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HELLP syndrome
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I now have comprehensive content from four authoritative textbooks. Here is a complete overview:
HELLP Syndrome
What is it?
HELLP is an acronym for Hemolysis, Elevated Liver enzymes, Low Platelets. It is a severe, life-threatening complication of pregnancy - considered a variant of severe preeclampsia, though it can occur in the absence of classic preeclampsia findings like proteinuria or hypertension.
- Incidence: 0.2-0.9% of all pregnancies; 10-20% of women with severe preeclampsia
- Mortality: 7.4-34%
- More common in multigravid patients than primigravidas
When does it occur?
- Most commonly in the third trimester
- 20% of cases occur before week 28 (preterm)
- 30% occur postpartum (up to 7 days after delivery - an important point often missed clinically)
Pathophysiology
The underlying mechanism is microvascular injury - a form of thrombotic microangiopathy (TMA). Key features:
- Abnormal placentation triggers the cascade
- Elevated inflammatory markers: CRP, IL-1Ra, IL-6, soluble HLA-DR
- Elevated FLT1 (VEGF receptor 1) and endoglin (anti-angiogenic factors)
- Complement pathway dysfunction is found in 30-40% of HELLP patients
- Antiphospholipid syndrome increases risk
The liver is the defining organ. The kidneys are also commonly affected (renal failure in ~50% of patients), via TMA with endothelial cell swelling and capillary lumen occlusion.
Clinical Features
Symptoms are often non-specific and easy to misdiagnose:
- Right upper quadrant (RUQ) or epigastric pain - most characteristic (from hepatic ischemia/capsule stretching)
- Nausea and vomiting
- Headache
- Malaise
- Hypertension may be absent in up to ~20% of cases
Because hypertension is often absent and the pain mimics other conditions, HELLP is frequently misdiagnosed as gastroenteritis, cholecystitis, hepatitis, pancreatitis, or pyelonephritis.
Key rule: Any pregnant woman >20 weeks gestation or up to 7 days postpartum presenting with abdominal pain should be evaluated for HELLP syndrome.
Diagnostic Criteria
| Test | Finding |
|---|---|
| Peripheral blood smear | Schistocytes (microangiopathic hemolytic anemia) |
| Platelet count | <100,000/µL (suspicious if <150,000/µL) |
| LDH | >600 U/L (indicates hemolysis) |
| AST/ALT | Elevated but typically <500 U/L (unlike viral hepatitis) |
| Total bilirubin | >1.2 mg/dL |
| Renal function | Normal or elevated BUN/creatinine |
| Coagulation | Abnormal in some |
| Proteinuria | Present in 86-100% of cases |
Diagnostic tip: Liver enzymes >500 U/L or significant hepatic encephalopathy/coagulopathy should prompt consideration of alternative diagnoses like AFLP (Acute Fatty Liver of Pregnancy).
Differential Diagnosis - The Critical Three
A comparison table from Brenner & Rector's The Kidney:
| Feature | HUS/TTP | HELLP | AFLP |
|---|---|---|---|
| Hemolytic anemia | +++ | ++ | ± |
| Thrombocytopenia | +++ | ++ | ± |
| Coagulopathy | - | ± | + |
| CNS symptoms | ++ | ± | ± |
| Renal failure | +++ | + | ++ |
| Hypertension | ± | +++ | ± |
| Elevated AST | ± | ++ | +++ |
| Elevated bilirubin | ++ | + | +++ |
| Ammonia | Normal | Normal | High |
| Effect of delivery | None | Recovery | Recovery |
| Management | Plasma exchange | Supportive + delivery | Supportive + delivery |
Key distinguishing points:
- TTP vs HELLP: ADAMTS13 activity is reduced 30-60% in HELLP but <10% in TTP. The LDH:AST ratio is 13:1 in HELLP with preeclampsia vs 29:1 in non-preeclampsia. Antithrombin III is low in HELLP but not TTP.
- AFLP vs HELLP: AFLP has higher bilirubin, hepatic encephalopathy, coagulopathy, and elevated ammonia. Bilirubin levels are typically higher in AFLP.
Complications
- Disseminated intravascular coagulation (DIC) - 8%
- Placental abruption - 10%
- Pulmonary edema - 10%
- Acute renal failure - 5% (some series report up to 50%)
- Eclampsia - 6%
- Subcapsular hepatic hematoma - rare but catastrophic; can lead to spontaneous liver rupture (right lobe more commonly than left)
- Cerebral infarction, hemorrhage, or edema
- Purtscher-like retinopathy (permanent vision loss)
- Fetal demise
Management
1. Definitive Treatment: Delivery
- Delivery is the key intervention - timing depends on severity and gestational age
- In serious maternal or fetal complications: prompt delivery
- In stable cases without serious complications: antenatal corticosteroids can be given to promote fetal lung maturity, then deliver
2. Seizure Prophylaxis
- Magnesium sulfate IV
3. Antihypertensive Therapy (for severe hypertension)
| Drug | Mechanism | Onset | Dose |
|---|---|---|---|
| Labetalol (preferred) | α and β blockade | 5 min | 20 mg IV, then 40-80 mg IV q10 min (max 300 mg); or 1-2 mg/min infusion |
| Hydralazine | Arterial vasodilator | 20 min | 5 mg IV or 10 mg IM, repeat q20 min (max 20 mg IV) |
| Nifedipine | Calcium channel blocker | 10-20 min | 10 mg PO, repeat in 30 min if needed |
4. What NOT to Do
- Plasma exchange has no benefit in HELLP (but may be indicated if TTP has not been ruled out)
- Eculizumab has been reported effective in a small number of cases, but dosing and indications remain undetermined
5. Postpartum Monitoring
- Lab abnormalities usually improve within 5 days after delivery (may worsen briefly before improving)
- Monitor for postpartum HELLP development (20% of cases occur postpartum)
Postpartum Course
- Usually resolves spontaneously after delivery
- Lab values may paradoxically worsen briefly before normalizing
- Continue monitoring LFTs, platelets, and blood pressure
Sources:
- Harrison's Principles of Internal Medicine, 22nd ed., p. 2490
- Tintinalli's Emergency Medicine: A Comprehensive Study Guide
- Creasy & Resnik's Maternal-Fetal Medicine: Principles and Practice
- Brenner and Rector's The Kidney, 2-Volume Set
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