True about hea disease in pregnancy

Mitral stenosis : Cardiac surgery is best done before pregnancy; If needed Balloon valvuloplasty is the preferred procedure in second trimester MR is well tolerated in pregnancy because the decreased systemic vascular resistance results in less regurgitation Aoic stenosisis essentially a disease of ageing and hence rare in pregnancy unless associated with congenital lesion like bicuspid aoic valve Termination of pregnancy advised in NYHA class 3 and 4 Reference: Textbook of Obstetrics; Sheila Balakrishnan, 2nd edition; Page no: 236