Preeclampsia and High Blood Pressure During Pregnancy (cont.)
IN THIS ARTICLE
At the first sign of high blood pressure during pregnancy, your health professional cannot predict whether it will remain mild, become severe, or turn out to be an early sign of preeclampsia. If you are developing preeclampsia, your urine test (urine screen) will probably show increased protein levels before long. This sign that your kidneys are being affected by the condition doesn't develop right away.
If you aren't certain that you had normal blood pressure before pregnancy, it is possible that you have preexisting chronic high blood pressure. If so, your blood pressure may remain high after your pregnancy.
High blood pressure that develops during pregnancy
High blood pressure that develops before the 20th week of pregnancy is usually a sign of ongoing (chronic) high blood pressure or short-term, mild high blood pressure. In rare cases, it is an early sign of preeclampsia.
High blood pressure that occurs after midpregnancy could be a sign that you are developing preeclampsia. This can be anytime after the 20th week.
Chronic high blood pressure and pregnancy
Women with chronic high blood pressure (hypertension) who become pregnant normally have a drop in blood pressure during the first two trimesters. During the late second or in the third trimester, however, blood pressure returns to higher-than-normal levels. Following delivery, their blood pressure remains high. For more information, see the topic High Blood Pressure.
Chronic high blood pressure increases your risk of preeclampsia during pregnancy.
Most women with chronic high blood pressure who are otherwise healthy have a low risk for other cardiovascular problems during pregnancy.
Women with chronic high blood pressure have an increased risk of the premature separation of the placenta from the uterine wall (placenta abruptio). This risk may increase when:
Preeclampsia affects your blood pressure, placenta, liver, blood, kidneys, and brain. Preeclampsia can be mild or severe, and it may get worse gradually or rapidly. Both you and your fetus can potentially suffer life-threatening problems involving the following:
Delivery of the baby and placenta is the only "cure" for preeclampsia. If your condition becomes dangerous enough that delivery is necessary but you don't go into labor, your doctor will induce labor or surgically deliver the baby (cesarean section). Unless you have chronic high blood pressure, your blood pressure should return to normal in a few days. In severe cases, this can take 6 or more weeks.
The earlier in the pregnancy that preeclampsia begins and/or the more severe the condition becomes, the greater the risk of preterm birth, which can cause newborn problems. For more information, see the topic Premature Infant.
An infant born before 37 weeks may have difficulty breathing because of immature lungs (respiratory distress syndrome). A newborn affected by preeclampsia may also be smaller than normal (intrauterine growth restriction). This is because of inadequate nutrition from poor blood flow through the placenta.
eMedicineHealth Medical Reference from Healthwise
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