title: Valve design characteristics and cine-fluoroscopic appearance of five currently available bileaflet prosthetic heart valves.
abstract: Bileaflet prostheses are low profile, central flow orifice devices that show excellent hemodynamic performance and low thrombogenicity. Five models are currently used for heart valve replacement. Comprehensive and comparative studies regarding valve characteristics and functioning are lacking, making the updating and the familiarization by physicians and cardiologists with these prostheses difficult. We describe the valve design characteristics and evaluate the cine-fluoroscopic appearance and functioning of 387 bileaflet prostheses that have been implanted in 367 consecutive patients. The valve types are St Jude Medical (n = 69), Edwards-Duromedics (n = 74), Carbomedics (n = 1290) Sorin Bicarbon (n = 88) and Jyros (n = 27). The prostheses' fluoroscopic appearance was evaluated through multiple radiographic views (Siemens-Elema equipment with C-arm); the prostheses' functional evaluation was performed by obtaining the "tilting disk projection" (ie, with the radiographic beam parallel to both the valve ring plane and the tilting axis of disks) to calculate opening, closing, and travel angles of the disks. This study shows that each of the five bileaflet valves has distinctive design characteristics. Fluoroscopy is an easy, readily available, and useful technique that correctly identifies the prosthesis type and properly evaluates its functioning in the majority of cases.
authors.affiliation: Istituto di Cardiologia dell'Università degli Studi, Centro Cardiologico Fondazione Monzino, IRCCS, Milan, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Montorsi
authors.forename: D
authors.initials: D
authors.lastname: Cavoretto
authors.forename: A
authors.initials: A
authors.lastname: Repossini
authors.forename: A L
authors.initials: AL
authors.lastname: Bartorelli
authors.forename: M D
authors.initials: MD
authors.lastname: Guazzi
mesh_terms: D001021:Aortic Valve; D002933:Cineradiography; D005471:Fluoroscopy; D005500:Follow-Up Studies; D006349:Heart Valve Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D006350:Heart Valve Prosthesis; D006801:Humans; D008943:Mitral Valve; D011182:Postoperative Care; D011474:Prosthesis Design; D013997:Time Factors