity of the surface ECG. Variations of these intervals were evaluated when ECG sampling rate changes. The ECG recordings used in this study (n=78) were obtained from a combination of pharmacological blockage and postural changes. The ECG recordings were originally sampled at 500...
The measurement of QT interval on ECG is a marker for malignant ventricular arrhythmias. When QT is measured, it must be corrected to become independent of heart rate (HR) and become a comparable measure of repolarization between different conditions. The objective of this work was to evaluate different types of QT interval correction (Bazzett, Individual and Hodges) for different QT/RR relations...
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