Objectives. This study was planned to evaluate the relation between QT dispersion (QTd) and multi-vessel coronary artery disease in acute coronary syndrome. Methods. Two hundreds and twenty-five consecutive patients with a diagnosis of non-ST segment elevation acute coronary syndrome were included. Three groups were defined as a single vessel, two vessels, and three vessels. Echocardiographic, ...

Background Breath-holding spells (BHS) are brief periods when young children stop breathing for up to 1 minute and are widely recognized types of non-epileptic severe occasions in early stages of childhood. This study aimed to evaluate QTd and QTc changes in children with breath-holding spells compared with healthy children. <stron...

Background: Cigarette smoking has several known detrimental effect on cardiovascular system.  QT dispersion (QTd) is among the important predictors of cardiac death. Objective:  To assess the acute effect of smoking of a single standard cigarette on QT and QTc (corrected QT) dispersion, hence on the risk of ventricular arrhythmias in healthy smokers and non-smokers. Methods: 111 healthy men wit...

Quantum time dynamics (QTD) is considered a promising problem for quantum supremacy on near-term computers. However, QTD circuits grow with increasing simulations. This study focuses simulating the of one-dimensional (1D) integrable spin chains nearest-neighbor interactions. We have proved existence reflection symmetry in circuit employed evolution certain classes 1D Heisenberg model Hamiltonia...

A digraph D is called a quasi-transitive digraph (QTD) if for any triple x, y, z of distinct vertices of D such that (x, y) and (y, z) are arcs of D there is at least one arc from x to z or from z to x. Solving a conjecture by J. Bang-Jensen and J. Huang (J. Graph Theory, to appear), G. Gutin (Australas. J. Combin., to appear) described polynomial algorithms for finding a Hamiltonian cycle and ...

Attention-deficit hyperactivity disorder is a frequent condition in children and often extends into adulthood. Use of immediate-release methylphenidate (MPH) has raised concerns about potential cardiovascular adverse effects within a few hours after administration. This study was carried out to investigate acute effects of MPH on electrocardiogram (ECG) in a pediatric population. A total of 54 ...

BACKGROUND High incidence of premature ventricular contractions (PVCS) and arrhythmia during and soon after dialysis have been demonstrated by Holter monitoring. OBJECTIVES In this study, the effects of dialysis and renal transplantation on Tpe, Tpec (corrected Tpe), QTc (corrected QT), QTd (QT dispersion), and Tpe/QT parameters as known factors in arrhythmogenicity, and also the correlation ...