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

Published

Journal Article

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 microns 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.

Full Text

Duke Authors

Cited Authors

  • Resar, JR; Judd, RM; Halperin, HR; Chacko, VP; Weiss, RG; Yin, FC

Published Date

  • March 1, 1993

Published In

Volume / Issue

  • 27 / 3

Start / End Page

  • 403 - 410

PubMed ID

  • 8490939

Pubmed Central ID

  • 8490939

International Standard Serial Number (ISSN)

  • 0008-6363

Digital Object Identifier (DOI)

  • 10.1093/cvr/27.3.403

Language

  • eng

Conference Location

  • England