Hemolysis and Spherocytosis: Overview, Symptoms, and Treatment

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Hemolysis is the premature destruction of red blood cells (RBCs) before the end of their normal lifespan of approximately 120 days. As RBCs break down, hemoglobin is released and metabolized, resulting in increased bilirubin production. Hemolysis may occur within the circulation (intravascular hemolysis) or primarily in the spleen and liver (extravascular hemolysis).

Causes of Hemolysis

Hemolytic disorders are broadly classified as intrinsic (intracorpuscular) or extrinsic (extracorpuscular).

Intrinsic causes involve defects within the red blood cell itself and include:

  • Hereditary spherocytosis (HS): inherited defects of RBC membrane proteins.
  • Glucose-6-phosphate dehydrogenase (G6PD) deficiency: increased susceptibility to oxidative damage.
  • Sickle cell disease: abnormal hemoglobin (HbS) leading to sickling and premature RBC destruction.

Extrinsic causes affect otherwise normal RBCs and include:

  • Autoimmune hemolytic anemia (AIHA): autoantibodies target RBCs for destruction.
  • Infections: particularly malaria.
  • Mechanical trauma: prosthetic heart valves, microangiopathic hemolytic anemia, or other shear stress.
  • Drugs and toxins: certain medications or chemicals may trigger hemolysis.

Clinical Features

Symptoms depend on the severity and rate of hemolysis and commonly include:

  • Fatigue and weakness due to anemia.
  • Pallor.
  • Jaundice from elevated unconjugated bilirubin.
  • Dark urine caused by hemoglobin or its breakdown products.
  • Dyspnea and tachycardia resulting from reduced oxygen delivery.
  • Splenomegaly due to increased clearance of damaged RBCs.
  • Pigment (bilirubin) gallstones in chronic hemolytic disorders.

Laboratory Findings

Typical laboratory features include:

  • Anemia with an elevated reticulocyte count.
  • Increased lactate dehydrogenase (LDH).
  • Elevated unconjugated (indirect) bilirubin.
  • Decreased haptoglobin (particularly in intravascular hemolysis).
  • Characteristic abnormalities on the peripheral blood smear.
  • A positive direct antiglobulin (Coombs) test in autoimmune hemolytic anemia.

Treatment

Management depends on the underlying cause.

Examples include:

  • AIHA: corticosteroids are first-line therapy, with immunosuppressive agents, intravenous immunoglobulin (IVIG), rituximab, or splenectomy reserved for refractory cases.
  • G6PD deficiency: avoidance of oxidative drugs and foods (e.g., fava beans).
  • Sickle cell disease: hydroxyurea, pain management, and transfusion therapy when indicated.
  • Infections: treatment of the underlying infection.
  • Mechanical hemolysis: correction or replacement of the offending device if possible.

Supportive measures may include blood transfusions, folic acid supplementation, and management of complications such as gallstones or transfusion-related iron overload.

Hereditary Spherocytosis

Hereditary spherocytosis (HS) is the most common inherited disorder of the red blood cell membrane. The characteristic feature is the presence of spherocytes—red blood cells that are spherical rather than their normal biconcave disc shape. Because these cells are less deformable, they become trapped and destroyed in the spleen, resulting in chronic extravascular hemolysis.

Pathophysiology

The RBC membrane is stabilized by a cytoskeletal network composed of proteins including spectrin, ankyrin, band 3, and protein 4.2. Mutations affecting these proteins weaken the membrane, causing gradual membrane loss during circulation. As surface area decreases while cell volume remains relatively constant, RBCs assume a spherical shape.

This process leads to:

  • membrane instability,
  • progressive membrane loss,
  • reduced surface-area-to-volume ratio,
  • formation of rigid spherocytes,
  • premature splenic sequestration and destruction.

Genetic Causes

Hereditary spherocytosis is caused by mutations in genes encoding RBC membrane proteins, including:

  • ANK1 (ankyrin)
  • SPTB (β-spectrin)
  • SPTA1 (α-spectrin)
  • SLC4A1 (band 3)
  • EPB42 (protein 4.2)

Approximately 75% of cases follow an autosomal dominant inheritance pattern.

Acquired Spherocytosis

Spherocytes may also develop in autoimmune hemolytic anemia. In this setting, antibodies bind to RBCs, and splenic macrophages remove portions of the cell membrane. The resulting membrane loss produces spherocytes despite the absence of an inherited membrane defect.

Diagnosis

Characteristic findings include:

  • Spherocytes on the peripheral blood smear.
  • Elevated mean corpuscular hemoglobin concentration (MCHC).
  • Increased red cell distribution width (RDW).
  • Reticulocytosis.
  • Elevated indirect bilirubin.
  • Reduced haptoglobin when active hemolysis is present.

The preferred confirmatory test is the eosin-5′-maleimide (EMA) binding test. The osmotic fragility test remains useful but is less sensitive and less specific.

Relationship to Autoimmune Disease

Although hereditary spherocytosis is a genetic disorder, acquired spherocytosis may occur in autoimmune hemolytic anemia. Because autoimmune hemolytic anemia is associated with several autoimmune diseases—including, in some cases, celiac disease—patients with these disorders can occasionally develop spherocytes secondary to immune-mediated membrane loss rather than inherited membrane defects.

References:

Autoimmune Hemolytic Anemia
https://www.merckmanuals.com/professional/hematology-and-oncology/anemias-caused-by-hemolysis/autoimmune-hemolytic-anemia

Hereditary Spherocytosis
https://www.ncbi.nlm.nih.gov/books/NBK539797/

Hereditary Spherocytosis (Spherocytic Anemia)
https://www.onkopedia.com/en/onkopedia/guidelines/hereditary-spherocytosis-spherocytic-anemia/@@guideline/html/index.html

Diagnostic power of laboratory tests for hereditary spherocytosis: a comparison study in 150 patients grouped according to molecular and clinical characteristics
https://haematologica.org/article/view/6264

Hemolytic Anemia(Archived)
https://www.ncbi.nlm.nih.gov/books/NBK558904/

Hereditary spherocytosis
https://www.ncbi.nlm.nih.gov/books/NBK558904/

Autoimmune Hemolytic Anemia
https://www.msdmanuals.com/home/blood-disorders/anemia/autoimmune-hemolytic-anemia

 © 2000-2030 Sieglinde W. Alexander. All writings by Sieglinde W. Alexander have a fifty-year copyright. Library of Congress Card Number: LCN 00-192742 ISBN: 0-9703195-0-9

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