Pregnancy with heart disease is the most likely time for pregnant women to have heart failure

The most likely time for heart failure in pregnant women with heart disease is 32 to 34 weeks of pregnancy, during labor and within 3 days after delivery. 1. At 32 to 34 weeks of pregnancy, the blood volume of pregnant women reaches its peak, and the cardiac load is significantly increased. Fetal growth and development is also in a rapid stage, oxygen demand increases, which will further increase the burden on the pregnant woman's heart, leading to heart function is easy to appear decompensation, thus causing heart failure. 2. During labor, uterine contractions will significantly increase the amount of maternal return blood; during labor, the maternal force holds breath, which will also increase the load of the heart; After the fetus is delivered, abdominal pressure drops sharply, and a large amount of blood rushes to the internal organs. These factors are easy to induce heart failure. 3. Postpartum uterine contraction within 3 days after delivery, a large amount of blood enters the systemic circulation, and at this time, the maternal interstitial fluid will also be absorbed back into the systemic circulation, resulting in a re-increase in circulating blood volume. Factors such as poor postpartum rest and wound pain may also increase the burden on the heart and increase the risk of heart failure.