Physical determinism in human arterial dynamics

A successful global vector field reconstruction from physiological signals is obtained for the first time. Data are generated by blood pressure and ar terial diameter oscillations by using an arterial catheter with pressure tr ansducer and an ultrasonic echo-tracking system, respectively. Results lead to the unambiguous evidence that such biological systems are characterized by a low-dimensional deterministic dynamical behavior. It is shown that a physiological system can be modelled from the knowledge of its behaviour on ly, as this has yet been done for theoretical systems and for laboratory de signed experiments.