Paulo Roberto Benchimol-Barbosa

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This paper proposes a technique to improve the quality of high-resolution electrocardiogram by weighting the coherent average of beats by a function of the energy of the corrupting myoelectric noise, prior to subsequent detection of ventricular late potentials. The results obtained with 20 patients indicate the method requires fewer beats than conventional(More)
BACKGROUND The athlete's heart represents a reversible structural and functional adaptations of myocardial tissue developed through physical conditioning. Surface electrocardiogram (ECG) has the capability to detect myocardial hypertrophy but has limited performance in monitoring physical conditioning-induced myocardial remodeling. The aim of this study was(More)
This study investigated dynamic atrio-ventricular duration (AVD) and phase-rectification-driven RRinterval coupling to assess AV conduction facilitation in healthy and chronic Chagas disease (ChD) subjects. All subjects were in sinus rhythm and underwent 60 min head-up tilt table test under ECG recording. ChD group underwent MIBG scintigraphy and confirmed(More)
BACKGROUND In chronic Chagas disease (ChD), impairment of cardiac autonomic function bears prognostic implications. Phase‑rectification of RR-interval series isolates the sympathetic, acceleration phase (AC) and parasympathetic, deceleration phase (DC) influences on cardiac autonomic modulation. OBJECTIVE This study investigated heart rate variability(More)
Dynamic ventricular repolarization duration (VRD) and phase-rectification-driven RR-interval coupling was investigated aiming at assessing myocardial electrical stability in healthy and chronic Chagas disease (ChD) subjects. All were in sinus rhythm and underwent 60 min head-up tilt table test under ECG recording. ChD group underwent MIBG scintigraphy and(More)
Micro T-wave alternans (MTWA) is a risk marker for life threatening ventricular tachyarrhythmia. Classically, MTWA is assessed by quantification of beat-by-beat T-wave amplitude alternation. This method requires accurate determination of T-wave peaks (discrete method) to create a sequence of T-wave amplitude series, which undergoes spectral analysis using(More)
The purpose was to investigate the application of principal components analysis (PCA) on power spectral density function (PSD) computed by heart rate variability (HRV) signals aiming at distinguishing physical conditioning status. Ten healthy sedentary volunteers (controls) and ten matched professional long distance runners (athlete) were enrolled. The(More)
The accuracy of high resolution electrocardiogram (HRECG) as a risk stratification tool relies on QRS offset detection, which is subject to variation due to signal residual noise level (RNL). This study proposed a technique for improving the accuracy of QRS offset detection, based on successive signal derivation (DER) and compared to the standard method(More)
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