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The MMPI-2 as an adjunct to the diagnosis of pseudoseizures
1Department of Psychology, University Hospital, University of Western Ontario, London, Canada.
Abstract:
Although the original Minnesota multiphasic personality inventory (MMPI) showed promise in the psychometric discrimination of patients with epileptic seizures and pseudoseizures, inconsistencies and relatively low rates of accuracy have been reported. The present study evaluated the restandardized MMPI-2 for its accuracy in discriminating patients with pseudoseizures in a population with intractable epilepsy. MMPI-2 profiles for 139 consecutive adult inpatients (24 with pseudoseizures) were classified as a pseudoseizure pattern if they had (a) a T score on Scale 1 and/or 3 > or = 65, (b) Scale 1 or 3 in the 2-point high code, and (c) if 1 or 3 was not the highest scale, it was < or = 6T from the highest scale. Compared to studies using the original MMPI, it was expected the MMPI-2 would more accurately classify patients in each group. Preliminary analyses revealed pseudoseizure patients had a greater history of mental health interventions and were older when their seizure disorder began, relative to the epilepsy patients. A classification accuracy of 92% was found for pseudoseizures and 94% for epilepsy patients. For the pseudoseizure group, clinically meaningful MMPI-2 elevations followed a 3-1-2 pattern. No mean elevations above a T value of 65 were seen in the epilepsy group.
Insights
The Minnesota Multiphasic Personality Inventory-2 (MMPI-2) accurately distinguishes patients with pseudoseizures from those with epilepsy. This revised inventory shows improved diagnostic accuracy for neurological and psychological assessment.
Area of Science:
- Neuropsychology
- Psychometrics
- Clinical Psychology
Background:
- Original Minnesota Multiphasic Personality Inventory (MMPI) showed limited accuracy in differentiating epileptic seizures from pseudoseizures.
- Need for a more reliable psychometric tool to diagnose pseudoseizures in patients with intractable epilepsy.
Purpose of the Study:
- To evaluate the diagnostic accuracy of the restandardized MMPI-2 for identifying pseudoseizures.
- To compare the MMPI-2's performance against the original MMPI in a clinical population.
Main Methods:
- Analyzed MMPI-2 profiles of 139 adult inpatients with intractable epilepsy, including 24 diagnosed with pseudoseizures.
- Defined a pseudoseizure pattern based on specific T score thresholds and scale code configurations (Scale 1, 3, and highest scale).
- Compared MMPI-2 classification accuracy with previous studies using the original MMPI.
Main Results:
- Achieved high classification accuracy: 92% for pseudoseizures and 94% for epilepsy patients.
- Pseudoseizure patients exhibited a history of mental health interventions and later onset of seizure disorder.
- A distinct 3-1-2 MMPI-2 elevation pattern was observed in the pseudoseizure group; no significant elevations in the epilepsy group.
Conclusions:
- The MMPI-2 demonstrates superior accuracy in discriminating pseudoseizures from epilepsy compared to the original MMPI.
- The identified MMPI-2 pattern (3-1-2) may serve as a valuable psychometric marker for pseudoseizures.
- MMPI-2 is a promising tool for enhancing differential diagnosis in patients with complex seizure disorders.