Cardiographic Impedance
Mostrando 1-3 de 3 artigos, teses e dissertações.
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1. STUDY AND DEVELOPMENT DE UMA FAMILY OF Not LINEAR ALGORITHMS FOR FILTERING ADAPTATIVE / ESTUDO E DESENVOLVIMENTO DE UMA FAMILIA DE ALGORITMOS NÃO LINEARES PARA FILTRAGEM ADAPTATIVA
In this work we develop a family of adaptive algorithms based on nonlinear functions as a criterion to be applied upon the error, that we want to minimize. Such a development is based upon the use of high order statistics to obtain additional information of the signals involved in the process, intending to enhance the adaptive filtering performance. We deriv
Publicado em: 2006
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2. Mitral regurgitation and characteristic changes in impedance cardiogram.
We have noted that the impedance cardiographic waveform of patients with mitral regurgitation may show typical abnormalities not found in other forms of cardiac disease, either valvular or congenital. In order to investigate this we reviewed the impedance cardiograms of all our patients who had also undergone cardiac catheterisation, and selected two groups
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3. Effect of aortic valvular regurgitation upon the impedance cardiogram.
The first derivative thoracic impedance cardiogram, phonocardiogram, and electrocardiogram were recorded in three groups of 22 subjects each. In Group 1 (control), simultaneous impedance cardiogram, phonocardiogram, and aortic valve echocardiograms showed that the X point of the impedance cardiogram occurred synchronously with the aortic second heart sound a