Callosal atrophy in multiple sclerosis is related to cognitive speed.

BACKGROUND: Long-term changes regarding corpus callosum area (CCA) and information processing speed in cognitive and sensory-motor tasks have rarely been studied in multiple sclerosis (MS). OBJECTIVE AND METHODS: Information processing speed in cognitive (Symbol Digit Modalities Test, SDMT), sensory (visual and auditory reaction time) and motor (finger-tapping speed, FT; right and left hand) tasks as well as auditory inter-hemispheric transfer (verbal dichotic listening, VDL) was related to CCA, measured by MRI at baseline and at follow-up after nine years in 22 patients with MS. Possible confounding by demographic (age, gender and education), clinical (symptom onset, duration, severity of disease) and relative brain volume (RBV) as well as T2 lesion load was taken into account. RESULTS: The smaller the CCA at baseline, the slower was SDMT performance at baseline. In a similar way, CCA at follow-up was associated with poor SDMT result at follow-up. Furthermore, the higher the annual rate of change in CCA, the poorer was performance in VDL on the left ear and the more pronounced was the right ear advantage. A positive relationship between performance in VDL right ear and annual rate of change in RBV was also seen. Sensory-motor tests were not significantly associated with CCA. T2 lesion load at baseline was associated with FT performance at baseline. Demographic, clinical and radiological (RBV and T2 lesion load) characteristics did not confound the significant relation between CCA and SDMT. CONCLUSIONS: CCA unlike RBV and T2 lesion load was associated with SDMT, which indicated a marked cognitive rather than perceptual-motor component.

Selective decline in information processing in subgroups of multiple sclerosis: an 8-year longitudinal study.

Multiple sclerosis (MS) is an inflammatory and degenerative disease of the central nervous system (CNS) that causes white matter and cortical lesions over many years. The CNS is selectively affected by the disease with a great variety of symptoms between patients. In this study, we describe the impact on various aspects of cognition over an 8-year follow-up period in 31 consecutive MS patients subgrouped as relapsing remitting (RR) MS, secondary progressive (SP) MS, and primary progressive (PP) MS. Results showed a differential pattern of cognitive decline already at baseline in speed of information processing. During the follow-up, a pronounced decline occurred in speed of information processing, finger-motor speed, copying geometrical designs, episodic memory, and visuospatial short-term memory. A striking difference was observed between a marked decline in visual reaction time, whereas no significant change was seen in auditory reaction time. In contrast, there was no time-related decline in verbal abilities. However, an initial marked cognitive impairment predicted further cognitive decline over the 8-year follow-up. Information-processing tests were found to be an especially strong predictor of long-term cognitive decline. In addition, high EDSS score at follow-up was associated with decline in information processes. Results also showed that SP-MS patients deteriorated significantly more than the other two groups, particularly in visual compared to auditory information processing. To conclude, cognitive decline appeared particularly in SP-MS patients and in visual information processing.

Retention of Gadolinium-Based Contrast Agents in Multiple Sclerosis: Retrospective Analysis of an 18-Year Longitudinal Study.

BACKGROUND AND PURPOSE: Gadolinium-based contrast agents have been associated with lasting high T1-weighted signal intensity in the dentate nucleus and globus pallidus, with histopathologically confirmed gadolinium retention. We aimed to longitudinally investigate the relationship of multiple gadolinium-based contrast agent administrations to the Signal Intensity Index in the dentate nucleus and globus pallidus and any associations with cognitive function in multiple sclerosis. MATERIALS AND METHODS: The Signal Intensity Index in the dentate nucleus and globus pallidus was retrospectively evaluated on T1-weighted MR imaging in an 18-year longitudinal cohort study of 23 patients with MS receiving multiple gadolinium-based contrast agent administrations and 23 healthy age- and sex-matched controls. Participants also underwent comprehensive neuropsychological testing. RESULTS: Patients with MS had a higher Signal Intensity Index in the dentate nucleus (P < .001), but not in the globus pallidus (P = .19), compared with non-gadolinium-based contrast agent-exposed healthy controls by an unpaired t test. Increasing numbers of gadolinium-based contrast agent administrations were associated with an increased Signal Intensity Index in the dentate nucleus (ß = 0.45, P < .001) and globus pallidus (ß = 0.60, P < .001). This association remained stable with corrections for the age, disease duration, and physical disability for both the dentate nucleus (ß = 0.43, P = .001) and globus pallidus (ß = 0.58, P < .001). An increased Signal Intensity Index in the dentate nucleus among patients with MS was associated with lower verbal fluency scores, which remained significant after correction for several aspects of disease severity (ß = -0.40 P = .013). CONCLUSIONS: Our data corroborate previous reports of lasting gadolinium retention in brain tissues. An increased Signal Intensity Index in the dentate nucleus and globus pallidus was associated with lower verbal fluency, which does not prove causality but encourages further studies on cognition and gadolinium-based contrast agent administration.

[Cognitive and affective dysfunction in MS]. / Kognitiv och affektiv dysfunktion vid MS.

Prevalence studies have shown cognitive and affective disorders to be common in multiple sclerosis (MS). Although much is known about the manifestations of such disorders, our knowledge of the cerebral systems involved remains poor. Functional techniques will enable cerebral blood flow to be measured, and sophisticated SPECT (single photon emission computed tomography) techniques can provide a clearer picture of the dynamics of cognitive and affective processes in MS. Increased knowledge of these disorders would enable the management and rehabilitation of MS patients to be improved.

Multiple sclerosis in Stockholm County. A pilot study exploring the feasibility of assessment of impairment, disability and handicap by home visits.

OBJECTIVE: A pilot study performed within Stockholm County to evaluate the feasibility of collecting data using a comprehensive evaluation package administered in the home environment to assess impairment, disability and handicap in order to explore the consequences of multiple sclerosis (MS). DESIGN: Home visits to 26 purposefully selected MS patients with different levels of disability, in both ordinary and sheltered living. The comprehensive evaluation package included: biographical data, Mini-Mental State Examination, Free Recall and Recognition of 12 Random Words Test, Symbol Digit Modalities Test, Beck Depression Index, Lindmark Motor Capacity Assessment, time to walk 10 metres, Nine-hole Peg Test, Barthel ADL Index, Katz Extended ADL Index, Frenchay Activities Index, Sickness Impact Profile and frequency of falls and injurious falls. RESULTS: This pilot study demonstrates that the proposed methods can be used to evaluate MS patients differing in levels of disability and forms of living. The data collection method, based on home visits, was well accepted by the patients, their spouses and salaried personal assistants and could be performed within 2-2 1/2 hours. CONCLUSIONS: The evaluation package used in this pilot study is suitable for use in population-based studies and it should provide comprehensive information on the impact and consequences of MS on patients, and should contribute to the identification of areas in which the provision of rehabilitation and health care services needs to be improved.