Milan Tysler

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Electrogastrogram (EGG) is a noninvasive recording of the electrical activity of the stomach. Dominant component of gastric electrical activity called also slow waves originates from the activity of the network of interstitial cells of Cajal located in the gastric wall. The electrogastrographic signal requires longer recording times (usually tens of(More)
A method using body surface potential maps for assessment of myocardium lesions with changed repolarization is presented and suitable mapping system is introduced. Differences between normal and altered QRST integral maps together with torso volume conductor model were used to determine the equivalent dipole representing the lesion. Performance of the(More)
The effect of electrode displacement as one of the sources of reproducibility errors in body surface potential maps was studied using a realistic computer model of the cardiac electric field. A uniform dipole layer model of the cardiac generator and a realistic geometry of the torso, heart, and lungs was adopted for the simulation of surface potentials(More)
A computer model for simulation of surface ECG that enables to study heart repolarization changes is introduced. It includes heart geometry and structure description, predefined elemental action potential forms and enables computation of ECG potentials on the surface of an inhomogeneous torso. The influence of the action potentials form on the STT part and(More)
One of the main difficulties in using body surface potential mapping (BSPM) techniques is the need of complicated multi-channel measuring system. In this paper practical portable ECG mapping system is introduced. The system consists of a notebook computer and a data acquisition system box connected to the computer by fast IEEE 1284 parallel interface(More)
BACKGROUND The purpose of this study was to observe the influence of variety in individual torso geometries on the results of inverse solution to 2 dipoles. METHODS The inverse solution to 2 dipoles was computed from the measured data on 8 patients using either standard torso with various shapes and sizes of the heart and lungs in it or using various(More)
Portable device for multi-channel ECG measurement and body surface potential (BSP) mapping is introduced and its possible application for cardiac diagnostic is presented. The device is designed for simultaneous measurement of up to 144 body surface potentials relatively to a relocatable reference electrode. Use of active electrodes, driven grounding(More)
Two inverse methods using dipole models for noninvasive assessment of local repolarization changes were investigated and compared in the simulation study. Lesions with changed repolarization were modeled by shortening of the action potential durations in ventricular regions typically influenced by occlusion of coronary arteries. Corresponding body surface(More)