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Li Min Li

Publications and source records attributed to Li Min Li.

25 records · Page 2Linked to original sources
PubMed2003

Cerebellar volume and long-term use of phenytoin.

OBJECTIVES: To perform MRI cerebellum volumetry in patients exposed to phenytoin and to identify factors associated with cerebellar atrophy (CA). METHODS: From 100 consecutive epilepsy patients we selected those with phenytoin use for more than 2 months and with MRI scan available for volumetric studies. We obtained cerebellar volumes corrected for total intracranial volume. Volumes below 2 standard deviations from the mean of control group were considered abnormal. RESULTS: We studied 56 patients (33 women). Mean age was 33.6 years and mean duration of epilepsy was 17.6 years. Mean daily dose of phenytoin was 301 mg. CA was detected in 20 (35.7%) patients. CA was not associated with frequent generalised seizures. CA correlated with duration of epilepsy (r=-0.34; P=0.01) and years of treatment with phenytoin (r=-0.48; P=0.001), but not with age and mean daily dosage of phenytoin (P>0.05). However, a multiple correlation analysis as well as a backward stepwise multiple regression analysis including all variables showed that only duration of treatment was significantly associated with CA (P=0.001). CONCLUSIONS: CA is frequently associated with long-term use of phenytoin. Although duration of epilepsy may have an influence in the CA, this is clearly less important than the time of exposure to phenytoin.

Adolescent↗
PubMed2003

Quantification of hippocampal signal intensity in patients with mesial temporal lobe epilepsy.

BACKGROUND: Refractory mesial temporal lobe epilepsy (MTLE) is frequently associated with hippocampal atrophy (HA) and an abnormal hippocampal signal (Hsig) on magnetic resonance imaging (MRI). OBJECTIVE: To quantify Hsig on MRI using a simplified technique. METHODS: The authors included 15 patients with refractory MTLE who underwent surgery and had preoperative MRI with hippocampal volumetry. Hsig was quantified on preoperative coronal T1-weighted and T2-weighted MRI using the NIH-Image program. Hsig was determined for the head, tail, and entire hippocampal extension. Abnormal Hsig was defined when values were above (for T2) or below (for T1) 2 standard deviations from the mean of normal control group. RESULTS: The lateralization of abnormal Hsig values was concordant with electroencephalograms and HA in all patients. There was a significant difference in ipsilateral T2 Hsig between patients and controls (P < .0001), but not for contralateral T2 Hsig. T1 Hsig showed bilateral abnormalities more frequently, whereas T2 Hsig could lateralize better hippocampal abnormalities. Overall, there were no differences when comparing T2 Hsig for the entire hippocampus, head, or tail only. However, there were some individual differences. T2 Hsig abnormalities involved the entire hippocampus in most patients but were restricted to the head in one patient and to the tail in another. CONCLUSIONS: This simplified method for the quantification of Hsig using NHI-Image is an efficient method for the identification and quantification of hippocampal abnormalities in patients with MTLE. The assessment of the entire extension of the hippocampal formation may provide important additional data, compared to T2 relaxometry maps limited to one segment of the hippocampus.

Adult↗
PubMed2002

Neuroimaging characteristics of pseudosubcortical laminar heterotopia.

Subcortical laminar heterotopia (SLH) is a subtype of malformation of cortical development characterized by laminar gray matter between the cortex and ventricles, which can vary in thickness and may be continuous or discontinuous. The objective of this study is to describe a normal finding of high-resolution magnetic resonance imaging that may simulate an SLH. SLH is isointense to cortex on both T1- and T2-weighted/FLAIR images, usually both anteriorly and posteriorly in location. Conversely, pseudo-SLH is a normal variant present only at the posterior aspect of the brain, and with dark signal on both T1- and T2-weighted/FLAIR images.

Brain Diseases↗
PubMed2002

Neuroimaging of acute cerebellitis.

Acute cerebellitis is one of the main causes of acute cerebellar dysfunction in childhood and may be infectious, postinfectious, or postvaccination. The etiology of acute cerebellitis is usually viral. Varicella zoster, Epsten-Barr, rubeola, pertussis, diphtheria, and coxsackie viruses are the most frequently involved agents. Diagnosing of acute cerebellitis can sometimes be difficult because the patient may present only mild cerebellar signs and the examination of cerebrospinal fluid may be normal. The authors present the clinical and neuroimaging findings of 2 patients presenting with acute cerebellitis. Their magnetic resonance imaging showed hyperintense signal of cerebellar gray matter in T2-weighted sequences, which is a strong indication of a diagnosis of acute cerebellitis.

Acute Disease↗
PubMed2002

Focal cortical dysplasia: improving diagnosis and localization with magnetic resonance imaging multiplanar and curvilinear reconstruction.

OBJECTIVE: To establish the contribution of multiplanar reconstruction (MPR) and curvilinear reformatting (CR) to the MRI investigation of focal cortical dysplasia (FCD). METHODS: From a group of patients with intractable frontal lobe epilepsy, we selected patients with neuroimaging diagnosis of FCD. The diagnosis of FCD was based on the neuroimaging findings after a three step evaluation, always in the same order: (a) plain MRI films, (b) MPR, and (c) CR. After the selection of patients, the process of reviewing all the images in the three stages described above was performed by one of us, who did not take part on the selection of patients nor on the initial evaluation, and who was blind to the clinical and EEG findings of the patients. For data analysis, we first assessed the contribution of the additional findings of MPR analysis compared to the results of the evaluation using only plain MRI films, as is usually done in routine practice. Second, we assessed the contribution of CR to the findings of plain MRI films plus MPR. After completing the multistep evaluation, we all went back to review the plain MRI films with knowledge of lesion topography, in order to identify possible subtle features associated with FCD. RESULTS: Seventeen patients met the inclusion criteria. Twelve had imaging diagnosis of FCD and were included in the second step of this project. Plain films of high resolution MRI showed the lesion in 6 (50%) of the 12 patients. By adding MPR to the plain MRI films, we identified lesions in all 12 patients. Furthermore, we found that MPR provided a better lesion localization and ascertainment of its relationship to other cerebral structures in 5 of 6 (83%) patients who had a lesion identified on plain films. By adding CR to the plain MRI films plus MPR analysis, we observed that (a) CR also allowed the identification of the dysplastic lesion in all patients, (b) CR improved lesion localization in one patient, and (c) CR provided a better visualization of the lesion extent in 4 patients (33%), showed a larger lesion in 3, and demonstrated that part of the area suspected as abnormal was more likely volume averaging in 2. CONCLUSION: MPR and CR analysis add to the neuroimaging evaluation of FCD by improving the lesion diagnosis and localization. CR helps to establish the extent of the lesion more precisely, allowing the visualization of some areas not shown on high resolution MRI and MPR. These techniques are complementary and do not replace the conventional wisdom of MRI analysis.

Adolescent↗
PubMedDate not supplied

[Managing epilepsy in the primary care network in Brazil: are health professionals prepared?].

OBJECTIVE: To assess attitudes and beliefs concerning epilepsy held by physicians and allied health professionals who work in the primary care network in Brazil. METHODS: The data were collected during a national family and community medicine conference held in Rio de Janeiro in 2004, which was attended by 1,200 health professionals from throughout the country. Two questionnaires were used, one for physicians and another for nonphysician health workers. RESULTS: A total of 598 conference participants (345 physicians and 253 nonphysician health professionals) completed a questionnaire. Both the physicians and the nonphysician health professionals had acceptable personal attitudes towards persons with epilepsy. According to data from 286 physicians who provided information, the estimated mean percentage of individuals with epilepsy in the populations cared for by the physicians' health care systems in the preceding year was 0.78% (range, 0 to 8%; median = 0.37%). The estimated mean percentage of seizure-free patients was 60%. The estimated mean percentage of persons on monotherapy was 55%. The estimated mean percentage of referrals to a neurologist was 59%. The estimated mean percentage of patients who were working or studying was 56%. Of the 345 physicians, 252 of them (73%) reported not feeling confident about managing individuals with epilepsy, whereas 84 (24%) felt confident, and 9 (3%) were not sure. Of the 252 physicians who did not feel confident, 226 (90%) said that they would participate in a training program to improve the quality of the care provided to individuals with epilepsy. CONCLUSIONS: The professionals participating in the study indicated that the primary care system has the essential elements needed to provide comprehensive epilepsy care, including professional personnel who want to improve their skills. However, establishing an efficient, effective program of epilepsy management in the primary care network will require an effective referral network, regular distribution of antiepileptic drugs, the close monitoring of epilepsy management by using the federal primary health information system, and the ongoing education of health professionals, with emphasis on psychological support and the inclusion in society of individuals with epilepsy.

Adolescent↗