Answer: B

Atrial septal defect often exists alone, sometimes in combination with other malformations. If combined with mitral valve disease, it is also called Lutembacher syndrome (Lutembacher syn-drome). The current Rudenbach syndrome refers to any left-to-right shunt at the atrial level except the atrial septal defect of the foramen primum (including atrial septal defect of the foramen primum, patent foramen ovale, and partial ectopic pulmonary venous drainage). , those combined with mitral valve and device lesions belong to this type of disease. Mitral valve lesions can be congenital or acquired, including stenosis, prolapse, chordae tendineae and papillary muscle dysfunction. Other combined malformations include triatrial heart disease, mitral atresia, Trilogy of Fallot, malformed pulmonary venous drainage, and transposition of the great arteries.