title: Application of the continuity equation and valve resistance to the evaluation of St. Jude Medical prosthetic aortic valve dysfunction.
abstract: Doppler echocardiography was applied to the assessment of patients with surgically documented St. Jude medical aortic valve dysfunction. Derivation of effective orifice area and Doppler velocity index with the continuity equation and calculation of valve resistance accurately differentiated stenotic from regurgitant and normal valves.
authors.affiliation: Department of Medicine, Baylor College of Medicine, and The Methodist Hospital Echocardiography Laboratory Houston, Texas 77030, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Saad
authors.forename: J
authors.initials: J
authors.lastname: Barbetseas
authors.forename: L
authors.initials: L
authors.lastname: Olmos
authors.forename: N
authors.initials: N
authors.lastname: Rubio
authors.forename: W A
authors.initials: WA
authors.lastname: Zoghbi
mesh_terms: D001021:Aortic Valve; D001022:Aortic Valve Insufficiency / Q000000981:diagnostic imaging*; D001024:Aortic Valve Stenosis / Q000000981:diagnostic imaging*; D001783:Blood Flow Velocity; D003937:Diagnosis, Differential; D015150:Echocardiography, Doppler; D005260:Female; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation