Adenosine infusion during early reperfusion failed to limit myocardial infarct size in a collateral deficient species

Mahiko Goto, Tetsuji Miura, Efstathios K. Iliodoromitis, Edward L. O'leary, Row Ishimoto, Derek M. Yellon, Osamu Iimura

Research output: Contribution to journalReview articlepeer-review

64 Scopus citations

Abstract

Study objective - Intracoronary or intravenous adenosine during reperfusion in combination with lignocaine may attenuate "reperfusion injury" and limit myocardial infarct size in the canine heart. The aim of this study was to test whether intravenous adenosine also protects myocardium in the rabbit heart, which lacks xanthine oxidase and significant coronary collaterals in contrast to the canine heart.Design - Five groups of rabbits underwent a 30 min occlusion of the circumflex coronary artery, followed by reperfusion. In adenosine treated groups, either a high dose of adenosine (0.37 mg·kg-1·min-1) with lignocaine treatment (5 mg intravenously 1 min before coronary occlusion and before reperfusion) or a low dose (0.15 mg·kg-1·min-1) of adenosine with or without lignocaine was infused for 60 min starting 5 min before the onset of reperfusion. Group 1 was untreated, while group 2 received a high dose of adenosine with lignocaine. These groups were reperfused for 3 h. Group 3 was untreated, group 4 received a low dose of adenosine, and group 5 a low dose of adenosine and lignocaine. These groups were reperfused for 72 h.Experimental material - 60 anaesthetised open chest rabbits were used. Groups 1 and 2 were killed after 3 h coronary reperfusion. Groups 3, 4, and 5 recovered from surgery for 72 h and were then killed for further study.Measurements and main results - The high dose of adenosine reduced mean blood pressure to 44% of baseline value and diminished reactive hyperaemia in the area at risk by "coronary steal". The low dose of adenosine did not significantly alter systemic blood pressure or heart rate. Infarct size did not differ between groups 1 and 2, at 39.7(SD 20.1)% of area at risk v 33.2(15.9)% (by tetrazolium staining), nor between groups 3, 4, and 5: 50.3(12.6)% v 52.7(15.6)% v 47.8(9.3)% (by histology).Conclusion - Neither a high dose nor a low dose of adenosine limited myocardial infarct size in the rabbit heart even when adenosine was combined with lignocaine treatment.

Original languageEnglish (US)
Pages (from-to)943-949
Number of pages7
JournalCardiovascular research
Volume25
Issue number11
DOIs
StatePublished - Nov 1991

Keywords

  • Adenosine
  • Myocardial infarct size
  • Rabbit
  • Reperfusion

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Adenosine infusion during early reperfusion failed to limit myocardial infarct size in a collateral deficient species'. Together they form a unique fingerprint.

Cite this