Fractal dimension analysis of the hemodynamics with artificial heart

In order to analyze the hemodynamic properties during total artificial circulation as an entity, not as the decomposed parts, nonlinear mathematical analyzing technique including fractal theory was utilized in the chronic animal experiments using healthy adult goats. For the comparison between the natural and artificial circulation, biventricular bypass type total artificial circulation model was adopted. In the awake condition, hemodynamic time series data without ventricular assistance was recorded for the control study. After that, ventricular fibrillation was induced electrically and biventricular bypass (BVB) pump was started to constitute the BVB type complete prosthetic circulation model. Correlation dimension analysis of the hemodynamics revealed the fact that the series data of the arterial blood pressure may be fractal time series data even during artificial circulation, suggesting the possibility that artificial heart may be able to make the flexible and robust system by the achievement of fractal dynamics.