Objectives. Increased Tp-e interval (from the peak-to-the-end of the electrocardiographic T wave) and Tpe/QT ratio are associated with malignant ventricular arrhythmias. We aimed to evaluate the acute effects of levosimendan on Tp-e interval, Tp-e/QT ratio, Tp-e/QTc ratio and QRS interval in patients with severe heart failure. Methods. The study included 85 patients with decompansed heart failu...

he congenital long QT syndrome (LQTS) is characterized by abnormally prolonged ventricular repolarization, leading to QT prolongation on the ECG, with frequent development of the polymorphic ventricular tachycardia known as torsades de pointes (Tdp), syncope or sudden cardiac death.1,2 Most cases of congenital LQTS are caused by gene mutations in several ion channels and their interacting prote...

OBJECTIVES This study was designed to determine whether cardiac resynchronization therapy (CRT) by means of biventricular pacing (BiVP) alters the QT interval (QT(c)) and QT dispersion (QTD), and whether such changes relate to the risk of developing major arrhythmic events (MAE). BACKGROUND Prolonged QT(c) is associated with MAE. Left ventricular pacing and BiVP alter QT(c). METHODS A total...

We studied the effect of furosemide on pulmonary oxygen exchange, lung liquid, and central hemodynamics in dogs with pulmonary capillary leak induced by intravenous oleic acid (OA). 2 h after OA, triple indicator-dilution lung liquid volume and pulmonary shunt (Qs/Qt) doubled despite normal pulmonary capillary wedge pressure in 16 dogs compared with dogs not given OA in which no variable change...

The coronary endothelial function is recognized to have an important role in the physiology of the diastolic ventricular relaxation, a phase of the heart cycle that influences the electrocardiographic QT interval. Endothelial function is investigated in vivo by flow mediated dilation (FMD) in the brachial artery and has proven to be a strong predictor of both coronary endothelial function and c...

The study of the dynamicity of the response of the heart ventricles to external stimuli is of major interest to assess the risk of sudden death. The given task is to predict the changes of the so called QT duration in function of the instantaneous changes of the RR interval. The QT interval measures the duration of activation and inactivation of the heart ventricles while the RR interval repres...

Torsades de pointes is a rare but potentially lethal arrhythmia which mainly occurs in the setting of a prolonged QT interval. ECG is a reliable tool to detect such abnormalities, routinely taken from all patients over 40 who undergo surgery. We describe the case of a 35-year-old woman with torsades de points arrhythmia after hysterectomy surgery. Most likely, our patients had long QT syndro...

In this paper, we study the Chebyshev centres of bounded subsets of normed spaces and obtain a norm inequality for relative centres. In particular, we prove that if T is a remotal subset of an inner product space H, and F is a star-shaped set at a relative Chebyshev centre c of T with respect to F, then llx - qT (x)1I2 2 Ilx-cll2 + Ilc-qT (c) 112 x E F, where qT : F + T is any choice functi...