In this study, we evaluate a preload-based Starling-like controller for implantable rotary blood pumps (IRBPs) using left ventricular end-diastolic pressure (PLVED) as the feedback variable. Simulations are conducted using a validated mathematical model. The controller emulates the response of the natural left ventricle (LV) to changes in PLVED. We report the performance of the preload-based St...

Right ventricular (RV) maximal power (PWR(mx)) is dependent on preload. The objective of this study was to test our hypothesis that the PWR(mx) versus end-diastolic volume (EDV) relationship, analogous to the load-independent stroke work (SW) versus EDV relationship (preload-recruitable SW, PRSW), is linear, with the PWR x-axis intercept (V(0PWR)) corresponding to the PRSW intercept (V(0SW)). I...

This in vitro investigation compared the effect of using either gold or titanium retaining screws on preload in the dental implant- abutment complex. Inadequate preload can result in screw loosening, whilst fracture may occur if preload is excessive. These are the most commonly reported complications in implant-retained prostheses, and result in unscheduled, costly and time-consuming visits for...

The mediating influence of self-esteem on disinhibited eating was assessed in restrained and unrestrained subjects. Self-esteem was unrelated to the eating behavior of unrestrained subjects following a preload, but did moderate the disinhibitory effects of a preload on restrained subjects. Specifically, only those restrained subjects with low self-esteem displayed disinhibited eating after a pr...

decreased the average number of clock cycles per instruction. As a result, each execution cycle has become more signiicant t o o v erall system performance. To maximize the eeectiveness of each cycle, one must expose instruction-level parallelism and employ memory latency tolerant techniques. However, without special architecture support, a superscalar compiler cannot eeec-tively accomplish the...

We discuss the use of a flat-plane slider for a surface acoustic wave (SAW) motor. For stable driving, the SAW motor requires a silicon slider with many microprojections on its surface. Previously, sliders with no projections on the flat-plane surface could not provide stable drive because of contact electrification occurring due to the low electrical conductivity of the lithium niobate stator....

The concept of end-systolic myocardial stiffness permits the quantification of preload effects on fiber shortening and changes in the slope (max Eav) of the end-systolic stress-strain relation, which, if linear, reflect changes in the inotropic state. As an application of this new concept, the end-systolic stress-strain and shortening-afterload relations were evaluated on the basis of data from...

BACKGROUND Transmitral Doppler flow indices are used to evaluate diastolic function. Recently, velocities measured by Doppler tissue imaging have been used as an index of left ventricular relaxation. OBJECTIVE To determine whether Doppler tissue velocities are influenced by alterations in preload. METHODS Left ventricular preload was altered in 17 patients (all men, mean (SD) age, 49 (8) ye...

We introduce an agility measure enabling the comparison of two very di↵erent leaping-from-rest transitions by two comparably powered but morphologically di↵erent legged robots. We use the measure to show that a flexible spine outperforms a rigid back in the leapingfrom-rest task. The agility measure also sheds light on the source of this benefit: core actuation through a su ciently powerful par...

INTRODUCTION In septic shock, pulse pressure or cardiac output variation during passive leg raising are preload dependence indices reliable at predicting fluid responsiveness. Therefore, they may help to identify those patients who need intravascular volume expansion, while avoiding unnecessary fluid administration in the other patients. However, whether their use improves septic shock prognosi...