Evaluation of the elasticity and characteristic impedance of the ascending aorta in man.
In 30 patients, simultaneous measurements of ascending aortic pressure and diameter were performed, allowing one to evaluate: (1) the influence of age, the aortic diastolic pressure, and the radius on the aortic elasticity; (2) the correlations between characteristics impedance of the aorta (Zo), systemic arterial resistance, age and diastolic aortic pressure; and (3) the importance of Zo when comparing two indices of left ventricle performance; one during isovolumic phase ([dP/dt]/Pt)max and the other during the outflow phase (maximum acceleration of aortic blood flow).
D000328:Adult; D000375:Aging; D001011:Aorta / Q000502:physiology* / Q000503:physiopathology; D001022:Aortic Valve Insufficiency / Q000503:physiopathology; D004548:Elasticity; D005260:Female; D006321:Heart / Q000502:physiology / Q000503:physiopathology; D006801:Humans; D006973:Hypertension / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D014655:Vascular Resistance