Med Biol Eng Comput - Spontaneous contractions of isolated rat portal vein under temperature perturbations.

Tópicos

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Resumo

We studied nonlinear dynamics underlying spontaneous rhythmical contractions of isolated rat portal vein. The signals were acquired at four different temperatures important in isolated blood vessels preparations: 4, 22, 37 and 40 degrees C. To characterize the system's nonlinearity, we calculated the largest Lyapunov exponent, sample entropy and scaling exponents. Evidence for nonlinearity was provided by analysis of surrogate data generated from the phase-randomized Fourier transform of the original sequences. Positive values of the largest Lyapunov exponent were obtained for the time series recorded under applied conditions, indicating that the system preserves its chaotic deterministic nature even far from the physiological temperature range. Scaling exponents revealed three distinctive regions with different correlation properties. The calculated measures that characterize the time series obtained at 4 degrees C were significantly different from those derived from data obtained at higher temperatures. System's dynamics becomes more complex or less predictable as temperature approaches physiological value. The computation of the largest Lyapunov exponent, sample entropy and correlation measures gave an insight into the complex dynamics of the isolated blood vessels rhythmicity. We identified different modes of rhythmical contractions of isolated rat portal vein which could improve understanding of possible control mechanisms in vivo.

Resumo Limpo

studi nonlinear dynam under spontan rhythmic contract isol rat portal vein signal acquir four differ temperatur import isol blood vessel prepar degre c character system nonlinear calcul largest lyapunov expon sampl entropi scale expon evid nonlinear provid analysi surrog data generat phaserandom fourier transform origin sequenc posit valu largest lyapunov expon obtain time seri record appli condit indic system preserv chaotic determinist natur even far physiolog temperatur rang scale expon reveal three distinct region differ correl properti calcul measur character time seri obtain degre c signific differ deriv data obtain higher temperatur system dynam becom complex less predict temperatur approach physiolog valu comput largest lyapunov expon sampl entropi correl measur gave insight complex dynam isol blood vessel rhythmic identifi differ mode rhythmic contract isol rat portal vein improv understand possibl control mechan vivo

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