Saratov JOURNAL of Medical and Scientific Research

electroencephalogram (EEG)

Synchronization of low-frequency rhythms in electroencephalogram by respiration with linear dependent time frequency.

Year: 2016, volume 12 Issue: №4 Pages: 541-548
Heading: Physiology and Pathophysiology Article type: Original article
Authors: Karavaev A.S., Runnova A.E., Borovkova E.l., Ishbulatov Y.M., Khorev V.S., Kiselev A.R., Zhuravlev M.O., Ponomarenko V.I., Prokhorov M.D., Bezruchko B.P., Koronovsky A.A..
Organization: Saratov Branch of Institute of Radio Engineering and Electronics n.a. V.A. Kotelnikov, Saratov State Medical University, Saratov state university
Summary:

The aim of the present study was to investigate the features of interaction of low-frequency rhythms in delta band of electroencephalogram (EEG) and processes in vegetative regulation of circulation with respiration. Materials and methods. 19 leads of EEG, photoplethysmogram (PPG) and respiration were simultaneously recorded in four healthy males (19-25 years old) during 30 minutes physiological test with linearly increasing frequency of respiration. Modern methods of nonlinear dynamics were used to diagnose the presence of phase and frequency synchronization between respiration and low-frequency rhythms in delta band of EEG and in PPG. Results. We found significantly long sections of synchronization of delta rhythms in cervical leads of EEG and low-frequency rhythms in PPG by respiration with linearly increasing frequency. Conclusion. Obtained results correlate well with established hypothesis which suggest that low-frequency rhythms in baroreflectory regulation of circulation are in complex dynamic relationships with structures of brain stem. A method was proposed for quantitative evaluation of synchronization strength between respiration and low-frequency rhythms in electrical brain activity in physiological tests with respiration with frequency linearly increasing in time.

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Migreine and periictal headache in patients with epilepsy

Year: 2016, volume 12 Issue: №2 Pages: 278-281
Heading: Neurology Article type: Review
Authors: Muzalevskaia D.S., Korotkov A.G., Kolokolov O.V.
Organization: Saratov State Medical University
Summary:

Migraine and epilepsy are diseases characterized by paroxysmal occurring clinical manifestations that have different mechanisms of pathogenesis. In the interictal period in 59% of patients with epilepsy there are different types of primary headache: 18%, migraine without aura, 33% from tension-type headache, and 8% not classified headache. We have analyzed clinical and electrophysiological pattern in patients with migraine and idiopathic generalized epilepsy. A preliminary analysis of the clinical picture of headaches in adult patients suffering from idiopathic generalized epilepsy suggests that migraine occurs more often in patients with idiopathic generalized epilepsy, whereas among patients with focal symptomatic epilepsy is more common patients with secondary headache

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