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Is the MMPI invalid for assessing psychological disturbance in pain related organic conditions?
1Department of Psychology and Social Sciences, Rush Medical College, Chicago, IL 60612.
Abstract:
The Minnesota Multiphasic Personality Inventory (MMPI) was analyzed in 30 patients with fibromyalgia and 30 patients with rheumatoid arthritis (RA). Eighteen statements on the hypochondriasis, depression and hysteria scales and 14 statements on the schizophrenia scale differentiated patients with fibromyalgia and RA. Patients with fibromyalgia had higher scores on 29 of the 32 statements. Patients with RA seemed appropriately concerned about health and the possibility of additional illness. By contrast, patients with fibromyalgia were more symptomatic and presented a more unusual and complex syndrome, raising the possibility of a somatoform disorder and also greater personal distress in these patients. On the basis of analyzing the scores of patients with RA, one can also conclude that physical illness alone is not sufficient to drive MMPI profiles into the abnormal range. Patients with fibromyalgia who have a similar degree of pain intensity compared with patients with RA (61.3 vs 60 on a scale of 100) have significantly more abnormal MMPI, and analysis of their MMPI suggest a more complex somatic syndrome and greater psychological disturbance.
Insights
Fibromyalgia patients exhibit more psychological distress and complex symptoms than rheumatoid arthritis patients, even with similar pain levels. Analysis of the Minnesota Multiphasic Personality Inventory (MMPI) reveals significant differences in patient profiles.
Area of Science:
- Psychological Medicine
- Rheumatology
- Psychosomatic Medicine
Background:
- Fibromyalgia and rheumatoid arthritis (RA) are chronic conditions often involving pain.
- Understanding the psychological profiles associated with these conditions is crucial for comprehensive patient care.
- The Minnesota Multiphasic Personality Inventory (MMPI) is a tool used to assess psychological disturbances.
Purpose of the Study:
- To compare the psychological profiles of patients with fibromyalgia and rheumatoid arthritis using the MMPI.
- To identify specific MMPI scales and statements that differentiate between these two patient groups.
- To explore the nature and extent of psychological distress in fibromyalgia compared to RA.
Main Methods:
- The study involved 30 patients diagnosed with fibromyalgia and 30 patients with rheumatoid arthritis.
- The Minnesota Multiphasic Personality Inventory (MMPI) was administered to all participants.
- Statistical analysis focused on differentiating MMPI scales and specific statements between the two groups.
Main Results:
- Eighteen statements from hypochondriasis, depression, and hysteria scales, and 14 from the schizophrenia scale differentiated the groups.
- Patients with fibromyalgia scored higher on 29 out of 32 analyzed MMPI statements compared to RA patients.
- Despite similar pain intensity, fibromyalgia patients showed significantly more abnormal MMPI profiles, indicating greater psychological disturbance and a more complex somatic syndrome.
Conclusions:
- Fibromyalgia is associated with a more complex somatic syndrome and greater psychological distress than rheumatoid arthritis.
- Physical illness alone does not necessarily lead to abnormal MMPI profiles, as seen in RA patients.
- The findings suggest a potential somatoform disorder component in fibromyalgia, warranting further investigation and tailored treatment approaches.