BACKGROUND Marked changes in ventricular APD restitution and associated alternans rhythm have been demonstrated in structural heart disease (SHD). However, whether this is due to structural heterogeneity or regional variation in cellular properties remains uncertain. In this study, we address the hypothesis that the structural heterogeneity associated with SHD is sufficient to alter dynamic res...

To analyse fracture healing repeated X-rays are needed increasing the problem of radiation. Though already Electric Current is used widely in therapeutic aspect to accelerate fracture healing, only recently it has been tried as a diagnostic tool in assessing fracture healing. To study conduction across a fracture the first step is to devise a suitable simulated structural support for fracture i...

We have previously demonstrated that the rectosigmoid junction is more than a junction: it is a segment with a mean length of 2.8 cm which we termed the 'rectosigmoid canal' (RSC). Our data support the existence of a physiologic and anatomic sphincter at the RSC which regulates the passage of stools from the sigmoid colon (SC) to the rectum (R). In view of its sphincteric action we investigated...

VENTRICULAR fusion beats are observed in a variety of circumstances whenever two impulses depolarize different parts of the ventricles simultaneously.' The resulting electrocardiographic complex is a mixture, or fusion, of the two responses. Special opportunities for quantitative studies of ventricular fusion beats were found in patients with Stokes-Adams disease after electric pacemakers were ...

The conduction system of the heart initiates and coordinates the electric signal that causes the rhythmic and synchronized contractions of the atria and ventricles. In higher vertebrates, this system comprises the sinuatrial (SAN) and atrioventricular nodes (AVN) and the “wiring” of the ventricles. The latter comprises the atrioventricular bundle (AVB), the left and right bundle branches (BBs),...

The conduction system of the heart initiates and coordinates the electric signal that causes the rhythmic and synchronized contractions of the atria and ventricles. In higher vertebrates, this system comprises the sinuatrial (SAN) and atrioventricular nodes (AVN) and the “wiring” of the ventricles. The latter comprises the atrioventricular bundle (AVB), the left and right bundle branches (BBs),...

The conduction system of the heart initiates and coordinates the electric signal that causes the rhythmic and synchronized contractions of the atria and ventricles. In higher vertebrates, this system comprises the sinuatrial (SAN) and atrioventricular nodes (AVN) and the “wiring” of the ventricles. The latter comprises the atrioventricular bundle (AVB), the left and right bundle branches (BBs),...

It was thought previously that cardiac muscle gap junctions provide low-resistance connections between cells and permit the local-circuit current to flow. Some evidences show that myocardial cells may not require low-resistance connections for successful propagation of the action potential (AP). It seems that some other types of mechanisms must be involved in AP propagation. In this article, we...

In this work, efficient solar-blind metal-semiconductor photodetectors grown on Si (111) by molecular beam epitaxy are reported. Growth details are described,the comparison enters the properties electric of InN/Si and AlGaN/Si photodectors with 0.2 μm of AlGaN and InN layers. Modeling and simulation were performed by using ATLAS-TCAD simulator. Energy band diagram, doping profile, conduction cu...