Turbulence in the canine ascending aorta and the blood pressure

S. Hanai, T. Yamaguchi, S. Kikkawa

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Turbulent velocity fluctuations were measured and analyzed in the canine ascending aorta using a hot-film anemometer. Blood flow rate and temperature were stabilized using a special bypass technique. Blood pressure was elevated by Methoxamine infusion. Turbulence components were extracted from measured data using an ensemble averaging technique. Turbulence intensity correlated best with blood flow rate although the variance was relatively large, especially when the blood flow velocity was high. When pooled data were grouped into subclasses using peak aortic flow velocity as the criteria, turbulence intensity correlated well with aortic systolic blood pressure in each of the subclasses. Spectral bandwidth correlated with aortic pressure in the same manner. In summary, turbulence in the aorta developed when blood pressure was high. Both an increase of turbulence intensity and an widening of turbulence spectra may be ascribed to a stiffening of the aortic wall due to an elevation of blood pressure.

Original languageEnglish
Pages (from-to)107-116
Number of pages10
JournalBiorheology
Volume28
Issue number1-2
DOIs
Publication statusPublished - 1991 Jan 1

Keywords

  • enlargement of aortic arch
  • hemodynamics
  • hot-film anemometer
  • hypertension
  • turbulence

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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