The Risk Factors of Mitral Regurgitation Deterioration After Secundum Atrial Septal Defect Closure.

Background: Association between secundum Atrial Septal Defect (ASD) and mitral valve (MV) disease has been recognized for decades. Secundum ASD closure can reduce mitral regurgitation (MR) degree. However, in some patients, deterioration of MR after ASD closure has been observed.