In valvular hea disease complicating pregnancy the following statements are true except :
Open hea surgery is associated with a reduction in fetal loss
A closed mitral valvotomy can be carried out if symptoms of mitral stenosis are severe
Open hea surgery is associated with a reduction in fetal loss
Mitral regurgitation is usually well tolerated
A maternal moality of 15% has been repoed in women with critical aoic stenosis