BACKGROUND Proponents of flexible annuloplasty rings have hypothesized that such devices maintain annular dynamics. This hypothesis is based on the supposition that annular motion is relatively normal in patients undergoing mitral valve repair. We hypothesized that mitral annular dynamics are impaired in ischemic mitral regurgitation and myxomatous mitral regurgitation. METHODS AND RESULTS A ...

The impact of annular cracks on the effective elastic and conductive properties of a material is analysed. The compliance contribution tensor of an annular crack - the quantity that determines the increase in compliance of a solid due to introduction of such a crack - is derived analytically. The resistivity contribution tensor of an annular crack is calculated numerically. It is shown that an ...

Many skin diseases appear as annular lesions. Some are more typical of adults or older children, whereas others usually appear in young children. Annular or figurate erythema of infancy comprises a group of dermatoses in which the primary lesion adopts an annular, oval circinate, or polycyclic pattern. Similarities in clinical presentation, age at onset, and duration of lesions mean that these ...

background: longer survival after the total repair of the tetralogy of fallot increases the importance of late complications such as right ventricular dysfunction. this is a prospective study of the right ventricular function in totally corrected tetralogy of fallot patients versus healthy children. methods: thirty-two healthy children were prospectively compared with 30 totally corrected tetra...

In previous reports, annular sampling has been introduced as a means for detecting symmetrically enclosing edge conngurations. Starting with a single grey-scale image, before employing annular operators, it is necessary to rst extract edges from the image. In this report, we examine why it is necessary to extract edge at multiple scales when employing annular operators. The scale of edge detect...

Annular pancreas is a rare congenital abnormality. This entity can rarely be symptomatic. Patients can present with gastrointestinal obstruction or acute pancreatitis. We report a case with a rich iconography, of an annular pancreas discovered intraoperatively. A 46-year-old woman was operated with the diagnosis of acute cholecystitis with common bile duct stones. At operation, a strip of pancr...

Molecular dynamics simulation of annular flow boiling in a nanochannel with 70000 particles is numerically investigated. In this research, an annular flow model is developed to predict the superheated flow boiling heat transfer characteristics in a nanochannel. To characterize the forced annular boiling flow in a nanochannel, an external driving force ext F ranging from 1to12PN (PN= Pico Newton...

M asterful mitral valve (MV) repair demands thorough understanding of integrated mitral apparatus structure and mechanics. One consistently reported feature, the saddle shape of the mitral annulus, was recognized in the process of resolving the contradiction posed by an apparently high prevalence of MV prolapse (MVP) in otherwise healthy individuals: A normal saddle-like shape will show opposit...

Objective: To describe the prevalence of and findings associated with annular pancreas on CT, MRI, and endoscopic retrograde cholangiopancreatography (ERCP). Design: Retrospective analysis. Participants: 42 patients with annular pancreas who underwent CT, MRI, or ERCP made up the study group. The control group consisted of 30 patients evaluated for nonspecific upper abdominal pain who had a nor...