Preeclampsia is a pregnancy-specific condition marked by high blood pressure and signs of organ stress that usually begins after 20 weeks. For the baby, its main danger is placental insufficiency: a placenta that can’t deliver enough oxygen and nutrients. In severe or untreated cases, this can lead to fetal distress, growth restriction, preterm birth, and hypoxic-ischemic encephalopathy (HIE). If you are pregnant and have just been told you have preeclampsia, or if your baby developed HIE after a preeclampsia pregnancy, this guide explains how the two are connected and what appropriate care looks like.
What Preeclampsia Is (and Isn’t)
Preeclampsia is defined by new-onset high blood pressure after 20 weeks of gestation (at least 140/90 mmHg on two readings at least 4 hours apart), combined with either proteinuria (protein in the urine) or other evidence that the condition is affecting maternal organs. It is not just “high blood pressure in pregnancy.” It is a systemic disorder that originates in the placenta and can affect the kidneys, liver, brain, blood platelets, and blood vessels of the mother, as well as the oxygen supply to the baby.
Preeclampsia exists on a spectrum. Preeclampsia without severe features is typically managed expectantly until 37 weeks under continuous monitoring. Preeclampsia with severe features carries higher maternal and fetal risk and is delivered earlier. HELLP syndrome (Hemolysis, Elevated Liver enzymes, Low Platelets) and eclampsia (preeclampsia complicated by seizures) are severe variants that usually require immediate delivery.
Two related conditions are often confused with preeclampsia but are clinically distinct. Gestational hypertension is new high blood pressure after 20 weeks without proteinuria or other signs of organ involvement; it can progress to preeclampsia and warrants close surveillance. Chronic hypertension is high blood pressure that existed before pregnancy or was first detected before 20 weeks. A woman with chronic hypertension who develops worsening blood pressure or new signs of organ stress after 20 weeks is diagnosed with superimposed preeclampsia, which carries the highest fetal risk of the three.
How Preeclampsia Affects the Baby’s Brain
The baby’s brain is not injured directly by the mother’s high blood pressure. The damage pathway runs through the placenta. Preeclampsia is thought to begin with abnormal placental development early in pregnancy, which leads to reduced blood flow through the placenta throughout the rest of the pregnancy. The downstream consequences include:
- Chronic placental insufficiency restricts oxygen and nutrient delivery to the baby, leading to intrauterine growth restriction (IUGR) and low amniotic fluid (oligohydramnios).
- Placental abruption (premature separation of the placenta) occurs more often in preeclamptic pregnancies and can cause sudden, severe fetal oxygen deprivation.
- Preterm delivery is more common, and prematurity itself is a significant risk factor for HIE, periventricular leukomalacia (PVL), and cerebral palsy.
- Acute fetal distress during labor can occur if the already-compromised placenta cannot handle the stress of uterine contractions.
In the most severe cases, these factors can combine to produce HIE at birth. A 2011 review in the Journal of Pregnancy by Backes and colleagues documented meaningfully higher rates of adverse neurodevelopmental outcomes in babies born after preeclamptic pregnancies.
HELLP syndrome and eclampsia: the highest-risk variants
Two severe forms of preeclampsia deserve specific attention because they drive a disproportionate share of neonatal HIE cases. HELLP syndrome (Hemolysis, Elevated Liver enzymes, Low Platelets) can develop suddenly, often without the classic blood pressure elevation early on. The combination of liver dysfunction, low platelets, and breakdown of red blood cells increases the risk of placental abruption, maternal stroke, and sudden fetal compromise. Eclampsia is preeclampsia complicated by seizures and is a medical emergency; uncontrolled maternal seizures can cause maternal hypoxia and further reduce oxygen to the baby. Both HELLP and eclampsia generally require prompt delivery, and both are associated with higher rates of neonatal resuscitation and NICU admission.
Signs Every Expecting Mother Should Recognize
The symptoms below, especially when they appear together or suddenly, warrant immediate evaluation. These are the signs ACOG lists as concerning for severe features:
| Symptom | What It Can Signal | Severity |
|---|---|---|
| Blood pressure 160/110 mmHg or higher | Severe-range hypertension; risk of stroke, abruption | Severe |
| Severe headache not relieved by acetaminophen | Cerebral involvement | Severe |
| Visual changes (blurred vision, scotomata) | Cerebral or retinal involvement | Severe |
| Right upper quadrant or epigastric pain | Liver involvement, possible HELLP | Severe |
| Sudden swelling of face, hands, or feet | Fluid retention; new-onset edema | Warning |
| Decreased fetal movement | Possible fetal compromise | Severe |
| Shortness of breath | Possible pulmonary edema | Severe |
If you experience any of these, call your obstetric provider or go to labor and delivery. Preeclampsia can worsen quickly, and evaluation should not wait for your next routine appointment.
The delivery timing and fetal monitoring record are usually where answers begin. Free, confidential case review.
How Preeclampsia Should Be Managed
ACOG Practice Bulletin 222 (2020) outlines the evidence-based approach. The four pillars of care are blood pressure control, seizure prophylaxis in severe cases, fetal surveillance, and planned delivery at the appropriate gestational age.
When Preeclampsia Becomes a Birth Injury Case
Preeclampsia itself is not negligence. It develops despite good prenatal care. What can constitute negligence is the response to it. A case may warrant review when the record shows one or more of the following:
- Failure to diagnose preeclampsia despite clear blood pressure readings or lab abnormalities across multiple visits.
- Failure to identify severe features (severe-range blood pressure, falling platelets, rising liver enzymes, persistent headache) that should have triggered hospitalization.
- Failure to administer magnesium sulfate when indicated, leading to eclampsia seizures.
- Failure to expedite delivery when severe features, non-reassuring fetal status, or HELLP were present.
- Inadequate fetal surveillance in a pregnancy with known preeclampsia and IUGR.
- Failure to recognize placental abruption (sudden abdominal pain, bleeding, fetal decelerations) during labor.
- Failure to initiate therapeutic hypothermia within 6 hours of birth if the baby met HIE criteria.
A thorough case review examines the entire prenatal and delivery record (blood pressure logs, lab results, ultrasound reports, fetal monitoring strips, medication records, delivery notes, and the neonatal course) to determine whether the response met current ACOG standards.
What to gather before a case review
If you are preparing to have a preeclampsia-related HIE outcome reviewed, the records that matter most often span the full pregnancy. Request from your providers and hospital:
- All prenatal visit notes, including every blood pressure measurement and urine protein result.
- All laboratory results (platelets, liver enzymes, creatinine, urine protein, uric acid, hemoglobin).
- All ultrasound reports, especially growth scans, amniotic fluid volume, and umbilical artery Doppler studies.
- All non-stress tests and biophysical profiles.
- The complete labor and delivery record, including fetal heart rate tracings, medication administration times, and any magnesium sulfate documentation.
- Cord blood gas results and the neonatal resuscitation record.
- Placental pathology, which is particularly informative in preeclampsia cases.
- The NICU admission note, daily notes, and discharge summary.
Most preeclampsia outcomes are managed well. When HIE results, the prenatal record usually tells the story. We can help you read it.
Related reading for parents
If you are researching preeclampsia and its connection to HIE, these related guides will help:
- Placental insufficiency and HIE: when the placenta fails before delivery
- Chorioamnionitis and HIE: how infection in the womb causes newborn brain injury
- Cord blood gas results explained: pH, base deficit, and what they mean for HIE
- Who qualifies for therapeutic cooling? HIE eligibility criteria explained
- Does prolonged labor cause HIE? What the research really shows
Our team helps families in 38 states determine whether an HIE outcome after preeclampsia was preventable. No cost. Answers first.