title: Echocardiographic features of the normal and malfunctioning porcine xenograft valve.
mesh_terms: D000328:Adult; D000818:Animals; D004452:Echocardiography; D005260:Female; D006351:Heart Valves / Q000502:physiology / Q000503:physiopathology / Q000637:transplantation*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013552:Swine; D014183:Transplantation, Heterologous