Direct evidence that coronary perfusion affects diastolic myocardial mechanical properties in canine heart

Jon R Resar, Robert M. Judd, Henry R Halperin, Vadappuram P. Chacko, Robert George Weiss, Frank C.P. Yin

Research output: Contribution to journalArticle

Abstract

Objective: The effect of coronary perfusion on left ventricular chamber distensibility is only indirect evidence that perfusion alters the mechanical properties of the myocardium. The aim of this study was to demonstrate explicitly the effects of coronary perfusion on these mechanical properties. Methods: The effects of different levels of coronary perfusion were studied both on in-plane stress-strain relations and on transverse stiffness in an isolated, perfused canine interventricular septal preparation. Additionally, to determine the vascular compartment responsible for the mechanical effects of perfusion on tissue properties, we examined the in-plane stress-strain responses and transverse stiffness after embolisation of the vasculature with 15 μm microspheres. Results: The data show a clear dependence of tissue stress-strain properties on perfusion. The in-plane stress-strain relations were shifted to the left and transverse stiffness increased linearly as septal artery perfusion pressure increased. The dependence of both the in-plane stress-strain relations and transverse stiffness on perfusion was significantly decreased following embolisation. Conclusions: Myocardial tissue stiffness is directly related to perfusion. The linear relationship between transverse stiffness and perfusion makes it easier to assess the effects of perfusion on tissue stiffness than with in-plane stress-strain relations. Perfusion of capillaries and/or venules is largely responsible for these alterations in myocardial stiffness.Cardiovascular Research 1993;27:403-410.

Original languageEnglish (US)
Pages (from-to)403-410
Number of pages8
JournalCardiovascular Research
Volume27
Issue number3
DOIs
StatePublished - Jan 1 1993

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Canidae
Perfusion
Venules
Microspheres
Blood Vessels
Myocardium
Arteries
Pressure

Keywords

  • Coronary perfusion
  • Myocardial tissue properties
  • Stiffness
  • Stress-strain

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

Direct evidence that coronary perfusion affects diastolic myocardial mechanical properties in canine heart. / Resar, Jon R; Judd, Robert M.; Halperin, Henry R; Chacko, Vadappuram P.; Weiss, Robert George; Yin, Frank C.P.

In: Cardiovascular Research, Vol. 27, No. 3, 01.01.1993, p. 403-410.

Research output: Contribution to journalArticle

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AB - Objective: The effect of coronary perfusion on left ventricular chamber distensibility is only indirect evidence that perfusion alters the mechanical properties of the myocardium. The aim of this study was to demonstrate explicitly the effects of coronary perfusion on these mechanical properties. Methods: The effects of different levels of coronary perfusion were studied both on in-plane stress-strain relations and on transverse stiffness in an isolated, perfused canine interventricular septal preparation. Additionally, to determine the vascular compartment responsible for the mechanical effects of perfusion on tissue properties, we examined the in-plane stress-strain responses and transverse stiffness after embolisation of the vasculature with 15 μm microspheres. Results: The data show a clear dependence of tissue stress-strain properties on perfusion. The in-plane stress-strain relations were shifted to the left and transverse stiffness increased linearly as septal artery perfusion pressure increased. The dependence of both the in-plane stress-strain relations and transverse stiffness on perfusion was significantly decreased following embolisation. Conclusions: Myocardial tissue stiffness is directly related to perfusion. The linear relationship between transverse stiffness and perfusion makes it easier to assess the effects of perfusion on tissue stiffness than with in-plane stress-strain relations. Perfusion of capillaries and/or venules is largely responsible for these alterations in myocardial stiffness.Cardiovascular Research 1993;27:403-410.

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