Iana Ivaylova Simova

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BACKGROUND The QT interval and the QT dispersion are currently a subject of considerable interest. Cardiac repolarization delay is known to favor the development of arrhythmias. The QT dispersion, defined as the difference between the longest and the shortest QT intervals or as the standard deviation of the QT duration in the 12-lead ECG is assumed to be(More)
OBJECTIVE To evaluate the SCHILLER BR-102 plus (Schiller AG, Baar, Switzerland) noninvasive ambulatory blood pressure recorder according to the International Protocol for validation of blood pressure measuring devices in adults introduced by the Working Group on Blood Pressure Monitoring of the European Society of Hypertension. METHOD One SCHILLER BR-102(More)
Flow-mediated dilatation (FMD) and intima-media thickness (IMT) are noninvasive methods for patient evaluation. In this study we aimed to estimate the correlation between FMD and IMT in patients with different degree of coronary artery disease (CAD) development, and to explore their prognostic significance for the presence of angiographically significant(More)
The aim of the study is to assess the performance of an automated method for Q-onset and T-end delineation, as well as QT measurement with the use of a 'gold standard' of a manually created reference database. The data to be used comprise 548 recordings of the PTB Diagnostic ECG Database. The ECG signals are preprocessed, suppressing power-line(More)
No signal processing technique has been able to reliably deliver an undistorted fetal electrocardiographic (fECG) signal from electrodes placed on the maternal abdomen because of the low signal-to-noise ratio of the fECG recorded from the maternal body surface, resulting in increased rates of Caesarean deliveries of healthy infants. In an attempt to solve(More)
Purpose. To evaluate the clinical applicability of a telemonitoring system: telemetric system for collection and distant surveillance of medical information (TEMEO). Methods. We evaluated 60 patients, applying simultaneously standard Holter ECG and telemonitoring. Two different comparisons were performed: (1) TEMEO ECG with standard 12-lead ECG; (2) TEMEO(More)
No signal processing technique has been able to reliably deliver an undistorted fetal electrocardiographic (fECG) signal from electrodes placed on the maternal abdomen because of the low signal-to-noise ratio of the fECG recorded from the maternal body surface. As a result, this led to increased rates of Caesarean deliveries of healthy infants. In an(More)
ECG telemonitoring is a relatively new advancement of medical technology which enables distant control of the health status. There is a great research progress in recording, wireless transfer and automatic analysis of ECG signals, but clinical experience with working ECG telemonitoring systems is very limited. We evaluated 60 patients, applying(More)
Prevalence of diabetes mellitus (DM) is progressively increasing, contributing to a parallel increase in cardiovascular morbidity and mortality, and more than doubling the incidence of sudden cardiac death (SCD). Certain electrocardiographic (ECG) characteristics, such as alternans of the T wave (TWA), heart rate variability (HRV) and dispersion of the QT(More)
The aim of the study is to evaluate the influence of diabetes mellitus (DM) on T-wave and QRS-complex alternans (TWA&QRSA) during stress ECG testing. Principal component analysis, combined with wave amplitude computation was used for TWA&QRSA quantification. We studied 77 patients (64±1 1 years, 44% male). DM was present in 43% and(More)