Background: The role of exercise testing in the follow up of adults with a coarctation repair is unclear. Exercise induced systolic hypertension has been advocated as an indication for further investigation; however, the value of exercise testing in this role has been questioned, especially in paediatric populations. Objective: To assess the value of resting and exercise blood pressure measurem...

Aim of this study is the assessment of feasibility and clinical usefulness of a new index of stenosis severity, the slope of the instantaneous transstenotic pressure gradient/velocity relationship. Twenty-one patients scheduled for percutaneous revascularization procedures were studied with simultaneous measurement of poststenotic coronary pressure and flow velocity, in basal condition and duri...

Simultaneous intraventricular pressure gradients and ejection flow patterns were measured by a multisensor catheter in 6 patients with normal left ventricular function and no valve abnormalities, at rest and in exercise. Peak measured intraventricular pressure gradients were attained very early in ejection, amounted to 6.7 +/- 1.9 (SD) mm Hg at rest, and were intensified to 13.0 +/- 2.3 mm Hg d...

Use of an airborne platform todetermine the dynamics of atmosphericmotion has been ongoing for over three decades. Much of the effort has been centered on the determination of the horizontal pressure gradient force along an isobaric surface, and with wind measurements the nongeostrophic components of motion can be obtained. Recent advances using differential GPS-based altitude measurements allo...

Eighteen female mongrel bitches, equally divided into three groups (A, B and C) were subjected to CO2 insufflation at 6, 10 and 14 mm Hg pressure gradient respectively to study the physiological changes of capnoperitoneum during laparoscopy. Optimum visualization of internal organs during laparoscopy was achieved at 10 and 14 mm Hg of CO2 pressure gradient. The physiological effects were more p...

Recent progress in molecular ferroelectrics (MOFEs) has been overshadowed by the lack of high-quality thin films for device integration. We report a water-based air-processable technique to prepare large-area MOFE thin films, controlled by supersaturation growth at the liquid-air interface under a temperature gradient and external water partial pressure. We used this technique to fabricate ImCl...

The progressive reduction in cardiac output-and later in arterial pressures-that develops during advancing degrees of pericardial effusion is usually attributed to a steady decrease in the venoatrial pressure gradient. Evaluation of changes in instantaneous pressures in the right and left atria at the end of ventricular diastole (Z pressure) and systole (V pressure) indicates that as pericardia...

Lagrangian(and isopycnic-) vertical coordinate ocean models are subject to an exponentially growing numerical instability in weakly stratified regions when thermobaricity is not accurately compensated. Inaccurate compensation for compressibility in the pressure gradient terms leads to pressure gradient truncation errors (due to the vertical discretization) that can drive the Lagrangian coordina...

The reference standard for portal venous pressure measurement which is clinically important for estimating the. feasibility of resection of hepatocellular carcinoma is the hepatic venous pressure gradient, which is, invasive and expqnsive. The present study evaluated the noninvasive parameters for assessment of portal hypertension in Child A patients with hepatocellular carcinoma on top of hepa...

T he peak systolic pressure gradient (the difference between peak left ventricular [LV] and peak aortic systolic pressures) has been used for many years as a primary measure of severity in children with valvar aortic stenosis (AS).1-3 Reliance on the peak systolic pressure gradient in clinical decision-making was based on the practice of measuring the gradient at catheterization by withdrawing ...