Mei-Ping Ding

Zhejiang University, Hangzhou, Zhejiang Sheng, China

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Publications (43)38.5 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Fructose-1,6-diphosphate (FDP) shifts the metabolism of glucose from glycolysis to the pentose phosphate pathway and has anticonvulsant activity in several acute seizure animal models. In the present study, we investigated the anti-epileptogenic effects of FDP in an amygdaloid-kindling seizure model, which is an animal model of the most common form of human temporal lobe epilepsy. We found that 1.0g/kg FDP slowed seizure progression and shortened the corresponding after-discharge duration (ADD). FDP increased the number of stimulations needed to reach seizure stages 2-5 and prolonged the cumulative ADD prior to reaching stages 3-5. It also shortened staying days and cumulative ADD in stages 4-5. However, it demonstrated no significant protective effect when administered after the animals were fully kindled. In hippocampal neurons, cation-chloride co-transporters (CCCs) are suggested to play interesting roles in epilepsy by modulating γ-aminobutyric acid (GABA)ergic activity through controlling GABAA receptor-mediated reversal potential. We examined the potential link between FDP and the hippocampal expression of two main members of the CCCs: the neuron-specific K+-Cl- co-transporter 2 (KCC2) and Na+-K+-Cl- co-transporter 1 (NKCC1). FDP inhibited the kindling-induced downregulation of KCC2 expression and decreased NKCC1 expression during the kindling session. Taken together, our data reveal that FDP may have protective activity against epileptogenesis, from partial to generalized tonic-clonic seizures. Furthermore, our findings suggest that the FDP-induced imbalance between KCC2 and NKCC1 expression may be involved in the neuroprotective effect.
    Brain research 10/2013; · 2.46 Impact Factor
  • Zhong-Jin Wang, Shuang Wang, Mei-Ping Ding
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    ABSTRACT: To investigate the protective effects of carnosine against experimental closed head injury (CHI) in mice. The CHI model was established by free-falling weight-drop. Carnosine (250 mg/kg or 500 mg/kg) was administered intraperitoneally 30 min before brain trauma, then q.d for 7 d; while normal saline was administrated for control group. The neurological defect was evaluated by neurological severity score (NSS) within 7 d; the survival rate and the histological alternations were observed. Carnosine prevented the body weight loss of mice at dose of 500 mg/kg; significantly increased the survival rate, and reduced the neurological defect and histological damage at dose of 250 and 500 mg/kg. Carnosine can attenuate closed head injury in mice.
    Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 05/2013; 42(3):297-302.
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    ABSTRACT: Objective: To compare the safety of intravenous thrombolytic therapy with recombinant tissue plasminogen activator (rtPA) in ischemic patients under the guidance of CT and multi-mode MRI. Methods: The clinical, laboratory, and radiologic data from 113 consecutive hyperacute ischemic patients who received intravenous rtPA therapy from June 2009 to October 2011 was retrospectively reviewed. The rate of hemorrhagic transformation (HT) and the clinical outcome between CT and multi-mode MRI was compared. Etiological subgroups were classified according to Chinese ischemic stroke subclassification (CISS). Results: Among 113 patients treated with intravenous rtPA, the mean age was 66 ±12 years, 74(65.5%) were man, the pretreatment National Institutes of Health Stroke Scale score (NIHSS) was 12.4 ±6.5, and time from symptom onset to therapy was 259.7 ±131.7 min. Postlytic radiological HT was found in 34 patients (30.1%). Symptomatic ICH occurred in 9 patients (8%). Logistic regression analysis suggested that multi-mode MRI was an independent predictor of reduced risk of HT. Conclusion: The risk of hemorrhagic complications is lower in patients receiving intravenous thrombolytic therapy with rtPA guided by multi-mode MRI than those guided by CT scan.
    Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 11/2012; 41(6):665-71.
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    ABSTRACT: Ketogenic diets (KD) have shown beneficial effects in terms of anticonvulsant and anti-epileptogenic properties in several experimental models. However, few studies have investigated the consequences of KD with regards to the anti-epileptogenic and neuroprotective effects in kindling-induced seizures. Here, postnatal day 28 male Sprague-Dawley rats received one of two experimental diets for 4 weeks: (a) a 'classic' 4:1 KD; and (b) a normal regular rodent chow diet (ND). Fully-kindled seizures were achieved by daily electrical stimulation in the amygdala. Seizure stage and after-discharge duration (ADD) were assessed daily. The after-discharge threshold (ADT) was measured every 5 days. The effects of the two diets on neuronal loss were observed before kindling and 20 days after stimulation by Nissl staining. We found that the progression of seizure stage and ADD was delayed by KD. KD prevented the ADT decrease on day 5. The incidence of generalized seizures was lower in the KD group compared to the ND group. The neuronal density was decreased in the ipsilateral hilus of the dentate gyrus (DG) and CA1 area, as well as the contralateral CA1 area before kindling in the KD group. However, KD prevented neuronal loss in the ipsilateral CA1 area 20 days after stimulation. Our data suggest that KD can protect against epileptogenesis by preventing both after-discharge generation and propagation in kindling seizures. In addition, KD also possesses a neuroprotective function during kindling although it changes hippocampal development in early life.
    Neuroscience Letters 12/2011; 508(1):22-6. · 2.03 Impact Factor
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    ABSTRACT: Radiation-induced necrosis is commonly seen after radiotherapy for nasopharyngeal carcinoma (NPC), but a post-irradiation brain abscess is rarely encountered and easily overlooked, which may lead to a dismal outcome. We describe two Chinese men with cerebral herniation caused by temporal lobe abscess within a radio-necrotic lesion presenting only with headache and neurological defects. Cranial magnetic resonance imaging (MRI) or computed tomography (CT) showed cystic lesions in the temporal lobe with a severe mass effect. Both patients had brain herniation before emergency operations. Therefore, our findings suggest that a post-irradiation brain abscess may insidiously develop into disastrous herniation, and regular multi-modality neuroimaging follow-up should be carried out to help avoid this situation.
    Am. J. Biomed. Sci. 01/2011; 3:183-190.
  • Chao-hui Jing, Min Lou, Ji-hua Wang, Mei-ping Ding
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    ABSTRACT: To investigate the influence of location and size of acute insular infarct on stroke-related electrocardiogram (ECG) changes and cardiovascular events. Ninety-nine cases admitted to hospital from October 2007 to June 2009, who were diagnosed as acute middle cerebral artery territory infarct within 48 h after onset and without the history of cardiac diseases, were included in the study. The patients were further divided into three groups: major insular infarct, minor insular infarct and control group, according to the infarct size on MRI diffusion-weighted image. The clinical data, ECG changes and cardiovascular events were compared between left and right insular infarct. Logistic regression was applied to determine the independent risk factors of ECG changes and cardiovascular events. Large artery atherosclerosis was the main cause of acute insular infarct (71.8 %), which was associated with higher NIHSS score compared to the control group (P < 0.01). Comparing the left and right insular infarct, the frequencies of sinus bradycardia and sudden cardiac death were significantly higher in left insular infarct (P < 0.01 and P < 0.05), while there was a trend that the frequency of atrial fibrillation was higher in right insular infarct (P = 0.079). With the larger size of insular infarct, the frequency of sinus bradycardia, new atrial fibrillation and sudden cardiac death (P<0.01, P<0.05 and P<0.05, respectively) became much higher. Logistic regression analysis showed that major insular infarct was related to the higher frequency of sinus bradycardia (OR = 4.660, 95% CI: 1.646 ~ 13.195; P = 0.004). Acute insular infarct is associated with the stroke-related ECG changes and sudden cardiac death. Left insular infarct is related to sinus bradycardia, possibly due to the enhanced parasympathetic tone. It deserves clinical attention that the incidence of cardiac autonomic disturbance becomes higher with the enlarged insular infarct size.
    Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 11/2010; 39(6):577-82.
  • Jia-jun Zhou, Mei-ping Ding, Jian-ren Liu
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    ABSTRACT: Hydrocephalus is a common medical condition characterized by abnormalities in the secretion,circulation or resorption of cerebrospinal fluid (CSF), resulting in ventricular dilatation. The pathogenetic mechanism for the hydrocephalus is attributed to: the overproduction of CSF by the choroid plexus; the defect in CSF absorption and obstruction of CSF flow in the cerebral ventricles. However, the underlying etiology is poorly understood. With the development of genetic engineering, a growing body of evidence indicates that genetic factors play an essential role in the pathogenesis of hydrocephalus. It is the aim of this review to summarize these findings.
    Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 11/2010; 39(6):644-9.
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    ABSTRACT: Deep brain stimulation (DBS) is now emerging as a new option for treating intractable epilepsy. Cumulative studies suggest that the mediodorsal thalamic nucleus (MD) is involved in limbic seizure activity. This study aims to investigate whether DBS of the MD can protect against seizures induced by amygdaloid kindling. We studied the effect of low-frequency stimulation (LFS, 1 Hz) or high-frequency stimulation (HFS, 100 Hz) in the MD on amygdaloid kindling seizures. During the kindling acquisition, DBS in the MD was daily administered immediately after the kindling stimulus or before the kindling stimulus (preemptive DBS). The effects of both post-treatment of DBS and preemptive DBS in the MD on the expression of amygdaloid kindling seizures were evaluated. We found the DBS or preemptive DBS in the MD, either LFS or HFS, did not significantly change the rate of amygdaloid kindling. Similarly, DBS or preemptive DBS in the MD did not significantly change any parameters representing the expression of amygdaloid kindling. Our study suggests that DBS in the MD may have no significant effect on limbic seizures.
    Neuroscience Letters 09/2010; 481(2):97-101. · 2.03 Impact Factor
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    ABSTRACT: The 39-item Parkinson's Disease Questionnaire (PDQ-39) has been tested in many languages, but not in Chinese mainland. We aimed to assess the Chinese (mainland) version of the PDQ-39. Seventy-one subjects with Parkinson's disease (PD) completed the PDQ-39 and the Medical Outcomes Study 36-item Short Form Health Survey (SF-36). All subjects were retested with the PDQ-39 a week later. The united Parkinson's disease rating scale (UPDRS) and the Hoehn and Yahr (H & Y) scale were also used to evaluate the subjects. Reliability was assessed by Cronbach's alpha and intra-class correlation coefficient (ICC). Validity was examined in terms of agreement with SF-36, UPDRS, and H & Y scales. The Chinese (mainland) version of the PDQ-39 demonstrated acceptable reliability (Cronbach's alpha: 0.84-0.88; ICC: 0.56-0.82). The item-total correlations (0.33-0.88) and scaling success rates (77.56%) indicated satisfactory convergent and discriminant validity of the PDQ-39 items. The correlations between related constructs of the PDQ-39 and UPDRS (r=0.44-0.68) and between those of the PDQ-39 and SF-36 (r=(-0.46)-(-0.69)) were all statistically significant (P<0.01). Except for stigma, cognitions, and bodily discomfort, all other dimensions of the PDQ-39 significantly discriminated patients at different H & Y stages indicated by the H & Y scale. Although our observations indicate that some problematic subscales of this version of the PDQ-39 could be improved upon, this study suggests acceptable reliability and validity of the Chinese (mainland) version of the PDQ-39.
    Journal of Zhejiang University SCIENCE B 07/2010; 11(7):531-8. · 1.11 Impact Factor
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    ABSTRACT: Inhibition of glycolytic metabolism may provide a new therapy for refractory epilepsy. Fructose-1,6-diphosphate (FDP), which inhibits glycolysis and diverts glucose into the pentose phosphate pathway, has strong inhibitory action on seizures induced by chemical convulsants. Here, we investigated the effect of FDP on a rat model of rapid hippocampal kindling. After determining the after-discharge threshold (ADT), the seizure severity and after-discharge duration (ADD) were measured to study the antiepileptogenic effects of FDP (0.5 or 1.0 g/kg i.p. for 4 days). The mRNA expression levels of the brain-derived neurotrophic factor (BDNF) and its principal receptor TrkB, which are key modulators of seizure activity, were determined in the ipsilateral hippocampus by real-time polymerase chain reaction (RT-PCR). High-dose FDP (1.0 g/kg) delayed kindling development together with shortened ADD, and high-dose treated rats also needed more kindling stimulations and more cumulative ADD to stage 4. However, it showed no significant antiepileptogenic effect at a lower dose of 0.5 g/kg. In addition, FDP attenuated BDNF and TrkB expression before and during kindling procedure; this result indicated that BDNF/TrkB signaling pathway may participate in the antiepileptogenic action of FDP. Our data demonstrates that FDP has a significant antiepileptogenic effect in kindling seizures and that it may be a potential antiepileptic drug in the future.
    Neuroscience Letters 04/2010; 477(1):33-6. · 2.03 Impact Factor
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    ABSTRACT: This study describes the clinical and neuroimaging features of five patients with 1, 2-Dichloroethane (DCE) toxic encephalopathy. From January 1st 1998 to June 30th 2009, five patients who were subsequently diagnosed with DCE toxic encephalopathy were admitted to our hospital. All were female workers who had been in contact with DCE and subsequently had had seizures or symptoms of intracranial hypertension, including headache, nausea, and vomiting. The cranial MRI showed extensive brain edema in either the subcortical white matter, bilateral globus pallidus, and cerebellar nucleus dendatus, or the cortices. Of the five patients in the study, three had vasogenic edema, one had cytotoxic edema, and one had both types of edema. Following treatment with steroids and mannitol for 3 to 10 weeks, all patients made either a partial or complete recovery. The imaging findings were resolved on a follow-up MRI. It is clear that occupational exposure to DCE can cause severe toxic encephalopathy. Moreover, extensive brain edema, secondary to blood-brain barrier damage or neuronal injury, is the major neuroimaging feature and the cause of clinical manifestations. Early diagnosis and prompt treatment leads to a good outcome.
    Journal of the neurological sciences 02/2010; 292(1-2):111-3. · 2.32 Impact Factor
  • Yin Hu, Yi Guo, Yi-Qi Wang, Qiang Du, Mei-Ping Ding
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    ABSTRACT: To develop and validate a Chinese version of the Patient-Weighted Quality of Life in Epilepsy Questionnaire (QOLIE-31-P). The original English version of the QOLIE-31-P was translated into the Chinese language. The inventory was then completed by 200 adult patients with epilepsy; and 49 patients also completed the scale twice within three weeks. Test retest, internal consistency reliabilities, construct validity, and some influential factors for quality of life in adults with epilepsy were assessed. Test retest reliability (Pearson's correlation coefficient) for the Chinese version of the QOLIE-31-P ranged from 0.725 to 0.912 (P<0.001), and the internal consistency reliability (Cronbach's alpha coefficient) ranged from 0.627 to 0.898. Factor analysis showed that there were seven factors, which explained the total variance for 64.9%. The coefficient of seizure frequency with the quality of life was -0.81(P<0.05). The QOLIE-31-P score of the patients with tonic clonic seizure was 55.7 +/-16.6, and that of other seizure type was 61.4 +/-18.7(t=-2.568, P<0.05). The psychometric properties of the Chinese version of the QOLIE-31-P have satisfactory reliability and validity, and can be applied to assess quality of life in Chinese adult patients with epilepsy.
    Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 11/2009; 38(6):605-10.
  • Hui-Qin Liu, Jian-Ren Liu, Mei-Ping Ding
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    ABSTRACT: Mouse stroke models provide experiment basis for study of the mechanisms of cell death and neural repair, and the neuroprotective effect of new drugs. There are at least three models of middle cerebral artery occlusion (MCAO) routinely used in experimental study. These models vary widely in their application in study of cell death or neural repair, and simulation of human diseases. This review article is focused on the characteristics of three mouse MCAO models and the strains-related differences in susceptibility to cerebral ischemia.
    Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 09/2009; 38(5):541-6.
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    ABSTRACT: The mechanism underlying the antiepileptic function of deep brain stimulation (DBS) of the anterior thalamic nucleus (ATN) remains unknown, presumably related to functional lesioning of target. We measured the regional normalized cerebral metabolic rate of glucose (nCMRglc) with (18)F-fluorodeoxyglucose (FDG)-MicroPET in animals receiving either ATN stimulation or lesioning. Bilateral ATN stimulation reversibly increased glucose uptake in the target region, the thalamus and hippocampus, and decreased glucose uptake in the cingulate cortex and frontal cortex. However, bilateral ATN lesioning decreased glucose uptake only in the target region. Animals with bilateral ATN lesions showed no metabolic changes after ATN stimulation. Thus, bilateral DBS of the ATN reversibly induces metabolic activation of the target area and modulates energy metabolism in remote brain regions via efferent or afferent fibers in non-epileptic rats. DBS of the ATN may work by a different mechanism than ATN lesioning.
    Neurobiology of Disease 04/2009; 34(3):477-83. · 5.62 Impact Factor
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    ABSTRACT: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is an inherited cerebrovascular disease caused by a mutation of the NOTCH3 gene. The clinical information of two CADASIL families was studied and mutation analysis of the NOTCH3 gene was performed by DNA direct sequencing. Published studies of Mainland Chinese CADASIL patients were reviewed and reanalyzed. The patients in the two families showed migraine with aura, stroke and cognitive decline. Cranial MRI revealed subcortical white matter infarcts and leukoencephalopathy. Two previously reported mutations of the NOTCH3 gene, c.397C>T and c.268C>T, were identified and cosegregated with the disease. The main clinical features, cranial MRI and pathological changes in Mainland Chinese CADASIL patients were similar to those in other regions. The frequency of migraine may be lower than that in Europe, but similar to that in Asia. Eight different NOTCH3 gene mutations were reported among Mainland Chinese CADASIL patients; of these, the c.322C>T mutation has not been reported in other regions. This study supports that the clinical features of Mainland Chinese CADASIL patients are similar to those seen in other regions and that exon 3 and exon 4 of the NOTCH3 gene are the mutation hotspots in Mainland Chinese CADASIL patients.
    Journal of the neurological sciences 01/2009; 279(1-2):88-92. · 2.32 Impact Factor
  • Hai-tao Hu, Fei Fen, Mei-ping Ding
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    ABSTRACT: To investigate the effects of puerarin with aspirin on the markers of damaged vascular endothelial cells, as von Willebrand factor (vWF), and thrombomodulin (TM) in patients with acute cerebral infarction (ACI). Forty-five patients with ACI were included in this study and divided into basic treatment and puerarin groups, meanwhile 26 healthy persons selected as control group. The serum vWF and sTM concentrations were measured by enzyme-linked immunosorbant assay (ELISA) and national institute health stroke scale (NIHSS) score was evaluated at admission and 14 days later after treatment. The level of serum vWF significantly increased in patients with ACI compared to control and major stroke had higher vWF level than minor stroke (P < 0.01), but the serum level of sTM had no obviously differences respectively. Correlation analysis showed that there is a positive correlation between the level of vWF and NIHSS score (P < 0.05, r = 0.368), while the significant correlations between the level of vWF and sTM, sTM and NIHSS score were not observed. After 14 days treatment, the level of serum vWF and NIHSS score were obviously decreased in patients treated with puerarin and aspirin, not in basic treated patients. The level of sTM was increased in patients after 14 d, while puerarin treated patient has lower sTM level than patients with basic treatment (P < 0.05). Patients with ACI cotreated with puerarin and aspirin improved the neurological function, decreased the levels of serum vWF and sTM, indicating puerarin with aspirin had the protective effects on the damaged vascular endothelial cells.
    Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica 12/2008; 33(23):2827-9.
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    ABSTRACT: Delayed post-anoxic encephalopathy has rarely been reported, and has most commonly been associated with carbon monoxide poisoning. The underlying pathophysiological mechanism is unknown. We describe a patient with a delayed neurologic decline after a good initial recovery from a hypoxic-ischemic event precipitated by acute blood loss. MRI revealed early globus pallidus necrosis followed by delayed substantia nigra damage and leukoencephalopathy. We suggest that anemia might play a role in this pattern of hypoxic-ischemic brain injury.
    Journal of the Neurological Sciences 11/2008; 277(1-2):147-9. · 2.24 Impact Factor
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    ABSTRACT: To investigate the clinical manifestations and to make genetic analysis in a pedigree with myotonic dystrophy disease. The proband and available family members were identified by neurological examination. The clinical manifestation of 8 patients (including the proband) was analyzed; the electromyographic data of 5 patients were compared with 6 other family members. Blood samples were obtained from the 7 patients of the family (excepting II6). DM(1) and DM(2) gene were amplified by PCR, tested by agarose electrophoresis, then analyzed by genetic analyzer. Myotonia and muscle weakness were the main manifestations associated with heart block (7/8) and cataract(6/7). Electromyologram showed myopathic abnormalities not only in patients but also in other members of the family (5/6). The CTG repeats in DM1 and CCTG repeats in DM2 were all in normal range. There likely to be new mutants in this DM pedigree and further study is needed.
    Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 10/2008; 37(5):494-8.
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    ABSTRACT: To investigate the effect of hyperbaric oxygen(HBO)therapy on mitochondrial free radicals after transient focal cerebral ischemia in rats. The male SD rats were randomly assigned into two groups, control and HBO groups. All animals were subjected to 90 min intra-luminal middle cerebral artery occlusion (MCAO) with the regional cerebral blood flow monitored in vivo by laser Doppler flowmetry. HBO treatment was performed in a pressure chamber with 100% O(2)(3 ATM 1 h) 3 h after ischemia. Twenty-four hours after ischemia, mitochondria in the ischemic core and penumbra were isolated and the contents of H(2)O(2), O(2)(*-), MDA, SOD, GSH-PX and GSH in mitochondria were measured respectively. After cerebral ischemia-reperfusion, contents of mitochondrial H(2)O(2), O(2)(*-), MDA increased, while the SOD, GSH-PX and GSH in the mitochondria decreased significantly both in the ischemic core and the ischemic penumbra, compared with those in the normal controls(P<0.05). In the ischemic penumbra, HBO therapy increased significantly the content of O(2)(*-)(P<0.05), enhanced the activity of SOD, and decreased the level of MDA (P<0.05). However, HBO therapy did not change the level of MDA, though it also increased the content of O(2)(*-) and the activity of SOD in the ischemic core. HBO therapy had no significant effect on the contents of H(2)O(2), GSH-PX and GSH in the ischemic mitochondria. HBO therapy initiated early after acute transient cerebral ischemia in rats can increase the mitochondrial free radicals level, but also increase the activity of the anti-radical enzymes. HBO treatment inhibits the lipid peroxidation damage of mitochondria in the ischemic penumbra, but not in the ischemic core, which indicates that the mitochondrial function plays a role in the reaction of the free radical in the ischemic area after HBO therapy.
    Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 09/2008; 37(5):437-43.
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    ABSTRACT: We described a female patient with insulinoma who experienced recurrent episodes of automatism, confusion and convulsion. Furthermore, her electroencephalography (EEG) findings resembled the pattern in complex partial seizures with secondary generalization. The interictal EEG showed spikes and sharp waves, as well as focal slowing over the left temporal lobe, and the ictal EEG revealed generalized spikes and sharp waves associated with diffused slowing. She was initially misdiagnosed as pharmacoresistant epilepsy. After the insulinoma was found and surgically removed, her EEG turned normal and she was seizure-free during the 4-year follow-up. This report highlights the need for careful reassessment of all seizures refractory to medication, even for the patients associated with epileptiform discharges on EEG.
    Journal of Zhejiang University SCIENCE B 07/2008; 9(6):496-9. · 1.11 Impact Factor