Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"diastole"”.
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Hydrodynamics of Cardiac Diastole
Left ventricular diastole (filling) is a complex process with many features and coupled compensatory mechanisms which coordinate to maintain optimal filling and ejection of the left ventricle. Diastolic filling is controlled by the left ventricular recoil, relaxation, and compliance as well as …
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Improving Cardiovascular Risk Assessment with CT Coronary Angiography and Myocardial CT Perfusion
… improve CT methodology, coronary motion in mid-diastole was examined utilizing both high temporal-resolution tissue Doppler imaging and CT. The period of mid-diastole was found to occur relatively later in the cardiac cycle with increasing heart rate. The study demonstrated the importance of …
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DIGITAL ANALYSIS OF CARDIAC ACOUSTIC SIGNALS IN CHILDREN
… detection of heart sounds, define systole and diastole and analyse the spectrum of a cardiac murmur. A statistical model for distinguishing physiological murmurs from pathological findings was developed using logistic regression analysis. The receiver operating characteristic (ROC) curve was …
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Left ventricular structure in children with developmental coordination disorder
… volume, and ventricular diameter in diastole. In regression analyses, p-DCD was a significant predictor of SV and CO after accounting for height, FFM, V02FFM, and sex. These differences in children with p-DCD indicate obesity related changes in the left ventricle and may represent …
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Coronary flow mechanics: an anatomically based mathematical model of coronary blood flow coupled to cardiac contraction
… limits the filling of these vessels during diastole particularly at the endocardium. An increase in heart rate, modelled by reducing the time for diastole causes an increase in small vessel epicardial blood flow and a decrease in blood flow through small vessels within the myocardium. The …
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Risk stratification of ICU patients using arterial blood pressure waveforms
… (derived from the decay from peak systole to diastole) including ASDNNDownstroke, SDANNDownstroke, rMSSDDownstroke, etc. While this body of work suggests the classifiers we developed are not effective in risk stratification of ICU patients, we discuss other methods which may extract prognostic …
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Untersuchung einer Calcineurin-bindungsdefizienten FKBP12.6-Mutante in Kardiomyozyten
… des Kanals und damit der Calciumverlust in der Diastole herabgesetzt. Die durch FKBP12.6 koordiniertere Öffnung benachbarter RyR (coupled gating) bedingt zudem eine verbesserte relative Zellverkürzung der Zelle. Da die genaue Anzahl bzw. Funktion aller Bindungspartner am RyR derzeit noch nicht …
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Determinants of left ventricular mass as measured by Doppler echocardiography in pre-adolescents
… translated to M- Mode. The dimensions at the end diastole were obtained at the onset of the QRS complex of the electrocardiogram in a plane through a standard position. Measurements included: (a) the diameter of the left ventricle at the end diastole was measured from the septum edge to the …
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Model-based quantification of systolic and diastolic left ventricular mechanics
… en vloeistofdynamische fenomenen tijdens de diastole vormden het onderwerp van het tweede deel van het onderzoek. Met behulp van een hydraulisch model van het LV werd nagegaan welke factoren een belangrijke invloed uitoefenen op het gedrag van het LV tijdens de isovolumetrische …
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Dispersive Characteristics of Left Ventricle Filling Waves
… the filling waves to improve understanding of diastole and develop robust, reliable, and quantitative parameters. This work reveals that LV filling waves in a normal ventricle act as dispersive waves and not only propagate along the length of the LV but also spread and disperse in the direction …
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Echocardiographic Investigation of Canine Myxomatous Mitral Valvular Disease
… the mitral valve annulus in systole (MVAs) and diastole (MVAd) were measured. Left atrial size was evaluated with the left atrial to aortic root ratio (LA:Ao) and by measuring left atrial volume indexed to body weight (LA Vol/BW). All patients were staged using published ACVIM guidelines and …
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Magnetic resonance imaging studies of cardiac changes in diabetic and hypertensive rats
… the cardiac cycle covering systole and most of diastole. The subsequent quantitative analysis derived the anatomical and functional indices of left and right ventricular myocardial volume, end-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), and ejection fraction (EF). They …
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Echocardiographic evaluation of horses challenged with African horse sickness virus
… in the size of the left cardiac chambers during diastole and systole were consistent findings on the last day of evaluation of each subject and suggestive of hypovolaemia. The cause of the suspected hypovolaemia was not investigated, but increased vascular permeability causing third space volume …
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Modulation of Cardiac Titin Stiffness in Physiological and Pathophysiological States
… spring that develops passive force during diastole. Titin stiffness is modulated both by isoform switching and post-translational modifications including phosphorylation. Modulation of titin stiffness occurs in physiological and pathophysiological states including Heart Failure with …
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The longitudinal outcome of canine myxomatous mitral valve disease in dogs: The LOOK Mitral study
… left ventricular internal dimensions at end-diastole were more likely to present with reoccurrence of clinical signs suggesting that closer monitoring of these dogs may be recommended.
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Novel model of cerebrospinal fluid dynamics based on hemodynamically driven cyclic brain compliance variation
… during systole the compliance diminishes, during diastole compliance increases. As brain tissue compliance changes the CSF volume inside each compartment is redistributed. Cyclic compliance variation of brain tissue creates a pulsatile CSF flow. The CSF dynamics model is also used for the analysis …
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Estimation of cardiovascular indices by analysis of the arterial blood pressure signal
… circulation) is approximately zero during diastole, the diastolic ABP waveforms can be regarded as auto-regressive (AR). By the AR analysis of multiple diastolic ABP waveforms, the AR parameters are obtained. The AR parameters were applied to the ABP waveforms (both systolic and diastolic) …
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Cardiac Structure and Function in Young Athletes
… at rest to determine left ventricular end diastole dimension (LVDd) and end systole dimension (LVDs), left ventricular posterior wall (PW), stroke volume (SV) and cardiac output (CO). On separate days, tests were conducted on a cycle ergometer to measure VO2max and anaerobic power, and …
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Redox Regulation of Type Iα PKA in the Heart
… hearts had larger left ventricles during diastole and systole and demonstrated systolic dysfunction. Cytosolic RIα disulfide translocated to membrane and myofilament in isolated WT hearts in response to oxidant. Dual-specificity AKAP (D-AKAP) 1, D-AKAP2, AKAP220 and α/β tubulin were not …
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Novel Phenotyping of the Myocardium by Diffusion Tensor Cardiovascular Magnetic Resonance
… that realign from wall-parallel in diastole, to wall-perpendicular in systole. This sheetlet mobility is integral to wall thickening. Diffusion tensor cardiovascular magnetic resonance (DT-CMR) is a novel, non-invasive technique informing about myocardial microstructure, including …
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