Reference Values for Right Ventricular Volumes and Ejection Fraction With Real-Time Three-Dimensional Echocardiography: Evaluation in a Large Series of Normal Subjects
ABSTRACT The quantification of right ventricular (RV) size and function is of diagnostic and prognostic importance. Recently, new software for the analysis of RV geometry using three-dimensional (3D) echocardiographic images has been validated. The aim of this study was to provide normal reference values for RV volumes and function using this technique.
A total of 245 subjects, including 15 to 20 subjects for each gender and age decile, were studied. Dedicated 3D acquisitions of the right ventricle were obtained in all subjects.
The mean RV end-diastolic and end-systolic volumes were 49 +/- 10 and 16 +/- 6 mL/m2 respectively, and the mean RV ejection fraction was 67 +/- 8%. Significant correlations were observed between RV parameters and body surface area. Normalized RV volumes were significantly correlated with age and gender. RV ejection fractions were lower in men, but differences across age deciles were not evident.
The current study provides normal reference values for RV volumes and function that may be useful for the identification of clinical abnormalities.
Conference Paper: Invariant perception for symmetry related patterns[Show abstract] [Hide abstract]
ABSTRACT: A powerful tool for handling configuration-space symmetries is presented. The authors have succeeded in devising a map that allows any neural network dynamics to be implemented on whole classes of equivalence under an arbitrary symmetry group. In certain maps part of the convergence of a pattern toward a memory is accomplished by the map itself. The authors believe this approach could eventually permit the whole process of recognition to be done at this stage for a wide enough radius of attraction.< >Neural Networks, 1989. IJCNN., International Joint Conference on; 02/1989
Conference Paper: TDX-10: a flexible switching architecture for ISDN[Show abstract] [Hide abstract]
ABSTRACT: The switching system in the integrated services digital network (ISDN) supports the exchange of user information, which may be voice or data. Also the system provides the interworking facilities to communicate with existing networks until they are replaced by ISDN. The TDX-10 is an advanced switching system suitable for advanced networks, including ISDN. The author gives the architecture and ISDN design concepts of the TDX-10 switching systemTENCON '89. Fourth IEEE Region 10 International Conference; 12/1989
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ABSTRACT: The metabolism of 14C-acetate was investigated during the in vitro germination of yellow lupine seeds. Carbon atoms (14C) from the C-2 position of acetate were incorporated mainly into amino acids: aspartate, glutamate, and glutamine and into sugars: glucose, sucrose, and fructose. In contrast to this, 14C from the C-1 position of acetate was released mainly as 14CO2. Incorporation of 1-14C and 2-14C from acetate into amino acids and sugars in seedling axes was more intense when sucrose was added to the medium. However, in cotyledons where lipids are converted to carbohydrates, this process was inhibited by exogenous sucrose. Since acetate is the product of fatty acid beta-oxidation, our results indicate that, at least in lupine, seed storage lipids can be converted not only to sucrose, but mainly to amino acids. Inhibitory effects of sucrose on the incorporation of 14C from acetate into amino acids and sugars in cotyledons of lupine seedlings may be explained as the effect of regulation of the glyoxylate cycle by sugars.Journal of Plant Physiology 06/2003; 160(5):539-545. DOI:10.1078/0176-1617-00763 · 2.77 Impact Factor