MRS Findings (mrs + finding)

Distribution by Scientific Domains

Selected Abstracts

Correlation between 1H MRS and Memory before and after Surgery in Mesial Temporal Lobe Epilepsy with Hippocampal Sclerosis

EPILEPSIA, Issue 6 2004
Lütfü Hano
Summary: Purpose: Proton magnetic resonance spectroscopy (1H MRS), which can demonstrate neuronal loss and gliosis, may be used as a sensitive tool for lateralization of temporal lobe epilepsy (TLE). Although the correlation between the memory functions and 1H MRS has been investigated, its predictive value after surgery has not been studied previously. This study evaluated memory and 1H MRS values of medically intractable patients with mesial TLE and hippocampal sclerosis (MTLE-HS) before and after selective amygdalohippocampectomy (SAH). Methods: Twenty-two patients underwent memory tests and 1H MRS investigation before and 6 months after SAH and were compared with nine control subjects. Results: The 1H MRS scores were found to be significantly low on the pathological side of the patients. Both right-sided 1H MRS of right TLE and left-sided 1H MRS values of left TLE patients were correlated only with verbal memory scores. Statistical analysis did not reveal any significance for nonverbal memory scores for both TLE groups on either side, which showed no significant correlation between material specificity and 1H MRS findings. Conversely, regression analyses demonstrated that high right- and low left-sided 1H MRS values obtained before surgery may predict a decline in verbal learning scores after surgery. Conclusions:1H MRS can be considered as a useful tool to determine the lateralization in patients with MTLE-HS before the surgery. Although only a weak relation exists between the MRS values and memory scores, presurgical MRS scores may be predictive for a possible deterioration in verbal memory after surgery. However, further studies with higher numbers of cases are needed for confirmation of the results. [source]

MRI white matter hyperintensities, 1H-MR spectroscopy and cognitive function in geriatric depression: a comparison of early- and late-onset cases

Tetsuhito Murata
Abstract Background and Objectives Geriatric depression is often thought to differ from that at other times of adulthood. Recently, several studies have shown that the incidence of white matter hyperintense lessions identified by brain MRI is higher in patients with geriatric depression than in healthy elderly subjects, but a consensus has not yet been reached on the relationship between the severity of white matter lesions and either cognitive impairment or depressive symptoms. Method Forty-seven patients aged 50 to 75 years with major depression were divided into two groups based on age at onset of depression: early-onset (<,50 years) group (20 patients; mean age, 62.7,±,6.7) and late-onset (,50 years) group (27 patients; mean age, 65.6,±,5.4). The severity of hyperintense white matter lesions on MRI was classified by region, then a proton magnetic resonance spectroscopy (1H-MRS) focusing on the white matter of the frontal lobes, multidimensional neuropsychological tests and evaluation of depressive symptoms were conducted. Results The severity of the deep white matter lesions, the deterioration of cognitive function related to subcortical/frontal brain system and clinician-rated depressive symptoms were all more pronounced in the late-onset group compared with those in the early-onset group. It was further observed that the more severe the deep white matter lesions, the lower the levels of N-acetylaspartate/creatine. With the age of onset as the covariate, the patients with moderate deep white matter lesions had more pronounced cognitive impairment and clinician-rated depressive symptoms than those with none and/or mild lesions. Conclusion These results suggest that subcortical/frontal type cognitive impairment and the persistence of depressive symptoms in geriatric depression is related to moderate deep white matter lesions more often complicated in the late-onset group. The 1H-MRS findings were suggested to be a useful indicator of neuronal/axonal loss in the white matter of the frontal lobes which precedes cognitive impairment. Copyright © 2001 John Wiley & Sons, Ltd. [source]

MR Spectroscopy Findings in Lafora Disease

Ebru Altindag MD
ABSTRACT PURPOSE Our aim was to investigate the [1H] MR spectroscopy (MRS) findings of Lafora Disease (LD), which is a disabling form of progressive myoclonic epilepsy. METHODS Twelve patients diagnosed with LD and 12 control subjects underwent MRS studies with single-voxels of 8 cc obtained in the frontal lobe, pons, and cerebellum. The metabolites and NAA/Cr, NAA/Cho, Cho/Cr, mI/Cr ratios were calculated. Subgroup analysis was also done between 5 patients with EPM2B and 6 patients with EPM2A mutations. Two investigators scored neurological symptom severity. RESULTS We found a statistically significant difference of NAA/Cho ratio in LD patients compared with normal controls in cerebellum (P= 0.04). In addition, both myoclonus and ataxia scores showed significant correlation with NAA/Cho ratios in the pons (P= 0.03, P= 0.04) and in the cerebellum (P= 0.04, P= 0.01), respectively. CONCLUSION We conclude that the cerebellum is the mostly affected structure in LD and there are significant correlations of MRS findings with some clinical parameters. The differences in the group may be related to different genetic mutations besides disease duration and other clinical variables. MRS studies could provide insights about the severity of the involvement of LD. [source]

Brain metabolism in rett syndrome: Age, clinical, and genotype correlations,

Alena Horská PhD
Objective Brain metabolism, as studied by magnetic resonance spectroscopy (MRS), has been previously shown to be abnormal in Rett syndrome (RTT). This study reports the relation of MRS findings to age, disease severity, and genotype. Methods Forty RTT girls (1,14 years old) and 12 age-matched control subjects were examined. Single-voxel proton MRS of left frontal white matter was performed. Results NAA/Cr ratios decreased and myoinositol/Cr ratios increased with age in RTT patients (both p < 0.03), whereas these ratios were stable in control. The mean glutamate and glutamine/Cr ratio was 36% greater in RTT patients than in control (p = 0.043). The mean NAA/Cr ratio was 12.6% lower in RTT patients with seizures compared with those without seizures (p = 0.017). NAA/Cr ratios decreased with increasing clinical severity score (p = 0.031). Compared with patients with T158X, R255X, and R294X mutations, and C-terminal deletions, patients with the R168X mutation tended to have the greatest severity score (0.01 , p , 0.11) and the lowest NAA/Cr ratio (0.029 , p < 0.14). Interpretation Decreasing NAA/Cr and increasing myoinositol/Cr with age are suggestive of progressive axonal damage and astrocytosis in RTT, respectively, whereas increased glutamate and glutamine/Cr ratio may be secondary to increasing glutamate/glutamine cycling at the synaptic level. The relations between NAA/Cr, presence or absence of seizures, and disease severity suggest that MRS provides a noninvasive measure of cerebral involvement in RTT. Ann Neurol 2009;65:90,97 [source]

Brain involvement in rheumatoid arthritis: A magnetic resonance spectroscopy study

Bart J. Emmer
Objective Tumor necrosis factor , was recently implicated as an important mediator of communication between the peripheral and cerebral immune systems in an animal model of chronic inflammation. The purpose of this study was to examine by proton magnetic resonance spectroscopy (1H-MRS) the influence of inflammation on cerebral metabolism in patients with rheumatoid arthritis (RA). Methods Single-voxel 1H-MRS of the centrum semiovale was performed on 35 RA patients (6 men and 29 women; mean ± SD age 51.8 ± 14.6 years) and 28 healthy age- and sex-matched control subjects (9 men and 19 women; mean ± SD age 50.2 ± 10.4 years). None of the study subjects had any neurologic signs or symptoms. Clinical markers of disease activity were correlated with the 1H-MRS findings. Results Patients with active RA, as reflected by an elevated erythrocyte sedimentation rate (ESR), had a significantly higher ratio of choline to creatine and a significantly lower ratio of N -acetylaspartate to choline than did patients with inactive RA, as reflected by a normal ESR. Moreover, the ratios of choline to creatine and NAA to choline were significantly correlated with the ESR after correction for age, sex, smoking status, handedness, alcohol consumption, medication use, and disease duration. Medication use had no additional effect on these associations. Conclusion Our data show that systemic inflammation in RA is associated with metabolic changes in the brain. [source]