Deterministic chaos in the hemodynamics of an artificial heart

Tomoyuki Yambe, Shin ichi Nitta, Taro Sonobe, Shigeru Naganuma, Yoshito Kakinuma, Kenji Izutsu, Hiroshi Akiho, Shin ichi Kobayashi, Noboru Ohsawa, Shunsuke Nanka, Motonao Tanaka, Takeo Fukuju, Makoto Miura, Naok Uchida, Naoshi Sato, al et al

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The hemodynamic parameters that occur during prosthetic circulation are analyzed as an entity using non linear mathematical techniques. For purposes of comparing natural and prosthetic circulation, two pneumatically actuated ventricular assist devices were implanted as ventricular bypasses in several experiments using goats. All hemodynamic parameters were recorded during awake conditions. Arterial blood pressure waveform was embedded into a four dimensional space and then projected into a three dimensional phase space. Analysis of the state phase showed the incidence of deterministic chaos during natural circulation, however during artificial circulation a simple tractor was observed. These results suggest that hydrodynamic parameters must be controlled during prosthetic circulation when unexpected stimuli are fed from the outside.

Original languageEnglish
Pages (from-to)84-88
Number of pages5
JournalASAIO Journal
Issue number1
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering


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