Factors affecting the outcome of pregnancy with rheumatic heart disease: an experience from low-middle income country.

Studies on pregnancy with rheumatic heart disease (RHD), still common in the developing world, are relatively old and small. This retrospective study was conducted to study the outcome of pregnancy in women with RHD and factors associated with poor outcome. We studied 353 pregnancies in 273 women. In 35% of the patients, the diagnosis was first made during index pregnancy. Women with severe MS had lesser gestational age at delivery and birth weight than those with mild-to-moderate MS. Women with NYHA III-IV status delivered at lesser gestational age had lesser birth weight and had higher perinatal and maternal mortality than NYHA I-II status. Pregnancy outcome was better among women who underwent Balloon mitral valvotomy (BMV) when indicated than those who did not. Cardiac complications were higher in women with severe MS and poor NYHA status. Early booking is important for the optimal outcome. BMV is safe during pregnancy and should be done when necessary. Impact statement What is already known on this subject? Rheumatic heart disease continues to be the major cause of maternal morbidity and mortality in developing countries. Most of the recent studies discuss pregnancy with heart disease as a whole with RHD being a part. What do the results of this study add? A large number of women in developing countries conceive with unknown underlying heart disease. Late access to antenatal care is associated with poor outcome. Cardiac and obstetric complications are significantly higher in women with severe mitral stenosis and poor NYHA functional status. Balloon mitral valvotomy (BMV) during pregnancy is safe and technically feasible. BMV averts major complications that may occur due to severe disease. Patients with RHD can undergo labour and vaginal delivery under vigilant monitoring. What are the implications for clinical practice? Thorough clinical examination by the clinician at initial visit is important to detect unknown heart disease. Symptoms pointing towards underlying heart disease should prompt evaluation. This study provides evidence for population-based screening for heart disease in women. Optimal management of compensated mitral stenosis requires weighing the risks and benefits of pharmacological therapy versus BMV in the context of maternal condition. BMV should be performed when necessary.