The document discusses heart diseases that can occur during pregnancy. Some key points: - The incidence of heart disease during pregnancy is around 1%, which can be either congenital or acquired. The most common acquired heart diseases in developing countries are rheumatic heart disease, cardiomyopathies, and ischemic heart disease. - The cardiac output and blood volume increase significantly during pregnancy to support the growing fetus. This peaks around weeks 30-34 and causes things like a systolic murmur. - Women are at highest risk of cardiac decompensation between weeks 12-16, 28-32, during labor/delivery, and the first few days after delivery due to hemodynamic changes. - Risk of maternal