1,721,037 research outputs found
Pioneering Long-Term Outcome of Transcatheter Aortic Valve Replacement in Nonagenarians: A Scientific Odyssey
No full textIl cuore nella città: La nuova semeiotica con lo stetoscopio ultrasonoro [The heart in the city: the new semeiotics with the ultrasonic stethoscope]
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Reply to "Comparison of Accuracy of Left Atrial Area and Volume by Two-Dimensional Transthoracic Echocardiography Versus Computed Tomography"
No full textEchocardiographic red flags in transthyretin amyloid cardiomyopathy: all that glitters is not gold
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Impact of physical training on normal age-related changes in left ventricular longitudinal function
No full textLeft ventricular flow dynamics by cardiac imaging techniques in heart failure patients: state of the art
No full textBackground: The evaluation of left ventricular (LV) flow dynamics is a novel approach to assessing LV function that goes beyond traditional metrics. This approach has been applied to patients with heart failure (HF), providing valuable insights that are discussed in this review, with the aim of enhancing our understanding of LV function in the context of the HF syndrome. Methods: The analysis of LV flow dynamics is typically conducted using ultrasound and magnetic resonance imaging (MRI) techniques, primarily including particle image velocimetry echocardiography, Vector Flow Imaging, HyperDoppler, and four-dimensional flow MRI. A variety of parameters can be obtained that describe the geometry of the LV vortex, vorticity, kinetic energy, energy dispersion, as well as the amplitude and direction of the hemodynamic forces within the LV cavity. Results: In normal subjects, vortex formation plays a crucial role in optimizing LV filling, diastolic-systolic coupling, and energy transfer during systolic ejection. In patients with HF, alterations in vortex structure and dynamics have been associated with both systolic and diastolic LV dysfunction, demonstrating the potential to diagnose early LV dysfunction. Furthermore, these alterations have been linked to LV remodeling and thrombus formation. Several studies have also explored intracardiac flow metrics as biomarkers for guiding HF treatments, including pharmacological interventions, cardiac resynchronization therapy, and LV assist devices. Conclusions: Currently available data suggest that the evaluation of LV flow dynamics can have diagnostic and prognostic utility in HF. However, large-scale, multicenter, and prospective studies are needed, particularly to validate therapeutic implications
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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