Illness perceptions and fatigue in systemic vasculitis.

Area of Science:

• Rheumatology and Immunology
• Psychosomatic Medicine

Background:

• Understanding patient experiences in vasculitis is crucial for effective management.
• Illness perceptions significantly influence patient-reported outcomes, including fatigue.

Purpose of the Study:

• To compare illness perceptions across different vasculitis types.
• To identify risk factors associated with negative illness perceptions.
• To determine the relationship between illness perceptions and fatigue levels.

Main Methods:

• Utilized the revised Illness Perception Questionnaire (IPQ-R) with 692 vasculitis patients from an online registry.
• Employed cluster analysis and stepwise regression to identify predictors of negative illness perceptions.
• Assessed fatigue using the Multidimensional Fatigue Inventory (MFI-20) and analyzed its relationship with illness perceptions and disease activity via linear regression.

Main Results:

• Illness perceptions were generally consistent across nine vasculitis types, with notable differences in identity and cyclical dimensions for Behçet's disease.
• Younger age, depression, active disease status, and poor overall health were identified as risk factors for negative illness perceptions.
• Illness perception dimensions explained a significant proportion of fatigue variability, comparable to disease activity measures.

Conclusions:

• Illness perceptions in vasculitis are broadly similar across disease subtypes, with younger age being a key risk factor for negative perceptions.
• Illness perceptions provide a crucial explanatory factor for fatigue, independent of objective disease activity measures.
• Targeting illness perceptions may be a valuable strategy for managing fatigue in vasculitis patients.