What is Pre-eclampsia

Pre-eclampsia is a serious pregnancy complication characterized by high blood pressure and signs of damage to another organ system, most commonly the liver and kidneys. It typically begins after 20 weeks of pregnancy and requires careful medical monitoring to ensure the safety of both the birthing parent and the developing fetus.

What is pre-eclampsia and how does it affect the body?

Pre-eclampsia is a multisystem disorder that primarily impacts the cardiovascular system. While high blood pressure (hypertension) is the hallmark sign, pre-eclampsia can cause systemic inflammation and vascular dysfunction. When the blood vessels do not function properly, it can lead to reduced blood flow to the placenta, potentially restricting the fetus's oxygen and nutrient supply. Furthermore, pre-eclampsia often affects the kidneys (leading to protein in the urine) and the liver (causing elevated enzymes), and in severe cases, it can impact the brain, leading to headaches, vision changes, or seizures (a condition known as eclampsia).

How common is pre-eclampsia and who is at risk?

Globally, pre-eclampsia affects approximately 2% to 8% of all pregnancies. It is most commonly diagnosed in the third trimester, though it can occur as early as 20 weeks gestation. While any pregnant individual can develop the condition, certain factors increase the risk, including:

• First-time pregnancies


• A personal or family history of pre-eclampsia


• Chronic hypertension, kidney disease, or diabetes


• Multiple gestations (e.g., twins or triplets)


• Advanced maternal age (typically over 40) or very young maternal age

What is the underlying mechanism of pre-eclampsia?

The exact cause of pre-eclampsia remains a subject of intense research, but the primary mechanism is believed to involve the placenta. In a healthy pregnancy, new blood vessels develop to efficiently send blood to the placenta. In cases of pre-eclampsia, these vessels do not form or function correctly, often due to an abnormal immune response or incomplete implantation. This leads to placental ischemia (a lack of blood flow), which triggers the release of proteins into the mother’s bloodstream that damage the lining of her blood vessels, resulting in systemic hypertension.

How is pre-eclampsia different from chronic hypertension?

It is vital to distinguish pre-eclampsia from chronic hypertension. Chronic hypertension is high blood pressure present before pregnancy or diagnosed before 20 weeks. In contrast, pre-eclampsia is specifically pregnancy-induced and typically resolves after the delivery of the placenta. At DiseaseMaps.org, we have seen 80 members share their experiences with this condition, highlighting the importance of early detection and specialized obstetric care.

Next steps

• Contact your obstetrician immediately if you experience severe headaches, sudden swelling in your hands or face, or upper abdominal pain.


• Monitor your blood pressure regularly as directed by your healthcare provider.


• Connect with the community at DiseaseMaps.org to read stories from others who have navigated pregnancy with high-risk conditions.


• Consult with a maternal-fetal medicine (MFM) specialist if you have a history of pregnancy complications.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Pre-eclampsia Overview.


• Orphanet: Rare diseases and pregnancy complications database.


• The Preeclampsia Foundation: Patient education and clinical resources.


• PubMed/NCBI: Current clinical guidelines on the management of hypertensive disorders of pregnancy.