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HELLP Syndrome: Causes, Symptoms and Treatment

HELLP syndrome is a life-threatening pregnancy complication involving hemolysis, elevated liver enzymes, and low platelets. Prompt diagnosis is critical for mother and child.

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HELLP syndrome is a life-threatening pregnancy complication involving hemolysis, elevated liver enzymes, and low platelets. Prompt diagnosis is critical for mother and child.

What is HELLP Syndrome?

HELLP syndrome is a severe and potentially life-threatening complication of pregnancy that most commonly occurs in the third trimester but can also develop shortly after delivery. The name is an acronym standing for: Hemolysis, Elevated Liver enzymes, and Low Platelets. It represents a medical emergency requiring immediate hospital care. HELLP syndrome affects approximately 0.1 to 0.6 percent of all pregnancies and is one of the leading causes of maternal morbidity and mortality in obstetrics.

Causes and Risk Factors

The exact cause of HELLP syndrome is not yet fully understood. It is widely regarded as a severe variant of preeclampsia -- a condition defined by high blood pressure and protein in the urine during pregnancy. Impaired placental blood flow and abnormal adaptation of blood vessels are considered key triggers of the underlying pathophysiology.

Known risk factors include:

Previous preeclampsia or a prior episode of HELLP syndrome
Multiple pregnancies (twins or more)
Chronic high blood pressure or kidney disease
First-time pregnancies and maternal age over 35
Diabetes mellitus
Obesity

Symptoms

The symptoms of HELLP syndrome can be vague and non-specific, which makes early diagnosis challenging. Common complaints include:

Upper abdominal pain, particularly in the right upper quadrant or epigastric region
Nausea and vomiting
Severe headaches
General malaise and profound fatigue
Visual disturbances such as blurred vision or seeing spots
Edema (swelling), especially of the face and hands

Because these symptoms can resemble other conditions, rapid laboratory testing is essential for accurate diagnosis.

Diagnosis

HELLP syndrome is diagnosed primarily through blood tests. The characteristic findings are:

Hemolysis: Breakdown of red blood cells, evidenced by elevated LDH (lactate dehydrogenase), elevated bilirubin, and low hemoglobin
Elevated liver enzymes: Increased AST (aspartate aminotransferase) and ALT (alanine aminotransferase)
Thrombocytopenia: Platelet count below 100,000 per microliter of blood

In addition, blood pressure, urinary protein levels, and the well-being of the unborn baby are monitored closely using ultrasound and cardiotocography (CTG).

Treatment

The only definitive treatment for HELLP syndrome is delivery of the baby. Depending on the severity of the condition and gestational age, labor is induced or a cesarean section is performed as soon as it is safe to do so.

Medical Interventions

Magnesium sulfate: Administered to prevent eclamptic seizures
Antihypertensive medications: Used to lower dangerously high blood pressure and stabilize circulation
Corticosteroids: Used in some cases to accelerate fetal lung maturity and to temporarily improve the maternal platelet count
Blood products: Transfusion of platelet concentrates or fresh frozen plasma may be necessary in cases of very low platelet counts or signs of bleeding

Intensive Monitoring and Critical Care

Women with HELLP syndrome are closely monitored in an intensive care unit or a specialized obstetric unit. Serious complications such as acute kidney failure, liver hematoma (bleeding into the liver), or disseminated intravascular coagulation (DIC) must be identified and treated promptly.

Prognosis and Follow-Up

With early detection and appropriate treatment, most women recover fully from HELLP syndrome. The risk of recurrence in a subsequent pregnancy is estimated at approximately 3 to 25 percent. Women with a history of HELLP syndrome should receive close medical supervision in future pregnancies and are generally advised to take low-dose aspirin (acetylsalicylic acid) from early pregnancy onward as prophylaxis against preeclampsia.

References

Lim, K.H. - HELLP Syndrome. UpToDate, 2023. Available at: www.uptodate.com
American College of Obstetricians and Gynecologists (ACOG) - Gestational Hypertension and Preeclampsia. ACOG Practice Bulletin No. 222, 2020.
Sibai, B.M. - Diagnosis, controversies, and management of the syndrome of hemolysis, elevated liver enzymes, and low platelet count. Obstetrics & Gynecology, 2004; 103(5):981-991.

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