Effect of ischemic zone size on nonischemic zone function

T. Aversano, P. N. Marino

Research output: Contribution to journalArticle

Abstract

To study the influence of ischemic zone size on function in nonischemic regions, wall thickening and the end-systolic pressure-thickness (ESPTR) relationship were measured before and during a 90-s coronary occlusion, which produced either a small or large (24 or 35% of left ventricular mass) area of ischemia. With both size ischemic areas, nonischemic zone isovolumic and ejection phase wall thickening increased during occlusion, primarily because of increased preload and, to a lesser extent, a reduced pressure component of afterload. The nonischemic region ESPTR was unchanged from preocclusion control with small ischemic mass. With larger ischemic mass, the nonischemic region ESPTR was shifted downward and to the left, indicating reduced end-systolic performance. The decline in the nonischemic zone ESPTR with large ischemic zone size was not due to reduced blood flow, shortening deactivation, reflex effects, or 'tethering' but rather to the associated decline in coronary perfusion pressure. Thus the increase of nonischemic region wall thickening during acute ischemia is due to a change in ventricular loading conditions and not augmentation of contractile performance. Larger ischemic zone size can impair function in nonischemic myocardium by reducing the erectile component of end-systolic performance.

Original languageEnglish (US)
Pages (from-to)H1786-H1795
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume258
Issue number6 27-6
DOIs
StatePublished - 1990

Keywords

  • ischemic zone mass
  • left ventricular
  • regional ventricular function

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Effect of ischemic zone size on nonischemic zone function'. Together they form a unique fingerprint.

  • Cite this