Quantification of respiratory parameters in patients with temporal lobe epilepsy

Dysfunction affecting cardiac or pulmonary systems has been postulated as a major factor in sudden death in epilepsy (SUDEP). Whilst the majority of studies of cardiorespiratory function have focused on changes during seizures, here we investigate whether epilepsy influences basal respiratory parameters in patients with temporal lobe epilepsy (TLE) during the interictal period. Spirometry was performed in 10 females and 10 males. Measurements of Vital Capacity (VC), Forced Vital Capacity (FVC), Forced Expiratory Volume in the first second (FEV1) and ratios of FEV1 to FVC (FEV1/FVC) were obtained, and these values were analyzed as percentages of predicted values. None of the patients had chronic obstructive pulmonary disease and no significant alterations in respiratory function tests were found among these patients. No association between seizure frequency, antiepileptic drugs and SUDEP could be found in this study. Although the study did not identify any specific respiratory abnormality in TLE patients during the interictal period, re-evaluation of clinical data on pulmonary disorders in people with epilepsy should be better investigated

Epilepsia e morte súbita?: Coma mais peixe! A hipótese de um grupo

Epilepsy is the commonest serious neurological disorder and individuals with epilepsy are at higher risk of death than the general population and sudden unexpected death in epilepsy (SUDEP) is the most important direct epilepsy-related cause of death. Potential pathomechanisms for SUDEP are unknown, but it is very probable that cardiac arrhythmias during and between seizures play a potential role. The ultimate goal of SUDEP research is to develop methods to prevent it and nutritional aspects such as omega-3 fatty acid deficiency may have an interesting role in this scenario. Omega-3 fatty acids reduce the risk of cardiovascular mortality and are important for treating or preventing some neurological diseases, including epilepsy. A dietary modification or nutritional supplements increasing the ingestion of omega-3 fatty acids may help to ''save the brain".A epilepsia é uma das doenças neurológicas sérias mais comuns e está associada a um maior risco de morte do que o observado na população geral e a morte súbita em epilepsia é uma importante causa de morte relacionada à epilepsia. Os potenciais patomecanismos da morte súbita em epilepsia são desconhecidos, mas é bastante provável que arritmias cardíacas durante ou entre as crises tenham um papel preponderante. O objetivo final das pesquisas em morte súbita em epilepsia é o desenvolvimento de métodos que levem à sua prevenção e aspectos nutricionais, como a deficiência de ômega-3 pode ter um papel interessante neste contexto. A suplementação com ômega-3 reduz o risco de mortalidade de origem cardiovascular e é importante no tratamento e prevenção de algumas doenças neurológicas, incluindo a epilepsia. A modificação dietética ou a suplementação nutricional aumentando a ingesta de ômega-3 pode ajudar a "salvar o cérebro".FAPESPCInAPCe-FAPESPINCT/MCT Ministério de Ciência e TecnologiaCNP

Consumo de álcool e morte súbita em epilepsia: uma abordagem experimental

Using the pilocarpine model of epilepsy, we investigated the effects of alcohol consumption on the frequency of seizures in animals with epilepsy as well the underlying a possible association between alcohol intake and sudden unexpected death in epilepsy (SUDEP) occurrence. Rats were divided randomly into two groups: (A) rats with epilepsy and (B) rats with epilepsy that received a daily dose of ethanol solution (350 mg kg-1, i.p.) for 30 days. The basal frequency of seizures observed in the A and B groups during the first 30 days were 3.4±1.5 and 3.2±1.9 seizures per week per animal, respectively. In B group, it was observed a significant seizure increase (11.6±5.3) during the first 2 weeks of alcohol administration and quite interesting, one rat died suddenly after a generalized tonic-clonic seizure during this period. We concluded in our experimental study that exist a possible association between alcohol abuse and SUDEP occurrence.Utilizando o modelo de epilepsia induzido pela pilocarpina, investigamos os efeitos do consumo de álcool sobre a frequência de crises epilépticas em animais com epilepsia, como também uma possível associação entre a ingestão de álcool e ocorrência de morte súbita e inesperada nas epilepsias (SUDEP). Os animais foram randomicamente divididos em dois grupos: (A) ratos com epilepsia e (B) ratos com epilepsia que receberam uma dose diária de etanol (350 mg kg-1, i.p.) por 30 dias consecutivos. A frequência basal de crises epilépticas observadas nos grupos A e B durante os primeiros 30 dias foram de 3,4±1,5 e 3,2±1,9 crises por semana/animal, respectivamente. No grupo B, ocorreu aumento significativo na frequência de crises (11,6±5,3) durante as duas primeiras semanas de administração do álcool e de forma interessante, um animal morreu subitamente após uma crise generalizada tônico-clonica durante esse período. Concluímos em nossa abordagem experimental que existe uma possível associação entre o consumo de álcool e a ocorrência de SUDEP

Sudden unexpected death in an adolescent with epilepsy: All roads lead to the heart?

The incidence of sudden unexpected death in epilepsy (SUDEP) has been estimated from 0.5-1.4/1,000 person-years in people with treated epilepsy, and 9/1,000 person-years in candidates for epilepsy surgery. Potential risk factors for SUDEP include: age, early onset of epilepsy, duration of epilepsy, uncontrolled seizures, seizure type and winter temperatures. The arrythmogenic side-effect of antiepileptic drugs and seizures may increase the risk of SUDEP. In this report, we describe a patient with prolonged post-ictal tachycardia in EEG video recordings with a typical case of SUDEP: a 16-year-old boy with medically intractable complex partial seizures. Magnetic resonance imaging revealed left mesial temporal sclerosis. During non-invasive video-EEG monitoring, the patient presented a post-ictal heart rate increased for five hours. Two months after video-EEG, he died from SUDEP during a tonic-clonic secondary generalized seizure. The possibility of cardiac involvement in the pathogenesis of SUDEP has been suggested by many studies. Evaluation of this patient with EEG-video monitoring, including measurement of heart rate, contributed to an identification of ictal tachycardia that may have played a role in the SUDEP. Premature mortality seems to be increased in patients with epilepsy, and cardiac abnormalities may be a possible cause of SUDEP. (Cardiol J 2011; 18, 2: 194-196

Influência do ritmo circadiano na morte súbita inesperada em epilepsia

Universidade de São Paulo Faculdade de Medicina de Ribeirão Preto Departamento de Neurologia, Psiquiatria e PsicologiaUniversidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Departamento de FisiologiaUniversidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Disciplina de Neurologia ExperimentalUNIFESP, EPM, Depto. de FisiologiaUNIFESP, EPM, Disciplina de Neurologia ExperimentalSciEL

Effects of residue management on decomposition in irrigated rice fields are not related to changes in the decomposer community

Copyright: © 2015 Schmidt et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Decomposers provide an essential ecosystem service that contributes to sustainable production in rice ecosystems by driving the release of nutrients from organic crop residues. During a single rice crop cycle we examined the effects of four different crop residue management practices (rice straw or ash of burned straw scattered on the soil surface or incorporated into the soil) on rice straw decomposition and on the abundance of aquatic and soildwelling invertebrates. Mass loss of rice straw in litterbags of two different mesh sizes that either prevented or allowed access of meso- and macro-invertebrates was used as a proxy for decomposition rates. Invertebrates significantly increased total loss of litter mass by up to 30%. Initially, the contribution of invertebrates to decomposition was significantly smaller in plots with rice straw scattered on the soil surface; however, this effect disappeared later in the season. We found no significant responses in microbial decomposition rates to management practices. The abundance of aquatic fauna was higher in fields with rice straw amendment, whereas the abundance of soil fauna fluctuated considerably. There was a clear separation between the overall invertebrate community structure in response to the ash and straw treatments. However, we found no correlation between litter mass loss and abundances of various lineages of invertebrates. Our results indicate that invertebrates can contribute to soil fertility in irrigated paddy fields by decomposing rice straw, and that their abundance as well as efficiency in decomposition may be promoted by crop residue management practices

Severe Obesity Shifts Metabolic Thresholds but Does Not Attenuate Aerobic Training Adaptations in Zucker Rats

Severe obesity affects metabolism with potential to influence the lactate and glycemic response to different exercise intensities in untrained and trained rats. Here we evaluated metabolic thresholds and maximal aerobic capacity in rats with severe obesity and lean counterparts at pre- and post-training. Zucker rats (obese: n = 10, lean: n = 10) were submitted to constant treadmill bouts, to determine the maximal lactate steady state, and an incremental treadmill test, to determine the lactate threshold, glycemic threshold and maximal velocity at pre and post 8 weeks of treadmill training. Velocities of the lactate threshold and glycemic threshold agreed with the maximal lactate steady state velocity on most comparisons. The maximal lactate steady state velocity occurred at higher percentage of the maximal velocity in Zucker rats at pre-training than the percentage commonly reported and used for training prescription for other rat strains (i.e., 60%) (obese = 78 +/- 9% and lean = 68 +/- 5%, P 0.05), whereas increase in maximal velocity was greater in the obese group (P < 0.05 vs. lean). In conclusion, lactate threshold, glycemic threshold and maximal lactate steady state occurred at similar exercise intensity in Zucker rats at pre- and post-training. Severe obesity shifted metabolic thresholds to higher exercise intensity at pre-training, but did not attenuate submaximal and maximal aerobic training adaptations.Coordination for the Improvement of Higher Education Personnel (CAPES)Univ Fed Sao Paulo, Grad Program Translat Med, Sao Paulo, BrazilUniv Catolica Brasilia, Grad Program Phys Educ & Hlth, Brasilia, DF, BrazilUniv Sao Paulo, Sch Publ Hlth, Dept Nutr, Sao Paulo, BrazilUniv Fed Sao Paulo, Dept Nephrol, Sao Paulo, BrazilSao Paulo State Univ, Dept Phys Educ, Human Performance Lab, Rio Claro, BrazilUniv Fed Sao Paulo, Dept Physiol, Sao Paulo, BrazilUniv Fed Sao Paulo, Grad Program Translat Med, Sao Paulo, BrazilUniv Fed Sao Paulo, Dept Nephrol, Sao Paulo, BrazilUniv Fed Sao Paulo, Dept Physiol, Sao Paulo, BrazilWeb of Scienc

Epileptologistas indicam a estimulação do nervo vago em crianças com epilepsia refratária: uma promessa contra a morte súbita em epilepsia

It is clear that sudden unexpected death in epilepsy (SUDEP) is mainly a problem for people with refractory epilepsy, but our understanding of the best way to its prevention is still incomplete. Although the pharmacological treatments available for epilepsies have expanded, some antiepileptic drugs are still limited in clinical efficacy. In the present paper, we described an experience with vagus nerve stimulation (VNS) treatment by opening space and providing the opportunity to implement effective preventative maps to reduce the incidence of SUDEP in children and adolescents with refractory epilepsy