The modelling of spiral autowave (reverberator) on excited surface of the myocardium which appear in the fibrillation of heart was studied. The shape of reverberator is found. The kinematic parameters of spiral autowave were given in our paper.
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The modelling of spiral autowave (reverberator) on excited surface of the myocardium which appear in the fibrillation of heart was studied. The shape of reverberator is found. The kinematic parameters of spiral autowave were given in our paper.
View Article and Find Full Text PDFA single-pass nonlinear interferometer with feedback field rotation is considered. Increasing feedback gain results in excitation of spatial subharmonics that distort optical reverberators, which are basic output patterns of the system. Features of the period-doubling process depend on the number of the reverberator's petals.
View Article and Find Full Text PDF[The modelling of the modes of propagation of SD waves in brain structures taking into account the nonuniform density of the active elements].
Zh Vyssh Nerv Deiat Im I P Pavlova
November 1993
Character of spreading depression (SD) wave propagation was studied on two-dimensional model of excitable tissue. It was shown that strips with diminished density of active elements were of different permeability for the waves depending on their front orientation and curvature. When triggered near the border with a rarefied strip the wave could not penetrate through it and the effect of wave "sliding" along this strip was observed.
View Article and Find Full Text PDFIn experiments with rabbit ventricular tissue sensitivity of two kinds of spiral wave sources of excitation to fast sodium current inhibition was compared. These spiral wave sources were circulation in a ring around an obstacle and circulation in tissue without an obstacle (reverberator). It was observed that after application of antiarrhythmic drugs lidocaine or mexiletine there was a prominent growth of cycle length of reverberator during first few seconds of circulation and a little change of cycle length for the circus movement around obstacle.
View Article and Find Full Text PDFEctopic spiral wave sources--reverberators--were produced in pieces of rabbit atrium and ventricle by an induction of a single properly timed premature impulse. It was found that the cycle length (T) of the ectopic source gradually increased immediately after its appearance in atrial and changed a little bit after its appearance in ventricular tissue. Relationship between changes of T and refractorines of the heart tissues was investigated.
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