title: [Dysfunction of aortic mechanical prosthetic valve - difficulties with establishing diagnosis].
abstract: We present 3 cases of the patients with aortic prosthetic valve dysfunction. These cases reflect difficulties with establishing  a proper diagnosis which is crucial in choosing the way and urgency of treatment.
authors.affiliation: Katedra i Klinika Kardiologii, Uniwersytecki Szpital Kliniczny, Białystok. anlila@poczta.onet.pl
authors.forename: Anna
authors.initials: A
authors.lastname: Lisowska
authors.forename: Anna
authors.initials: A
authors.lastname: Tomaszuk-Kazberuk
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Knapp
authors.forename: Bożena
authors.initials: B
authors.lastname: Sobkowicz
mesh_terms: D000328:Adult; D000368:Aged; D001021:Aortic Valve; D000082882:Bicuspid Aortic Valve Disease; D019544:Equipment Failure Analysis / Q000379:methods*; D005260:Female; D006330:Heart Defects, Congenital / Q000628:therapy*; D006349:Heart Valve Diseases / Q000628:therapy*; D006350:Heart Valve Prosthesis / Q000009:adverse effects*; D006801:Humans; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013927:Thrombosis / Q000000981:diagnostic imaging* / Q000209:etiology / Q000628:therapy; D014463:Ultrasonography