INTRODUCTION The induction of ventricular fibrillation (VF) by T-wave shocks has been related to dispersion of repolarisation, but only indirect evidence of this hypothesis exists. The effects of drugs prolonging repolarisation like d-sotalol on the vulnerability to T-wave shocks remain unknown. METHODS In 9 isolated rabbit heart, 7 monophasic action potentials (MAPs) and an ECG were recorded...

Left stellate or right stellate ganglion stimulation (LGSG or RSGS, respectively) is associated with ventricular tachyarrhythmias; however, the electrophysiological mechanisms remain unclear. We assessed 1) regional dispersion of myocardial repolarization during RSGS and LSGS and 2) regional electrophysiological mechanisms underlying T-wave changes, including T-peak to T-end (Tp-e) interval, wh...

This paper concerned with the dispersion of Love wave in a fiber-reinforced medium lying over a heterogeneous half-space. The heterogeneity is caused by the consideration of quadratic variation in density and directional rigidity of lower half-space. The irregularity has been considered in the form of rectangle at the interface of the fiber-reinforced layer and heterogeneous half-space. The dis...

Methodological Considerations To the Editor: With great interest, we have read the article of Fan and colleagues1 on the effects of biatrial pacing in the prevention of postoperative atrial fibrillation after coronary artery bypass surgery. By measuring P-wave duration from 12-lead surface ECGs and calculating P-wave dispersion, they found that biatrial pacing resulted in a more significant red...

OBJECTIVE Familial mediterranean fever (FMF) is the most common auto-inflammatory disease that is characterized by recurrent, self-limited attacks of fever and serous membrane inflammation. Patients with inflammatory rheumatic diseases are considered to have a raised cardiovascular diseases risk. The aim of this study was to investigate; by means of P wave dispersion (Pd) and QT dispersion (QTd...

shear-wave velocity ( ) is an important parameter used for site characterization in geotechnical engineering. however, dispersion curve inversion is challenging for most inversion methods due to its high non-linearity and mix-determined trait. in order to overcome these problems, in this study, a joint inversion strategy is proposed based on the particle swarm optimization (pso) algorithm. the ...

OBJECTIVE The aim of this study was to investigate QT dispersion (QTd), which is the noninvasive marker of ventricular arrhythmia and sudden cardiac death, and P-wave dispersion, which is the noninvasive marker of atrial arrhythmia, in patients with conversion disorder (CD). PATIENTS AND METHODS A total of 60 patients with no known organic disease who were admitted to outpatient emergency cli...

Objective: Atrial fibrillation (AF), commonly observed in advanced ages, displays striking age dependent increase and increased P wave dispersion (PWD) has been shown to be a predictor of AF. In this study we sought to determine whether P wave duration and PWD increase with aging. Method and Results: Eighty-three elderly subjects (group-I mean age 75±8 years) and 40 healthy young subjects (grou...