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J Vet Cardiol ; 41: 70-78, 2022 Jun.
Article in English | MEDLINE | ID: mdl-35248977

ABSTRACT

Trifoliate left atrioventricular (AV) valve with common atrioventricular junction is considered part of the spectrum of atrioventricular septal defect. This valve morphology is typically associated with defects in the AV septum resulting in communication at the atrial or ventricular level, but has also been described as an isolated defect in the setting of a common AV junction without AV septal defect. Trifoliate left AV valve exhibits a line of apposition between the bridging leaflets that is directed toward the inlet interventricular septum, distinguishing it from isolated mitral valve cleft in which the orientation of the bridging leaflets are toward the left ventricular outflow tract. The echocardiographic findings of four dogs with trifoliate left AV valve are described; two with intact septal structures and two with large ostium primum defects. Three dogs underwent open surgical repair using different approaches depending on the presence or absence of a septal defect. One of these underwent concurrent surgical repair for right AV valve dysplasia. One dog with intact septal structures underwent interventional closure of a concurrent patent ductus arteriosus. Current terminology associated with trileaflet left AV valve malformations is reviewed.


Subject(s)
Dog Diseases , Heart Septal Defects, Atrial , Heart Septal Defects, Ventricular , Heart Valve Diseases , Animals , Dog Diseases/diagnostic imaging , Dog Diseases/surgery , Dogs , Echocardiography/methods , Echocardiography/veterinary , Heart Septal Defects , Heart Septal Defects, Atrial/diagnostic imaging , Heart Septal Defects, Atrial/surgery , Heart Septal Defects, Atrial/veterinary , Heart Septal Defects, Ventricular/diagnostic imaging , Heart Septal Defects, Ventricular/surgery , Heart Septal Defects, Ventricular/veterinary , Heart Valve Diseases/veterinary , Mitral Valve/surgery
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