منابع مشابه
Physical determinants of left ventricular isovolumic pressure decline: model prediction with in vivo validation.
The rapid decline in pressure during isovolumic relaxation (IVR) is traditionally fit algebraically via two empiric indexes: tau, the time constant of IVR, or tau(L), a logistic time constant. Although these indexes are used for in vivo diastolic function characterization of the same physiological process, their characterization of IVR in the pressure phase plane is strikingly different, and no...
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The paper explores the modelling and simulation of a Radio Frequency Micro Electro-Mechanical Systems (RF MEMS) switch with the use of a novel seesaw design providing Double-Pole Double-Throw (DPDT) functionality. This optimises the capabilities of the seesaw design structure for use in mobile communications systems and devices. After researching other available seesaw designs, it was realised ...
متن کاملDifferential laws of left ventricular isovolumic pressure fall.
An attempt has been made to test for a reliable method of characterizing the isovolumic left ventricular pressure fall in isolated ejecting hearts by one or two time constants, tau. Alternative nonlinear regression models (three- and four-parametric exponential, logistic, and power function), based upon the common differential law dp(t)/dt = - [p(t)-P ]/ tau(t) are compared in isolated ejecting...
متن کاملPostextrasystolic left ventricular isovolumic pressure decay is not monoexponential.
OBJECTIVE The relationship between the left ventricular (LV) relaxation time constant and early diastolic filling is not fully defined. This study provides additional evidence that LV isovolumic pressure fall in the normal intact heart in response to certain interventions is not adequately described by a model of monoexponential decay and that its relationship to filling is complex. METHODS A...
متن کاملQuantitative comparison of canine right and left ventricular isovolumic pressure waves.
The mechanical properties of the right and left ventricles (RV and LV) have previously been studied separately. However, because of differences in RV and LV architecture, geometry, and muscle mass, it is not obvious how the properties of the two chambers would relate to each other. This study compared the time courses of RV and LV isovolumic pressure waves (LVP, RVP, respectively) measured simu...
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ژورنال
عنوان ژورنال: Circulation
سال: 1990
ISSN: 0009-7322,1524-4539
DOI: 10.1161/01.cir.82.3.1077