Cardiac mechanical dysfunction induced by ischemia-reperfusion in perfused heart isolated from stroke-prone spontaneously hypertensive rats

Tetsuji Itoh, Kohji Abe, Miwa Tokumura, Satoru Hirono, Masao Haruna, Nobuhiro Ibii

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We investigated the difference in mechanical function after ischemia and reperfusion between Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR) or stroke-prone SHR (SHRSP) using the isolated working heart model, in order to examine postischemic mechanical dysfunction in the severely hypertrophied heart. Systolic blood pressure of SHRSP was higher than that of SHR and WKY, and the left ventricular wall in SHRSP was thicker than in WKY. Mechanical dysfunction of the heart during reperfusion following ischemia (11 min) in SHRSP was severer than that in SHR and WKY, and recovery of the cardiac energy charge potential (ECP) level in SHRSP was lower than that in SHR and WKY. Twenty-five, 12 and 11 min-ischemia in WKY, SHR and SHRSP, respectively, caused a similar level of cardiac mechanical damage. Also, the ECP levels were almost equivalent among them at the end of 20 min reperfusion following each time of ischemia. Under each ischemic condition, a Ca2+-channel blocker, diltiazem, and an adenosine potentiator, dilazep, produced a beneficial effect on the post-ischemic dysfunction in SHR and WKY. However, neither cardioprotective drug led to recovery of the mechanical dysfunction of the heart during reperfusion following ischemia in SHRSP. Thus, the severely hypertrophied heart such as that in SHRSP was more susceptible to cardiac reperfusion dysfunction, than the moderately hypertrophied heart such as that in SHR. These results suggest that the cardioprotective effects of drugs may be deteriorated in severe hypertrophied hearts.

Original languageEnglish
Pages (from-to)485-498
Number of pages14
JournalClinical and Experimental Hypertension
Volume26
Issue number6
DOIs
Publication statusPublished - Aug 1 2004
Externally publishedYes

Keywords

  • Cardioprotective drugs
  • Hypertension
  • Hypertrophy
  • Ischemia-reperfusion
  • Isolated working heart
  • SHRSP

ASJC Scopus subject areas

  • Internal Medicine
  • Physiology

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