Patient's question:
I am a pregnant woman with RH negative O blood type. My husband is O positive. I am currently 4 months pregnant. In the past, I had an induced abortion for a fetus (around 45 days) without knowing that I was RH negative. I don't know if this baby will develop hemolysis. If it does, what should I do?Doctor's answer:
Okay, here is the English translation, following your instructions:Causes of hemolytic disease of the newborn include Rh and ABO blood group incompatibilities. Rh incompatibility occurs when the mother is Rh negative, the father is Rh positive, and the fetus is Rh positive. This is because the fetus inherits dominant antigens from the father, which enter the mother's bloodstream during pregnancy, abortion, or delivery. The mother then produces antibodies against these antigens. When these antibodies cross the placenta into the fetus, they destroy and agglutinate the fetal red blood cells, causing severe hemolysis in the newborn. ABO incompatibility occurs when the mother is type O blood and the father is type A, B, or AB blood. If the fetus is type A or B blood, ABO incompatibility develops, which is clinically known as ABO hemolytic disease. This is because fetal red blood cells entering the mother's blood stimulate her to produce corresponding antibodies. When the amount of antibodies in the fetus reaches a certain level, an antigen-antibody reaction occurs, leading to massive destruction of red blood cells and causing hemolytic disease of the newborn. This condition often occurs rapidly within hours after birth. The infant may show progressive jaundice, anemia, lethargy, poor feeding, vomiting, and even convulsions. Medically, this is known as kernicterus. Severe cases can lead to death within 3-5 days. Survivors, even after treatment, often suffer from sequelae such as intellectual and motor dysfunction. Severe hemolysis during the fetal period can cause miscarriage, preterm birth, or stillbirth. Therefore, it is necessary to determine the blood types of both parents during prenatal examinations. If the pregnant woman is type O blood and the father is non-O type, it is necessary to further check the mother's serum antibody levels. When the antibody level reaches a certain concentration, appropriate preventive measures should be taken, including administering large doses of vitamins B, C, and E, and folic acid to the pregnant woman, along with treatments like glucose and oxygen, to protect fetal red blood cells, promote red blood cell proliferation and repair, enhance the fetus's resistance, reduce maternal antibody levels, and simultaneously strengthen the placental barrier to prevent immune antibodies from entering the fetus. Clinically, it has also been observed that traditional Chinese medicine methods for invigorating blood and removing stasis can help reduce maternal antibody levels. Intrauterine fetal blood transfusion, and if appropriate, timely termination of pregnancy, allowing the fetus to be saved by early detachment from the dangerous situation, are also effective measures. Women suspected of having potential neonatal hemolysis, such as those with a history of stillbirth, fetal death, or neonatal hemolysis, must undergo blood antibody titer testing during subsequent pregnancies. If the ABO incompatibility antibody titer reaches 1:512 or the Rh incompatibility antibody titer reaches 1:32 or higher, it indicates a severe condition that requires timely management. Generally, pregnant women with blood group incompatibility should undergo regular monitoring at a specialized hospital to prevent and minimize harm.