among different discretization approaches, finite difference method (fdm) is widely used for acoustic and elastic full-wave form modeling. an inevitable deficit of the technique, however, is its sever requirement to computational resources. a promising solution is parallelization, where the problem is broken into several segments, and the calculations are distributed over different processors. ...

We examined left ventricular (LV) performance before, during, and following prolonged exercise (EX) in 12 healthy middle-aged men [means +/- SE: age = 43.5 +/- 1.9 yr; maximal O(2) uptake (Vo(2max)) = 51.7 +/- 1.5 ml.kg(-1).min(-1)]. Subjects cycled for 120 min at 65% Vo(2max) (75% of maximal heart rate). Two-dimensional echocardiography (ECHO) to determine tissue-Doppler longitudinal myocardia...

PURPOSE To investigate the effect of various presbyopic vision corrections on nighttime driving performance on a closed-road driving circuit. METHODS Participants were 11 presbyopes (mean age, 57.3+/-5.8 years), with a mean best sphere distance refractive error of R+0.23+/-1.53 DS and L+0.20+/-1.50 DS, whose only experience of wearing presbyopic vision correction was reading spectacles. The s...

BACKGROUND We have shown that hypertensive patients with left ventricular (LV) hypertrophy have decreased LV midwall mechanics, but the effect of antihypertensive therapy remains unclear. METHODS AND RESULTS Echocardiograms were recorded at baseline in 679 hypertensive patients and ECG LV hypertrophy and repeated yearly during 3 years of blinded treatment to achieve target blood pressures (BP...

Breathing-induced changes in intrathoracic pressures influence left ventricular (LV) and right ventricular (RV) volumes, the exact nature and extent of which have not previously been evaluated in humans. We sought to examine this "respiratory pump" using novel real-time cardiac magnetic resonance (CMR) imaging. Eight healthy subjects underwent serial multislice real-time CMR during normal breat...

PURPOSE Stenosis and occlusion rates of internal mammary artery (IMA) and saphenous vein (SV) coronary artery bypass grafts (CABGs) are markedly different, which result from respective disparities in vascular remodeling. Matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) regulate vascular structure and may have important influence on graft patency. However, the...

Let A be a subset of Fp , the n-dimensional linear space over the prime field Fp of size at least δN (N = p), and let Sv = P −1(v) be the level set of a homogeneous polynomial map P : Fp → Fp of degree d, for v ∈ Fp . We show, that under appropriate conditions, the set A contains at least cN |S| arithmetic progressions of length l ≤ d with common difference in Sv, where c is a positive constant...

Background: To compare transrectal ultrasonography (TRUS) and TRUS-guided seminal vesicle aspiration in the diagnosis of ejaculatory duct obstruction (EDO). comparing the findings of TRUS and TRUS-guided seminal vesicle (SV) aspiration. Materials and Methods: Design: A retrospective case-controlled study comparing the findings of TRUS and TRUS-guided seminal vesicle (SV) aspiration. Setting: Cl...

We developed a framework of analysis to predict the stroke volume (SV) resulting from the complex mechanical interaction between the ventricle and its arterial system. In this analysis, we characterized both the left ventricle and the arterial system by their end systolic pressure (Ps)-SV relationships and predicted SV from the intersection of the two relationship lines. The final output of the...

OBJECTIVE To compare the radial artery and saphenous vein's patency in patients with recurrence of symptoms in a coronary artery bypass grafting (CABG). METHODS Retrospective study. From January 1998 to December 2005, 469 CABGs were performed using the radial artery as a graft, in Vera Cruz Hospital in Belo Horizonte/ MG. Among the patients who underwent those surgeries, 94 presented ischemic...