title: [Passive electrical investigations on the normal and atherosclerotic human aorta in the alpha-dispersion area (author's transl)].
abstract: The passive electrical behaviour of the normal and the atherosclerotic human aorta was investigated at frequencies between 20 Hz and 50 kHz. A distinct alpha-dispersion area with characteristic frequencies of 280 and 104 Hz respectively was found in the normal vessel wall as well as in the atherosclerotic plaques. The confrontation of the passive electrical parameters determined from the curves shows in atherosclerotic plaques an increase of epsilon 0 and a decrease of epsilon infinity compared with the normal aorta. The characteristic frequency f 0 is smaller in atheromas and the relaxation time t 0 is larger accordingly. The distribution parameter alpha is smaller in atherosclerotic plaques. That means that in atheromas the physically defined structures are larger and among one another more similar physically. A connection between the passive electrical parameters and the structural and biochemical compisition of the vessel wall and its pathological changes is discussed.
mesh_terms: D000368:Aged; D001013:Aorta, Thoracic / Q000502:physiology* / Q000503:physiopathology; D001161:Arteriosclerosis / Q000503:physiopathology*; D004594:Electrophysiology; D006801:Humans; D008875:Middle Aged
vernacular_title: Passiv elektrische Untersuchungen an der normalen und der atherosklerotisch veränderten menschlichen Aorta im alpha-Dispersionsgebiet