Coronary sinus atresia is usually a congenital anomaly. Sometimes it is acquired, due to an AV fistula involving the middle cardiac vein which becomes grossly enlarged and impinges
Concertina effect in WPW syndrome is varying QRS width in WPW syndrome due to varying degrees of pre-excitation. More the pre-excitation, shorter the PR and wider the QRS.
Minimal luminal diameter (MLD) at the end of the procedure minus the minimal luminal diameter at the repeat angiogram, generally at 6 months is taken as the late
Candidates for tissue valve (bioprosthetic) replacement: elderly, females planning pregnancy, following infective endocarditis and right sided valve disease