title: Effects of dobutamine on aortic valve indexes in asymptomatic patients with bileaflet mechanical prostheses in the aortic valve position.
abstract: We investigated the effects of alternating transvalvular flow rate on Doppler-derived aortic valve resistance and valve area in asymptomatic patients with mechanical aortic valve replacement under dobutamine infusion. The Gorlin-derived aortic valve area and continuity equation-derived aortic valve area seem to be less flow dependent; valve resistance tends to be flow dependent.
authors.affiliation: Center for Cardiovascular Research, College of Medicine, National Taiwan University, Taipei.
authors.forename: C H
authors.initials: CH
authors.lastname: Tsai
authors.forename: T M
authors.initials: TM
authors.lastname: Lee
authors.forename: C H
authors.initials: CH
authors.lastname: Wang
authors.forename: K L
authors.initials: KL
authors.lastname: Hsu
authors.forename: C S
authors.initials: CS
authors.lastname: Liau
authors.forename: Y T
authors.initials: YT
authors.lastname: Lee
authors.forename: S H
authors.initials: SH
authors.lastname: Chu
mesh_terms: D000318:Adrenergic beta-Agonists / Q000494:pharmacology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001021:Aortic Valve / Q000000981:diagnostic imaging / Q000187:drug effects* / Q000503:physiopathology*; D001783:Blood Flow Velocity / Q000187:drug effects; D004280:Dobutamine / Q000494:pharmacology*; D015150:Echocardiography, Doppler; D005260:Female; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D000318:Adrenergic beta-Agonists; D004280:Dobutamine