title: Dysfunction of an On-X Heart Valve by Pannus.
abstract: A 68-year-old woman with a history of previous double-valve replacement with On-X mechanical heart valves presented with clinical, echocardiographic and cardiac catheterization signs of obstruction of the On-X tricuspid heart valve prosthesis. The patient was successfully reoperated, but at surgery the valve was seen to be invaded by an abnormal overgrowth of pannus that blocked one of the leaflets. A small amount of non-obstructive fresh thrombus was also observed. The valve was successfully replaced with a biological heart valve prosthesis. The patient was discharged home, and is doing well four months after the operation, when echocardiography demonstrated normal function in the tricuspid valve. The present case represents the first ever report of pannus formation and subsequent dysfunction in an On-X heart valve, and also the first case of tricuspid valve malfunction and obstruction using this type of heart valve substitute.
authors.affiliation: Cardiac Surgery Service, Hospital Universitario de Gran Canaria Dr. Negrin, Las Palmas de Gran Canaria, Spain. Electronic correspondence: cprnabad2@gmail.com.
authors.forename: Cipriano
authors.initials: C
authors.lastname: Abad
authors.affiliation: Cardiac Surgery Service, Hospital Universitario de Gran Canaria Dr. Negrin, Las Palmas de Gran Canaria, Spain.
authors.forename: Stefano
authors.initials: S
authors.lastname: Urso
authors.affiliation: Pathology Service, Hospital Universitario de Gran Canaria Dr. Negrin, Las Palmas de Gran Canaria, Spain.
authors.forename: Elsa
authors.initials: E
authors.lastname: Gomez
authors.affiliation: Pathology Service, Hospital Universitario de Gran Canaria Dr. Negrin, Las Palmas de Gran Canaria, Spain.
authors.forename: Maria
authors.initials: M
authors.lastname: De la Vega
mesh_terms: D000368:Aged; D001705:Bioprosthesis; D005260:Female; D006349:Heart Valve Diseases / Q000601:surgery*; D006350:Heart Valve Prosthesis; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D008943:Mitral Valve / Q000601:surgery*; D011183:Postoperative Complications / Q000175:diagnosis* / Q000601:surgery; D011475:Prosthesis Failure; D012086:Reoperation; D013927:Thrombosis / Q000175:diagnosis* / Q000601:surgery; D014261:Tricuspid Valve / Q000601:surgery*