Hyposplenism in systemic lupus erythematosus

Area of Science:

• Immunology
• Rheumatology
• Hematology

Background:

• Systemic lupus erythematosus (SLE) is a chronic autoimmune disease with complex pathophysiology.
• Splenic function plays a crucial role in immune regulation and clearance of aged or damaged cells.
• Hyposplenism, characterized by reduced splenic function, has been anecdotally linked to various autoimmune conditions.

Purpose of the Study:

• To investigate the prevalence of hyposplenism in patients diagnosed with systemic lupus erythematosus (SLE).
• To assess the relationship between splenic function and SLE activity.
• To determine the incidence of hyposplenism in an SLE cohort.

Main Methods:

• Evaluated splenic function in 44 SLE patients using phase contrast microscopy to quantify vacuolated red blood cells (RBCs).
• Increased percentages of vacuolated RBCs were used as an indicator of hyposplenism.
• Follow-up assessments were conducted over 2 to 4 months for patients identified with hyposplenism.

Main Results:

• Two out of 44 SLE patients (4.6%) demonstrated significantly elevated percentages of vacuolated RBCs (8.4% and 30.6%), indicative of hyposplenism.
• These patients had inactive disease, were on low-dose corticosteroids, and showed persistent vacuolated RBCs upon re-evaluation.
• The overall estimated incidence of hyposplenism in this SLE cohort was approximately 5%.

Conclusions:

• The study confirms a significant association between systemic lupus erythematosus (SLE) and hyposplenism.
• Hyposplenism appears to be present in a small but notable percentage of SLE patients, irrespective of disease activity.
• These findings highlight the importance of considering splenic function in the management and understanding of SLE.