INTRODUCTION Several studies have shown that the fast pathway is more responsive to adenosine than the slow pathway in patients with AV nodal reentrant tachycardia. Little information is available regarding the effect of adenosine on anterograde and retrograde fast pathway conduction. METHODS AND RESULTS The effects of adenosine on anterograde and retrograde fast pathway conduction were evalu...

The effects of quinidine and lidocaine on the maximum upstroke velocity (Vmax) of the ventricular myocardial action potential were compared with the effects predicted by a model over a wide range of driving rates, rhythm disturbances and holding potentials. These rate-, rhythm- and voltage-dependent effects were accurately predicted by the proposed model. The model was also able to predict seve...

myocardial infarction and tobacco smoking: risk of heart rhythm and conduction disorders e imani , msc n hajizadeh , bs z khademy , msc f naghizadeh , bsc received: 6 aug, 2009 accepted: 17 oct, 2009 abstract background & aims: smoking increases risk of myocardial infarction and its complications. in addition, it increases blood pressure, heart rate and vasoconstriction. the purpose of this res...

Objective- To compare the effects of xylazine-ketamine and xylazine-thiopental on cardiac rhythm indogs.Design- Experimental study.Animals- 15 mixed-bred, adult dogs of either sex.Procedures- Following premedication with xylazine HCI, either ketarnine HCI or sodium thiopentalwere administered to dogs. Cardiac rhythm was evaluated before as well as 15,30,45, and 60 minutes and3 days after induct...

The electrical activity of insulin-secreting pancreatic islets of Langerhans is characterized by bursts of action potentials. Most often this bursting is periodic, but in some cases it is modulated by an underlying slower rhythm. We suggest that the modulatory rhythm for this complex bursting pattern is due to oscillations in glycolysis, while the bursting itself is generated by some other slow...

The classical tango is a dance characterized by a 2/4 or 4/4 rhythm in which the partners dance in a coordinated way, allowing dynamic contact. There is a surprising similarity between the tango and how KCNE β-subunits "dance" to the fast rhythm of the cell with their partners from the Kv channel family. The five KCNE β-subunits interact with several members of the Kv channels, thereby modifyin...

the aim of this study was to investigate the effect of moderate rhythm of music on perceived exertion and heart rate during different intensities of endurance training in young male athletes. 10 male athletic students (mean + sd age 21.6±2.60 years) were voluntarily selected. the present study was conducted in a crossover design with and without music. the results showed no significant differen...

This paper introduces a biologically realistic mathematical, computational model of theta (≈5 Hz) rhythm generation in the hippocampal CA1 region and some of its possible further applications in drug discovery and in robotic/computational models of navigation. The model shown here uses the conductance based description of nerve cells: populations of basket cells, alveus/lacunosum-moleculare int...

In all ages and countries, music and dance have constituted a central part in human culture and communication. Recently, vocal-learning animals such as parrots and elephants have been found to share rhythmic ability with humans. Thus, we investigated the rhythmic synchronization of budgerigars, a vocal-mimicking parrot species, under controlled conditions and a systematically designed experimen...