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Efficiency of Cardiac Contraction in Ischemic Heart Studied in Conscious Dogs

Research Project

Project/Area Number 01570493
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Circulatory organs internal medicine
Research InstitutionKyushu University

Principal Investigator

SUNAGAWA Kenji  Kyushu University Faculty of Medicine Assistant Professor, 医学部, 講師 (50163043)

Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1990: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsoptimal heart / optimal load / end-systolic elastance / conscious dogs / cardiac efficiency / Optimal heart / Optimal Afterload / end-systolic pressure-volume relation / Ventriculo-arterial coupling
Research Abstract

We investigated how natural stresses affects efficiency of ventricular contraction in conscious dogs under the control condition, exercise and left ventricular dysfunction. We evaluated efficiency of ventricular contraction and its coupling with the arterial system in terms of optimal load and optimal heart. The optimal load is defined as that which extracts maximal work from a given ventricle. The optimal heart is defined as that which meets peripheral demand with minimum oxygen cost per unit time. Under the control condition at rest, the arterial system extract more than 95% of maximal external work from a given heart. At the same time, the hearts supplied flow to the peripheral system with a nearly minimum oxygen cost. With exercise, heart rate and cardiac output were nearly doubled. Both end-systolic elastance (Ees) and effective arterial elastance were increased while their ratio remained unchanged. Despite large changes in hemodynamics, external work of the heart was close to its maximal value. The oxygen consumption of the heart was also close to minimum in the presence of dramatically increased peripheral demand. Creation of cardiac dysfunction significantly increased the oxygen consumption of the heart. The external work of the heart, however, remained close to its maximal values. We conclude that the normal heart generates maximal external work with minimum oxygen cost during exercise as well as at rest. Deterioration of left ventricular function significantly lowers these optimalities.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] SugimachiM.: "A new method to identify dynamic transduction properties of the aortic baroreceptors in anesthetized rabbits." Am J Physiol (Heart Circ Physiol 27). 258. H887-H895 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Anan T.: "Arrhythmia anaiysis by successive RR plotting." J Electrocardiol. 23. 243-248 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Sugimachi M.: "Optimal afterload for the heart Vs.optimal heart for the afterload." Frontiers Med Biol Eng. 2. 217-227 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hayashida K.: "Mechanical matching of the left ventricle with the arterial system in exercising dogs." Circ Res.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Suyama A.: "Identification of the rate dependent functional refractory period of the atrioーventricular node in simulated atrial fibrillation studied in isolated crosscirculated canine hearts." Am Heart J.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kubota T.: "Autoregressive analysis of aortic input impedance: Comparison with Fourier transform." Am J Physiol (Heart Circ Physiol).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Sunagawa K.: "Ventriculoーarterial matching in exercising dogs. In “Analysis and simulation of the cardiac systemischemia" edited by Sideman." CRC Press,Florida, 471 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Sunagawa K.: "Ventricular matching with the arterial system in instrumented dogs.In “Cardiac Mechanics and Function in the Normal and Diseased Heart" edited by Hori M et al." SpringerーVerlag,Tokyo, 353 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Sugimachi M.: "A new method to identify dynamic transduction properties of the aortic baroreceptors in anesthetized rabbits." Am. J. Physiol.258 (Heart Circ. Physiol 27). H887-H895 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Anan T: "Arrhythmia analysis by successive RR plotting." J. Electrocardiol.23. 243-248 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Sugimachi M: "Optimal afterload for the heart vs. optimal heart for the afterload." Frontiers Med. Biol. Eng.2. 217-227 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hayashida K.: "Mechanical matching of the left ventricle with the arterial system in exercising dogs." Circ. Res.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Suyama A.: "Identification of the rate dependent functional refractory period of the atrio-ventricular node in simulated atrial fibrillation studied in isolated cross-circulated canine hearts." Am. Heart. J.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kubota T.: "Autoregressive analysis of aortic input impedance : Comparison with Fourier transform." Am. J. Physiol. (Heart Circ. Physiol).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Sunagawa K.: "Ventriculoarterial matching in exercising dogs." "Analysis and simulation of the cardiac system-ischemia" edited by Sideman.CRC Press, Florida. 1989 (89-9)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Sunagawa K.: "Ventricular matching with the arterial system in chronically instrumented dogs." "Cardiac Mechanics and Function in the Normal and Diseased Heart" edited by Hori M, Suga H, Baan J, Yellin EL.Springer-Verlag, Tokyo, 1989. 207-210

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Sugimachi M.: "A new method to identify dynamic transduction properties of the aortic baroreceptors in anesthetized rabbits." Am J Physiol (Heart Circ Physiol 27). 258. H887-H895 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Anan T.: "Arrhythmia anaiysis by successive RR plotting." J Electrocardiol. 23. 243-248 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Sugimachi M.: "Optimal afterload for the heart Vs.optimal heart for the afterload." Frontiers Med Biol Eng. 2. 217-227 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Hayashida k.: "Mechanical matching of the left ventricle with the arterial system in exercising dogs." Circ Res.

    • Related Report
      1990 Annual Research Report
  • [Publications] Suyama A.: "Identification of the rate dependent functional refractory period of the atrioーventricular node in simulated atrial fibrillation studied in isolated crosscirculated canine hearts." Am Heart J.

    • Related Report
      1990 Annual Research Report
  • [Publications] Kubota T.: "Autoregressive analysis of aortic input impedance:Comparison with Fourier transform." Am J Physiol (Heart Circ Physiol).

    • Related Report
      1990 Annual Research Report
  • [Publications] Anan T et al.: "Arrhythmia analysis by successive RR plotting" J Electrocardiol.

    • Related Report
      1989 Annual Research Report
  • [Publications] Sugimachi M,et al.: "A new method to identify dynamic transduction properties of the aortic baroreceptors" Am J Physiol.

    • Related Report
      1989 Annual Research Report
  • [Publications] Fukamachi K et al.: "Effects of left heart bypass on right ventricular performance" J Thoracic Cardiovasc Surg.

    • Related Report
      1989 Annual Research Report
  • [Publications] Hayashida K,et al.: "Mechanical matching of the left ventricle with the arterial system in exercising dogs" Circ Res.

    • Related Report
      1989 Annual Research Report
  • [Publications] Sugimachi et al.: "Optimal afterload for the heart vs.optimal heart for the afterload" Frontiers Med Biol Eng.

    • Related Report
      1989 Annual Research Report
  • [Publications] Morita et al.: "Effects of thromboexclusion on arterial input impedance" J Thoracic Cardioasc Surg.

    • Related Report
      1989 Annual Research Report
  • [Publications] Sunagawa et al.: "Ventriculo-arterial matching in exercising dogs.In Analysis and simulation of the cardiac ischemia edited by Sideman et al." CRC press, 471 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Sunagawa et al.: "Ventricular matching with the arterial system in chronically instrumented dogs In Cardiac mechanics and function in the normal and diseased heart edited by Hori et al." Springer-Verlag, 353 (1989)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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