Correlation-dimension analysis of hemodynamics during left ventricular assistance

T. Yambe, S. Nanka, S. Naganuma, S. Kobayashi, T. Fukuju, K. Tabayashi, A. Tanaka, K. Abe, M. Yoshizawa, H. Takayasu, S. Nitta

Research output: Contribution to journalArticlepeer-review


A nonlinear mathematical technique was utilized to analyze the cardiovascular regulatory system including ventricular assist system (VAS) in various pumping mode. During synchronous mode left ventricular assistance, chaotic attractors of the arterial blood pressures were evident in the phase space. A nonstructured pattern was observed during internal mode left ventricular assistance. These suggest that the cardiovascular control system with VAS-synchronous mode assistance may be a higher order system than the natural heart system; this is in turn suggest that the dynamics are compatible with deterministic chaos.

Original languageEnglish
Pages (from-to)798-803
Number of pages6
JournalJapanese Journal of Artificial Organs
Issue number4
Publication statusPublished - 1996


  • correlation dimension ventricular assist device
  • deterministic chaos
  • fractal
  • lyapunov exponents


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