Abstract
Pre-clinical studies aimed to test potential anti-epileptogenic therapies by using the animal models of epileptogenesis induced by status epilepticus (SE), highlighted that the early days following the end of this primary insult represent a crucial temporal window for the subsequent development of epilepsy. In this study, we characterized the EEG dynamics during such crucial period of epileptogenesis, according to the conceptual framework of nonlinear dynamical systems. To this aim, we analyzed by recurrence quantification analysis (RQA) the EEG signals associated to the early days of epileptogenesis induced by SE in rodents according to two well-known experimental protocols, i.e., (i) SE induced by electrical stimulation of the hippocampus in rats (n = 7) and (ii) SE induced by the intra-amygdala administration of kainic-acid in mice (n = 6). We show that the EEG signals during the early 1–2 days post-SE are characterized by an enhanced and persistent rate of occurrence of dynamical regimes of intermittency type. This finding is common to both models of SE, hence it could represent the dynamical hallmark of pro-epileptogenic insults and could correlate with the efficacy of such insults to promote functional changes leading to the development of epilepsy. Future works aimed to deepen our findings could lead to the identification of a potential prognostic factor of the development of epilepsy as well as improve the portability of pre-clinical studies aimed to target new potential therapeutics designed to prevent the development of epilepsy.
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Acknowledgments
We wish to thank Prof. Charles Webber, who generously provided the source codes of RQA applications used in this work. We also wish to thank Dr. Giuseppe La Rocca (Italian National Institute of Nuclear Physics, Division of Catania, Italy) and Prof. Giuseppe Barbera (Italian National Institute of Nuclear Physics, Division of Catania and Department of Physics and Astronomy of the University of Catania, Italy) for their technical assistance on the usage of Grid Computing resources and services provided by the Italian Grid Infrastructure (IGI, http://www.italiangrid.it/).
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Rizzi, M., Frigerio, F., Iori, V. (2016). The Early Phases of Epileptogenesis Induced by Status Epilepticus Are Characterized by Persistent Dynamical Regime of Intermittency Type. In: Webber, Jr., C., Ioana, C., Marwan, N. (eds) Recurrence Plots and Their Quantifications: Expanding Horizons. Springer Proceedings in Physics, vol 180. Springer, Cham. https://doi.org/10.1007/978-3-319-29922-8_10
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