Modelling Plethysmogram Dynamics based on Baroreflex under Higher Cerebral Influences

A model on baroreflex controlled cardiovascular system was proposed by taking into account of influences of higher cerebral center. In addition to abilities of the model to account for observed phenomena, such as RSA, MWSA, and the other baroreflex oscillations, our model was the first one numerically showing, in plausible physiological ranges, the emergence of chaotic dynamics of plethysmograms observed in experiments. Further, we theoretically predicted a relationship, indicating the increased chaoticity in higher cerebral region would lead to an increase of chaoticity in plethysmograms.