Implication of invalidation concept in fibromyalgia diagnosis

Objectives The invalidation or social pain is an important but neglected issue in polysymptomatology of fibromyalgia (FM). This study sought whether tracing-perceived invalidation could be effective to discriminate between the presence and absence of FM in chronic pain patients with respect to five different sources, including spouses, family, colleagues, health professionals, and social services. Methods A total of 207 consecutive chronic pain patients were evaluated for the presence of FM by rheumatologic assessment. Invalidation was measured by the Illness Invalidation Inventory (3*I). Receiver operator characteristic (ROC) analyses were used to evaluate the ability of 3*I dimensions and sources to discriminate having FM among chronic pain patients. Binary logistic regression analyses were performed. Results The perceived discounting and lack of understanding from spouse and family sources were higher in FM rather than non-FM patients. ROC analyses demonstrated that invalidation dimensions stemming from spouse and family could appropriately discriminate between the presence and absence of FM. The area under the curve (AUC) for other sources showed non-significant values. Adjusted logistic regression analysis by age, education level, and work status showed that discounting by family and lack of understanding by the spouse could be significant predictors of FM (OR 2.30; 95% CI 1.29-4.11, P = 0.005; OR 1.72; 95% CI 1.08-2.74, P = 0.022, respectively). Conclusions This study elucidated the discriminatory power of invalidation in identification of FM from non-FM patients, especially when originated from spouse and family. Our results provide a basis to propose the invalidation as a salient component in the FM dictionary parallel to other famous FM symptoms.