Fibromyalgia subgroups: profiling distinct subgroups using the Fibromyalgia Impact Questionnaire. A preliminary...

Area of Science:

• Rheumatology and Pain Medicine
• Clinical Psychology

Background:

• Fibromyalgia (FM) is a complex chronic pain condition.
• Identifying distinct patient subgroups can improve targeted treatment strategies.
• The Fibromyalgia Impact Questionnaire (FIQ) is a common clinical assessment tool.

Purpose of the Study:

• To investigate the presence of fibromyalgia (FM) subgroups.
• To utilize the Fibromyalgia Impact Questionnaire (FIQ) for subgroup identification.
• To examine differences in experimental pain, psychosocial functioning, and demographics between identified subgroups.

Main Methods:

• Hierarchical cluster analysis was applied to selected FIQ items (pain, fatigue, morning tiredness, stiffness, anxiety, depressive symptoms).
• Sixty-one women diagnosed with FM participated.
• Group differences were assessed for experimental pain, psychosocial functioning, and demographics.

Main Results:

• Two distinct fibromyalgia subgroups were identified: FM-Type I and FM-Type II.
• FM-Type I exhibited lower levels of anxiety, depressive symptoms, and morning tiredness.
• FM-Type II presented with elevated pain, fatigue, morning tiredness, stiffness, anxiety, and depressive symptoms.
• Both subgroups demonstrated hyperalgesic responses to experimental pain.

Conclusions:

• Pain and stiffness appear to be core, universal symptoms across fibromyalgia subgroups.
• Psychological distress (anxiety, depression) is a prominent feature in only a subset of fibromyalgia patients.
• The FIQ can aid in differentiating fibromyalgia patient profiles, potentially guiding personalized treatment approaches.