Intercurrent Infections Increase Risk for Lupus Flares

TOPLINE:

Intercurrent infections are associated with an increased risk for systemic lupus erythematosus (SLE) flares within 3 months, with major infections associated with a 7.4 times higher risk for major flares.

METHODOLOGY:

• The researchers prospectively examined the association between intercurrent infections and subsequent SLE flares in 203 patients (median age, 40 years; 91% women) with SLE from the Amsterdam SLE cohort study.
• SLE flares were defined as an increase in disease activity combined with an intensification of immunosuppressive therapy. They were categorized into minor and major flares according to the severity and required treatment.
• Major infections were defined as those requiring hospital admission or intravenous antibiotic therapy, while minor infections did not require hospital admission.
• The risk interval for the occurrence of a disease flare was defined as 3 months from the index date of an infection.
• Patients were followed for a median duration of 6 years.

TAKEAWAY:

• The incidence of major and minor infections was 5.3 (95% CI, 4.1-6.9) and 63.9 per 100 patient-years (95% CI, 59.3-69.0), respectively.
• Intercurrent infections were associated with a 1.9 times higher risk for SLE flares within 3 months (95% CI, 1.3-2.9).
• Intercurrent infections were significantly associated with minor SLE flares (hazard ratio, 1.9; 95% CI, 1.2-3.0) but not with major flares.
• Major infections were linked to a 7.4 times higher risk for major SLE flares within 3 months (95% CI, 2.2-24.6).

IN PRACTICE:

“This finding stresses the importance of awareness and strict monitoring of disease activity in patients with SLE suffering a major infection and prompt adequate treatment in case of the development of a disease flare,” the authors wrote.

SOURCE:

The study was led by Fatma el Hadiyen, Amsterdam Rheumatology and Immunology Center, Amsterdam University Medical Center in Amsterdam, the Netherlands. It was published online on July 1, 2024, in Lupus Science & Medicine.

LIMITATIONS:

The reliance on patient recall for minor infections may have introduced recall bias. The small number of patients with identified causative organisms limited the generalizability of the findings. The Bootsma criteria were used for defining SLE flares, which may not align with more recent international standards.

DISCLOSURES:

No specific funding source was reported. One author reported receiving personal fees from various pharmaceutical companies outside the submitted work.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.