Zonisamide suppresses the tonic phase but not the clonic phase of generalized seizures in developing rats

2010 ◽  
Vol 92 (2-3) ◽  
pp. 244-248 ◽  
Author(s):  
Pavel Mareš
1991 ◽  
Vol 260 (5) ◽  
pp. R934-R940
Author(s):  
D. Paydarfar ◽  
F. L. Eldridge ◽  
S. C. Scott ◽  
R. T. Dowell ◽  
P. G. Wagner

We studied the effects on breathing of seizures induced by focal injection of penicillin G into the parietal cortex in 13 anesthetized cats. Electrocorticograms, ventilation, end-tidal PCO2, and intrapleural and arterial pressures were monitored; changes of these variables were related to the stages of motor seizure. The first respiratory responses, tachypnea and hyperpnea, usually occurred before any peripheral muscular contractions developed. Progression of the seizure was always accompanied by further tachypnea and hyperpnea. The hyperpnea associated with all stages of seizure activity resulted in hypocapnia, which was sustained even during prolonged tonic-clonic motor convulsions that caused a threefold increase of metabolic rate. The extreme tachypnea of tonic generalized convulsions led to increased end-expiratory lung volume because of dynamic hyperinflation associated with very short expiratory durations in the tonic phase. We suggest that the profound effects of seizures on respiration are by feedforward mechanisms from the cortical focus itself and from subcortical circuits, such as hypothalamus, that become involved during seizure propagation and generalization. Peripheral respiratory feedback mechanisms are not important for the genesis of seizure-induced hyperpnea.


2008 ◽  
pp. 789-792
Author(s):  
P Mareš

GABA-B receptor agonist SKF97541 exhibits age-dependent anticonvulsant and proconvulsant actions in developing rats. It suppressed tonic phase of generalized seizures induced by pentetrazol in 7-, 12- and 18-day-old rats and increased their latency in 7- and 12-day-old animals. Other results in 18-day-old animals are not so clear. SKF97541 blocked the appearance of minimal clonic seizures, but tended to decrease latencies of both types of seizures. In addition, it significantly decreases latency of generalized seizures in adult rats. The mixed effects of SKF97541 are in agreement with those of baclofen but there are substantial differences between the actions of these two agonists in individual age groups.


2009 ◽  
pp. 927-930
Author(s):  
P Mareš

GABA exhibits depolarizing action in the immature neurons due to high intracellular activity of chloride ions. It is maintained by cation-chloride cotransporter NKCC1 which is present in immature brain. Bumetanide is a specific inhibitor of this cotransporter. We studied possible anticonvulsant activity of bumetanide in pentylenetetrazol-induced seizures in three age groups of rat pups (7, 12, and 18 days old). Pretreatment with bumetanide (0.2-1 mg/kg i.p.) resulted in dose-dependent decrease of incidence of the tonic phase of generalized tonicclonic seizures in 12-day-old rats only. No effect was observed in younger and older animals. Higher dose of bumetanide (2.5 mg/kg) did not affect tonic convulsions but, on the contrary, decreased latencies of generalized seizures in 12-day-old animals. Lack of marked anticonvulsant effect is probably due to relative maturity of neurons in the brainstem where the generator of generalized seizures is localized. Age- and dosespecific suppression of the tonic phase needs further analysis.


2011 ◽  
Vol 3 (8) ◽  
pp. 552-555
Author(s):  
Dr Borse .R.T Dr Borse .R.T ◽  
◽  
D B Kadam D B Kadam ◽  
Dr Gautam Vaggar ◽  
P S Borle P S Borle

2013 ◽  
Vol 154 (33) ◽  
pp. 1312-1316 ◽  
Author(s):  
Gábor Pocsay ◽  
Andrea Gazdag ◽  
József Engelhardt ◽  
István Szaniszló ◽  
Zoltán Szolnoki ◽  
...  

The authors present a case report and review the literature on Hashimoto encephalopathy. The onset of the disease may be marked by focal and then progressively generalized seizures or other neurological symptoms, but a cognitive decline or various psychiatric symptoms may also emerge. High levels of anti-thyroid peroxidase antibodies and/or anti-thyroglobulin antibodies are present in the serum. Corticosteroid treatment usually results in an improvement of symptoms. The syndrome is frequently overlooked and, therefore, the authors strongly recommend testing serum thyroid autoantibodies in cases with encephalopathy of unknown origin independently on the presence of thyroid disease in the patient or family history. The importance of long-term immunosuppressive treatment should also be stressed. Orv. Hetil., 2013, 154, 1312–1316.


2021 ◽  
Vol 89 (5) ◽  
pp. 1023-1035
Author(s):  
Ian C. Wenker ◽  
Frida A. Teran ◽  
Eric R. Wengert ◽  
Pravin K. Wagley ◽  
Payal S. Panchal ◽  
...  

2020 ◽  
Vol 7 (Supplement_1) ◽  
pp. S244-S244
Author(s):  
Bharath Pendyala ◽  
Prasanth Lingamaneni ◽  
Patricia DeMarais ◽  
Lakshmi Warrior ◽  
Gregory Huhn

Abstract Background Neurocysticercosis is a Neglected Tropical Disease and an important public health issue. Our goal was to collect and analyze data regarding clinically significant gender differences among our Neurocysticercosis patients. Methods A retrospective chart search with ICD 9/ ICD 10 diagnostic code for Neurocysticercosis and neuroimaging suggestive of Neurocysticercosis was performed for clinical encounters in the hospital or affiliated clinics between years 2013–2018. After a careful chart review, patients who were clinically diagnosed with Neurocysticercosis were included in the study. T-test was used to compare means of continuous variables and chi-square test to compare proportions of categorical variables. Results Among 90 total patients included, male (49.4%) and female (50.6%) distribution were nearly identical. The mean age in females was found to be higher than males (52.5 vs 42.0, P < 0.0001). Almost an equal number of males and females presented with either seizures (63.6% vs 57.8%, P= 0.85), headaches (25.0% vs 28.9%, p= 0.85), or other symptoms (11.4% vs 13.3%, p= 0.85). Males had more generalized seizures compared to females (60% vs 38%, P= 0.37), although this result was not statistically significant. Females were more likely to present with > 1 lesion (82.2% vs 56.8%, P= 0.01). Males were more likely to have cystic lesions (64.7% vs 27.9%, P < 0.001) compared to females who had more calcified lesions on presentation (65.1% vs 20.6%, P < 0.001). Male patients were more likely to have contrast enhancement or edema surrounding the lesions (61.4% vs 33.3%, P= 0.01) and were more likely to require treatment with Albendazole/Praziquantel (75.8% vs 31.7%, P < 0.001). Conclusion Although previously reported data is limited, there is a suggestion that there are gender differences in host immune response and that inflammation surrounding parenchymal lesions is more intense in females. This study suggests that men either present early in the disease phase or have different immune responses than women and require anti-parasitic therapy more frequently. More research in this aspect is needed. Disclosures All Authors: No reported disclosures


2020 ◽  
Vol 165 ◽  
pp. 106378
Author(s):  
Francisco Javier Montoya Gutiérrez ◽  
Mónica Díaz Román ◽  
Dolors Cerveró Albert

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