title: [Study of the descending phase of the aortic pressure curve. Possible applications to the monitoring of peripheral resistance and arterial compliance (author's transl)].
abstract: In 21 patients aortic pressure was recorded just above the diaphragm. The curve after the dicrotic notch is an exponential function of the time, and it is possible to characterize it by a unique time-constant. This constnat is shown to depend on aortic compliance and peripheral resistance: as aortic compliance does not vary abruptly in physiological conditions, this allows monitoring of peripheral resistance by monitoring time constant. Mathematical bases of time constant and of the peripheral resistance are briefly discussed.
mesh_terms: D001158:Arteries / Q000502:physiology*; D001795:Blood Pressure Determination; D002302:Cardiac Output; D005069:Evaluation Studies as Topic; D006801:Humans; D008433:Mathematics; D008991:Monitoring, Physiologic; D012044:Regression Analysis; D014655:Vascular Resistance
vernacular_title: Studio della fase discendente della curva di pressione aortica. Sue possibili applicazioni alla misura della resistenza periferica e della compliance arteriosa