1,721,337 research outputs found
Echocardiographic selection of candidates for cardiac resynchronization therapy: The lack of evidence! Reply
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Quantitation of shunt flow in atrial septal defects by contrast echocardiography
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Comparative assesment of left ventricular diastolic function with noninvasive and invasive techniques
No full textTransesophageal dobutamine stress echocardiography with tissue Doppler imaging for detection and assessment of coronary artery disease
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L'angiocardiografia Doppler (ecocardiografia Doppler bidimensionale a colori in tempo reale) nella diagnosi delle cardiopatie congenite e delle valvulopatie.
No full textTwo-dimensional contrast and Doppler echocardiography in congenital heart disease- Diagnostic possibilities and complementary roles.
No full textThe generai aspects and newer applications of two-dimensional, contrast, and Doppler echocardiography in the evaluation of congenital heart disease are reviewed. Real-time, two-dimensional (2-D) has provided a systematic approach to the diagnosis of complex cardiac abnormalities, looking at the heart in terms of separate developmental units, and permitting examination in numerous different planes. Contrast and Doppler echocardiography have allowed visualization of the blood pool and resulting flow patterns within the cardiac chambers and vessels, and provided flow information in simple and complex congenital heart defects. Structure identification, qualitative and quantitative evaluation of shunts, estimation of gradients, and assessment of pulmonary hypertension have been made available. Refinements of the techniques are currently being developed, and, in selected cases, cardiac catheterization may be obviated. Future developments certainly will improve the capabilities of echocardiography by providing a more accurate noninvasive, morpho-functional assessment of congenital heart disease
Quantification of regurgitant jets by color Doppler echocardiography: Theory and practice
No full textQuantitation of valvar regurgitation is still a challenge in clinical and research cardiology. The early enthusiasm for a simple quantification of jet area by color Doppler imaging has yielded to a realization that the appearance of regurgitant jets is a complex process, dependent on many physical, geometric and instrument factors. Determinants of color Doppler regurgitant jets are discussed and some new quantitative promising methods for a more accurate estimation of severity of valvular regurgitation are described
Ecocardiografia tridimensionale: principi generali ed applicazioni cliniche (con particolare riferimento alle cardiopatie congenite).
No full textMethods of three-dimensional reconstruction of cardiac images and emerging clinical applications are described, with special reference to congenital heart disease. Compared to other techniques providing dynamic three-dimensional visualization of heart structures, echocardiography has advantages of better temporal resolution and minor cost. Current applications include assessment of volumes and global and regional ventricular performance, evaluation of time motion of valves and other dynamic processes together with color-flow images, and dissection of the heart into specific areas of interest, such as atrial septum, mitral inflow and aortic outflow. In complex congenital heart disease, three-dimensional reconstruction provides an interpretation of the mode of atrioventricular and ventriculoarterial connections, with simulations of a "surgeon's view" of the heart. Defects as atrioventricular canal, double inlet left ventricle and tricuspid atresia can be examined in details concerning the architecture of valvar and subvalvar apparatus and presence and importance of ventricular septal defect. Other congenital malformations such as transposition of great arteries, truncus, coarctation syndrome, and double outlet right ventricle can be assessed in regard to interventricular communication and infundibular obstruction. Multiplane transesophageal probes are best suitable to this sort of electronic vivisection, but rotational and linear scanning methods have also given useful images of cardiac structures in children as well as adults. Validation studies are in progress on the reliability of a number of quantitative parameters that can be derived from the three-dimensional data set
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