The levels of uric acid (UA), a natural peroxynitrite scavenger, were measured in sera from 240 patients with multiple sclerosis (MS) and 104 sex- and age-matched control patients with other neurological diseases (OND). The mean serum UA concentration was lower in the MS than in the OND group, but the difference did not reach the level of statistical significance (P = 0.068). However, the mean serum UA level from patients with active MS (202.6 + 67.1 mumol/l) was significantly lower than that in inactive MS patients (226.5 + 78.6 mumol/l; P = 0.046) and OND controls (P = 0.007). We found a significant inverse correlation of serum UA concentration with female gender (P = 0.0001), disease activity (P = 0.012) and duration (P = 0.017), and a trend towards an inverse correlation with disability as assessed by EDSS score, which did not reach statistical significance (P = 0.067). Finally, multivariate linear regression analyses showed that UA concentration was independently correlated with gender (P = 0.0001), disease activity (P = 0.014) and duration of the disease (P = 0.043) in MS patients. These findings suggest that serum UA might serve as a possible marker of disease activity in MS. They also provide support to the potential beneficial therapeutic effect of radical-scavenging substances in MS.

Summary:Purpose: In patients with multiple sclerosis (MS), epileptic seizures occur more frequently than in the general population. The aim of this study was to analyze clinical characteristics of epilepsy in patients with MS, potential correlation between the semiology of seizures, EEG and magnetic resonance imaging (MRI) findings in these patients, as well as to examine the response to anticonvulsant therapy.Methods: In a series of 268 consecutive patients with definite MS hospitalized at the Institute of Neurology, Belgrade, we identified 20 (7.5%) patients with seizures or epilepsy. All patients with seizures or epilepsy were submitted to standard EEG and brain MRI with gadopentetate dimeglumine.Results: In four patients, epilepsy occurred 1-5 years before other clinical manifestations of MS. Eight patients had seizures only during MS relapses (provoked seizures). In two of them, seizures were the only manifestations of relapse. In 12 patients, seizures occurred regardless of the phase of MS (chronic epilepsy). In the majority of patients, seizures were partial with secondary generalization. Five patients experienced episodes of status epilepticus, and they all had dementia. Abnormal EEG pattern was found in 11 patients. Brain MRI disclosed corticalsubcortical lesions in nine patients and focal cortical atrophy in one, whereas in the remaining patients, findings were inconclusive. Probable EEG-MRI-seizure type correlation existed in 10 patients.Conclusions: Our data suggest that epilepsy may represent an initial symptom of MS and a single clinical manifestation of a relapse, and further support the assumption of the existing correlation between the presence of cortical-subcortical lesions and epileptic seizures or epilepsy in patients with MS.

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Locally produced oligoclonal IgG bands (OCB) are present in the cerebrospinal fluid (CSF) of 95% patients with multiple sclerosis (MS) [2,3]. The most sensitive method for the detection of OCB is isoelectric focusing (IEF) [1]. Occasional patients with clinically definite MS lack evidence for intrathecal IgG synthesis [2,9]. This study was designed to compare brain magnetic resonance imaging (MRI) findings between CSF OCB positive and negative MS patients. The study comprised 22 OB negative patients with clinically definite MS and 22 OCB positive controls matched for age, disease duration, activity and course of MS. In the both groups clinical assessment was performed by using Expanded Disability Status Scale (EDSS) score. T2 weighted MRI of the brain was performed on a Siemens Magnetom (1.0T). Lesions were counted and sized for 15 anatomically defined locations: 7 periventricular (PV) and 8 non-periventricular (NPV) regions. An arbitrary scoring system weighted for lesions size was used to estimate total and regional lesions loads: a) 1 point was given for each lesion with a diameter 1-5 mm, b) 2 points for one lesion with a diameter 6-10 mm, c) 3 points for one over 10 mm, and confluent lesions scored one extra point [16]. Atrophy were scored as follows: 0-normal size, 1-mild atrophy, 2-moderate atrophy and 3-severe atrophy. Mean score of total brain MRI loads was lower in OCB negative than in OCB positive MS patients (44 vs. 50) but the difference was not statistically significant. Mean periventricular (32 vs. 23), non-periventricular (26 vs. 19) and infratentorial (11 vs. 9) scores were higher in OCB positive MS group in comparison with OCB negative patients, but non-significant (figure 1). There was no correlation between EDSS score and total MRI lesions load in OCB negative MS patients, while in OCB positive group we detected significant correlation between EDSS score and total MRI lesions load (p = 0.026) (figure 2). The results of this study demonstrate that by using conventional brain MRI the extent end severity of the pathological process seems to be similar in OCB negative and OCB positive MS patients. On the other hand, we found statistically significant correlation between brain MRI total lesion load and EDSS in the OCB positive MS patients, while this correlation was not detected in OCB negative MS patients. Differences in brain MRI findings between OCB positive nad OCB negative MS patients have been already analyzed [9,12]. In the first, Zeman et al. reported that OCB negative MS patients have lower total MRI brain lesion loads in comparison to OCB positive group, but the differences was not statistically significant [9]. In accordance with these findings, Fukazawa et al. also failed to show differences in the distribution, extent, shape and number of brain MRI lesions between OCB positive and negative MS patients. [12]. On the other hand, it has been demonstrated that the rate of intrathecal IgG synthesis apparently correlates with plaque volume in the brain, as demonstrated on MRI, in MS patients...

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