Investigation of the effects of magnetic field exposure on febrile seizure latency, seizure duration, and electroencephalographic recordings in a rat febrile convulsion model

To investigate the effects of a magnetic field (MF) on febrile seizure latency, seizure duration, and electroencephalographic (EEG) recordings in a rat febrile convulsion model. Materials and methods: Thirty-six rats were randomly allocated into 1 of 6 groups: sham group (S), febrile convulsion (FC) group without MF exposure, MF group without FC, group exposed to MF before FC (MF + FC), group exposed to MF after FC (FC + MF), and group exposed to MF before and after FC (MF + FC + MF). The rectal temperature after febrile seizure induction, seizure latency, seizure duration, and EEG recordings were recorded for all animals. Results: Repeated hyperthermic exposure decreased the seizure latency and duration. The effect of the MF was more prominent on seizure duration than on latencies. MF exposure for 10 or 12 days increased seizure latency. MF exposure increased the pathologic theta and delta waves and decreased the beta waves, which are frequently seen in awake animals. Conclusion: Our results suggest that MF exposure has a negative effect on brain waves, and this effect becomes more evident with prolonged exposure. On the other hand, MF exposure significantly decreased the convulsion durations.

Investigation of the effects of magnetic field exposure on febrile seizure latency, seizure duration, and electroencephalographic recordings in a rat febrile convulsion model

To investigate the effects of a magnetic field (MF) on febrile seizure latency, seizure duration, and electroencephalographic (EEG) recordings in a rat febrile convulsion model. Materials and methods: Thirty-six rats were randomly allocated into 1 of 6 groups: sham group (S), febrile convulsion (FC) group without MF exposure, MF group without FC, group exposed to MF before FC (MF + FC), group exposed to MF after FC (FC + MF), and group exposed to MF before and after FC (MF + FC + MF). The rectal temperature after febrile seizure induction, seizure latency, seizure duration, and EEG recordings were recorded for all animals. Results: Repeated hyperthermic exposure decreased the seizure latency and duration. The effect of the MF was more prominent on seizure duration than on latencies. MF exposure for 10 or 12 days increased seizure latency. MF exposure increased the pathologic theta and delta waves and decreased the beta waves, which are frequently seen in awake animals. Conclusion: Our results suggest that MF exposure has a negative effect on brain waves, and this effect becomes more evident with prolonged exposure. On the other hand, MF exposure significantly decreased the convulsion durations.

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  • Morimoto K, Fahnestock M, Racine RJ. Kindling and status epilepticus models of epilepsy: rewiring the brain. Prog Neurobiol 2004; 73: 1–60.
  • Duncan JS, Sander JW, Sisodiya SM, Walker MC. Adult epilepsy. Lancet 2006; 367: 1087–1100.
  • Verity CM, Butler NR, Golding J. Febrile convulsions in a national cohort followed up from birth. Prevalence and recurrence in the first five years of life. Br Med J 1985; 290: 1307–1310.
  • French JA, Williamson PD, Thadani VM, Darcey TM, Mattson RH, Spencer SS, Spencer DD. Characteristics of medial temporal lobe epilepsy: I. Results of history and physical examination. Ann Neurol 1993; 34: 774–780.
  • Cendes F. Febrile seizures and mesial temporal sclerosis. Curr Opin Neurol 2004; 17: 161–164.
  • Lhatoo SD, Wong IC, Polizzi G. Long-term retention rates of lamotrigine, gabapentin, and topiramate in chronic epilepsy. Epilepsia 2000; 41: 1592–1596.
  • Perucca E. Marketed new antiepileptic drugs: are they better than old-generation agents? Ther Drug Monit 2002; 24: 74–80.
  • French J. Refractory epilepsy: one size does not fit all. Epilepsy Curr 2006; 6: 177–180.
  • Dobson J, St Pierre TG, Fuller M, Moser S, Wieser HG. Changes in paroxysmal brainwave patterns of epileptics by weak-field magnetic stimulation. Bioelectromagnetics 2000; 21: 94–99.
  • Spencer SS. When should temporal-lobe epilepsy be treated surgically? Lancet Neurol 2002; 1: 375–382.
  • Gasior M, Rogawski MA, Hartman AL. Neuroprotective and disease-modifying effects of the ketogenic diet. Behav Pharmacol 2006; 17: 431–439.
  • De Herdt V, Boon P, Ceulemans B, Hauman H, Lagae L, Legros B, Sadzot B, Van Bogaert P, Van Rijkevorsel K, Verhelst H et al. Vagus nerve stimulation for refractory epilepsy: a Belgian multicenter study. Eur J Paediat Neurol 2007; 11: 261–269.
  • Bell GB, Marino AA, Chesson AL. Frequency-specific blocking in the human brain caused by electromagnetic fields. Neuroreport 1994; 5: 510–512.
  • Classen J, Witte OW, Schlaug G, Seitz RJ, Holthausen H, Benecke R. Epileptic seizures triggered directly by focal transcranial magnetic stimulation. Electroenceph Clin Neurophysiology 1995; 94: 19–25.
  • Dobson J, Fuller M, Moser S, Wieser HG, Dunn JR, Zoeger J. Evocation of epileptiform activity by weak DC magnetic fields and iron biomineralization in the human brain. In: Baumgartner C, Deecke L, Stroink G, Williamson SJ, editors. Biomagnetism: Fundamental Research and Applications. Amsterdam, the Netherlands: Elsevier; 1995. pp. 16–19.
  • Nealis JG, Rosman NP, De Piero TJ, Ouellette EM. Neurological sequelae of experimental febrile convulsions. Neurology 1978; 28: 246–250.
  • Jiang W, Duong TM, De Lanerolle NC. The neuropathology of hyperthermic seizures in the rat. Epilepsia 1999; 40: 5–19.
  • Ateş N, Akman Ö, Karson A. The effects of the immature rat model of febrile seizures on the occurrence of later generalized tonic–clonic and absence epilepsy. Brain Res Dev Brain Res 2005; 154: 137–140.
  • Gulturk S, Demirkazik A, Kosar I, Cetin A, Dokmetas HS, Demir T. Effect of exposure to 50 Hz magnetic field with or without insulin on blood-brain barrier permeability in streptozotocin-induced diabetic rats . Bioelectromagnetics 2010; 31: 262–269.
  • Kavak K, Emre M, Meral I, Unlugenc H, Pelit A, Demirkazik A. Repetitive 50 Hz pulsed electromagnetic field ameliorates the diabetes-induced impairments in the relaxation response of rat thoracic aorta rings. Int J Radiat Biol 2009; 85: 1–8.
  • Cendes F, Andermann F, Dubeau F, Gloor P, Evans A, JonesGotman M, Olivier A, Andermann E, Robitaille Y, LopesCendes I et al. Early childhood prolonged febrile convulsions, atrophy and sclerosis of mesial structures, and temporal lobe epilepsy: an MRI volumetric study. Neurology 1993; 43: 1083– 10
  • Dube C, Chen K, Eghbal-Ahmadi M, Brunson K, Soltesz I, Baram TZ. Prolonged febrile seizures in the immature rat model enhance hippocampal excitability long term. Ann Neurol 2000; 47: 336–344.
  • Gulec G, Noyan B. Do recurrent febrile convulsions decrease the threshold for pilocarpine-induced seizures? Effects of nitric oxide. Brain Res 2001; 126: 223–228.
  • Bender RA, Dube C, Gonzalez-Vega R, Mina EW, Baram TZ. Mossy fiber plasticity and enhanced hippocampal excitability, with-out hippocampal cell loss or altered neurogenesis, in an animal model of prolonged febrile seizures. Hippocampus 2003; 13: 399–412.
  • Tanabe T, Suzuki S, Hara K, Shimakawa S, Wakamiya E, Tamai H. Cerebrospinal fluid and serum neuron-specific enolase levels after febrile seizures. Epilepsia 2001; 42: 504–507.
  • Lahat E, Livne M, Barr J, Katz Y. Interleukin-beta levels in serum and cerebrospinal fluid of children with febrile seizures. Ped Neurol 1997; 17: 34–36.
  • Klauenberg BJ, Sparber SB. A kindling-like effect induced by repeated exposure to heated water in rats. Epilepsia 1984; 25: 292–301.
  • Ossenkopp KP, Cain DP. Inhibitory effects of powerlinefrequency [60 Hz] magnetic fields on pentylenetetrazolinduced seizures and mortality in rats. Behav. Brain Res 1991; 44: 211–216.
  • Keskil IS, Keskil ZA, Canseven AG, Seyhan N. No effect of 50 Hz magnetic field observed in a pilot study on pentylenetetrazolinduced seizures and mortality in mice. Epilepsy Res 2001; 44: 27–
  • Palmer GC, Borrelli AR, Hudzik TJ, Sparber S. Acute heat stress model of seizures in weanling rats: Influence of prototypic antiseizure compounds. Epilepsy Res 1998; 30: 203–217.
  • Morimoto T, Nagao H, Sano N, Takahashi M, Matsuda H. Electroencephalographic study of rat hyperthermic seizures. Epilepsia 1991; 32: 289–293.
  • Carpentier P, Foquin A, Dorandeu F, Lallement G. Delta activity as an early indicator for soman-induced brain damage: a review. Neurotoxicology 2001; 22: 299–315.
  • Shandra AA, Godlevsky LS, Vastyanov RS, Oleinik AA, Konovalenko VL, Rapoport EN, Korobka NN. The role of TNF-α in amygdala kindled rats. Neurosci Res 2002; 42: 147– 1
  • Fukuda M, Suzuki Y, Ishizaki Y, Kira R, Kikuchi C, Watanabe S, Hino H, Morimoto T, Hara T, Ishii E. Interleukin-1β enhances susceptibility to hyperthermia-induced seizures in developing rats. Seizure 2008; 10: 1–4.
Turkish Journal of Medical Sciences-Cover
  • ISSN: 1300-0144
  • Yayın Aralığı: Yılda 6 Sayı
  • Yayıncı: TÜBİTAK
Sayıdaki Diğer Makaleler

Relationship of admission neutrophil-to-lymphocyte ratio with in-hospital mortality in patients with acute type I aortic dissection

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A comparison of the effects of hyperbaric and isobaric bupivacaine spinal anesthesia on hemodynamics and heart rate variability*

Gülşen BİCAN, İlke İŞİTEMİZ, Tümay YANARAL ULUDAĞ, İbrahim AKKOÇ, Sinan UZMAN, Mehmet TOPTAŞ

Thromboelastography in the evaluation of coagulation disorders in patients with sepsis

Yeliz KILIÇ, İsmet TOPÇU, Hamza BAMBAL, Melek ÇİVİ

New hemostatic agent: the effect of Ankaferd Blood Stopper on healing wounds in experimental skin incision model

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Anti TNF-a therapy might be responsible for an increased incidence of varicocele in patients with ankylosing spondylitis

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Hasan Kutluk PAMPAL, Yusuf ÜNAL, Berrin IŞIK, Hatice Zerrin ÖZKÖSE, Recep Şahin YARDIM

Comparison of different ligation techniques in laparoscopic varicocelectomy*

Işıl BAŞARA, Aliseydi BOZKURT, Mutlu ATEŞ, Yiğit AKIN, Barış NUHOĞLU, Selçuk YÜCEL, Orçun ÇELİK

Prevalence study of genital tract infections in pregnant women referred to health centers in Iran

Mahmoud MOBASHERI, Narges Saeedi VARNAMKHAST, Ali KARIMI, Shayesteh BANAEIYAN

Evaluation of hepatocellular carcinoma with computed tomography perfusion imaging

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Comparison of disc and body volumes in degenerated and nondegenerated lumbar discs: a stereological study

Tuncay KANER, Ahmet SONGUR, Muhsin TOKTAŞ, Ozan Alper ALKOÇ, Olcay ESER, Mustafa EFENDİOĞLU