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Paroxysmal nocturnal haemoglobinuria.

S K Jha, R Kumar

    The Journal of the Association of Physicians of India
    |November 1, 1989
    PubMed
    Summary

    Paroxysmal nocturnal haemoglobinuria (PNH) is a rare blood disorder where red blood cells are destroyed. This case series presents three PNH patients, highlighting the condition

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    Area of Science:

    • Hematology
    • Complement System Biology
    • Red Blood Cell Disorders

    Background:

    • Paroxysmal nocturnal haemoglobinuria (PNH) is a rare, acquired clonal hematopoietic stem cell disorder.
    • It is characterized by complement-mediated intravascular hemolysis, a thrombosis risk, and impaired bone marrow function.
    • The underlying defect involves mutations in the PIGA gene, leading to deficiency of glycosylphosphatidylinositol (GPI)-anchored proteins on blood cells.

    Observation:

    • This report details three cases of paroxysmal nocturnal haemoglobinuria encountered over a two-year period.
    • The cases illustrate the clinical presentation and diagnostic challenges of this uncommon disorder.
    • Observations focus on the characteristic susceptibility of red blood cells to complement-mediated lysis.

    Findings:

    • The primary finding in PNH is the increased sensitivity of erythrocytes to complement-mediated lysis due to a deficiency of GPI-anchored proteins, particularly CD55 and CD59.
    • Clinical manifestations can include hemolytic anemia, venous thrombosis, and bone marrow failure.
    • Diagnosis is typically confirmed by flow cytometry detecting GPI-deficient cells.

    Implications:

    • Understanding PNH pathophysiology is crucial for timely diagnosis and effective management.
    • Early recognition of PNH can prevent severe complications such as thrombosis and organ damage.
    • Advances in complement inhibition therapies offer new treatment avenues for PNH patients.

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