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HELLP Syndrome

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HELLP Syndrome, Hemolysis Elevated Liver Enzymes Low Platelets

  • See Also
  1. Preeclampsia
  2. Severe Preeclampsia
  • Definition
  1. Characterized by Hemolysis, elevated liver enzymes, and Low Platelet Count
  2. Variant of Severe Preeclampsia
  • Epidemiology
  1. More common in Multiparous caucasians
  2. More common after age 25 years
  3. Complicates 20% of Severe Preeclampsia cases (but <1% of all pregnancies)
  4. Prevalence: 6 per 1000 deliveries
  5. Onset after 20 weeks gestation
    1. Preterm <27 weeks: 7% of cases
    2. Preterm <37 weeks: 46-52% of cases
    3. Term (37-41 weeks): 14-18% of cases
    4. Postpartum: 30-33% of cases
      1. Typically within 48 hours of delivery
  6. References
    1. Sibai (1993) Am J Obstet Gynecol 169(4): 1000-6 [PubMed]
  • Pathophysiology
  1. Microangiopathic Hemolysis
    1. RBCs fragmented in vessels with damaged endothelium
  2. Fibrin deposition
    1. Vascular deposition contributes to Hemolysis
    2. Hepatic sinusoid deposition with periportal necrosis
      1. Results in liver enzyme abnormalities
  3. Platelet aggregation
  • Risk factors
  1. Advanced maternal age
  2. Caucasian
  3. Multiparity
  4. Preeclampsia
    1. HELLP complicates 12% of Preeclampsia cases overall (20% of Severe Preeclampsia)
    2. However, normal Blood Pressure in up to 18% of cases and no Proteinuria in 13% of cases
  • Precautions
  1. HELLP may present in normotensive patients without Proteinuria
  • Symptoms
  1. Viral-type prodrome
    1. Malaise
  2. Gastrointestinal symptoms (most common)
    1. Right Upper Quadrant Abdominal Pain
    2. Epigastric Pain
    3. Nausea or Vomiting
  3. Other symptoms that are variably present
    1. Headache
    2. Jaundice
  4. Severe Preeclampsia symptoms may be present
  5. Bleeding may occur if Coagulopathy is present
    1. Hematuria
    2. Gastrointestinal Bleeding
  • Signs
  1. Hypertension (85% of cases)
  2. Proteinuria (87% of cases)
  3. Weight gain
  4. Edema
  • Differential Diagnosis
  1. See Right Upper Quadrant Abdominal Pain
  2. See Hemolysis Causes
  3. See Thrombocytopenia
  4. See Aminotransferase
  5. Acute Fatty Liver of Pregnancy
    1. Fatty Liver is associated with more severe liver failure and Renal Insufficiency
    2. HELLP is associated with Severe Hypertension, which is less common in Fatty Liver
  • Diagnosis
  1. Hemolysis
    1. Serum Bilirubin >1.2 mg/dl
    2. Lactate Dehydrogenase >600 IU/L
    3. Peripheral Smear with signs of Hemolysis
      1. Schistocytes
      2. Burr Cells
      3. Helmet Cells
  2. Elevated liver enzymes
    1. Liver transaminases increased (twice normal is a common threshold used)
  3. Low Platelet Count (Thrombocytopenia)
    1. Platelet Count < 100,000 mm3
    2. Low Platelet Count by Alternative Classification
      1. Class 3: Platelet Count 100,000 to 150,000 mm3
      2. Class 2: Platelet Count 50,000 to 100,000 mm3
      3. Class 1: Platelet Count <50,000 mm3
  • Labs
  1. Consider Preeclampsia labs
  2. Complete Blood Count with platelets
  3. Peripheral Blood Smear
  4. Liver panel
    1. Aspartate transaminase (AST)
    2. Alanine transaminase (ALT)
    3. Serum Bilirubin
    4. Lactate Dehydrogenase
  5. Coagulation Factors if platelets <50,000 or bleeding (evaluate for DIC)
    1. Fibrinogen
    2. Fibrin split products
    3. Prothrombin (PT)
    4. Partial Thromboplastin Time (PTT)
  • Management
  1. See Severe Preeclampsia Management
  2. Magnesium Sulfate
    1. Start at admission and continue for 24-48 hours after delivery
  3. Consult maternal fetal medicine
  4. Consider Dexamethasone 10 mg IV q12 hours
    1. Consider when Platelet Count <100,000/mm3
    2. May improve lab abnormalities and delay delivery
    3. Magann (1994) Am J Obstet Gynecol 171:1148-53 [PubMed]
  5. Consider Blood Products
    1. Platelet Transfusion
      1. Platelet Count <20,000/mm3
      2. Platelet Count <50,000/mm3 prior to ceserean
      3. Avoid Regional Anesthesia (spinal anesthesia) if Platelet Count <50,000/mm3
    2. Other Blood Products to consider in active bleeding
      1. Packed Red Blood Cells for severe blood loss Anemia
      2. Fresh Frozen Plasma for coagulation abnormalities
  • Complications
  1. Hepatic rupture
  2. Acute Renal Failure
  3. Pulmonary edema
  4. Ascites
  5. Pleural Effusion
  6. Abruptio Placenta
  7. Postpartum Hemorrhage
  8. Disseminated Intravascular Coagulation (DIC)
  • Prognosis
  1. Maternal mortality: 1-3%
  2. Infant and fetal mortality: 6-36%
  • References
  1. Fontaine (2000) in ALSO, B:1-36
  2. Barton (2004) Clin Perinatol 31(4): 807-33 [PubMed]
  3. Leeman (2008) Am Fam Physician 78:93-100 [PubMed]
  4. Leeman (2016) Am Fam Physician 93(2):121-7 [PubMed]
  5. Padden (1999) Am Fam Physician 60:829-39 [PubMed]