Timing of magnesium therapy affects experimental infarct size

William R. Herzog, Matthew L. Schlossberg, Karen S. MacMurdy, Lisa R. Edenbaum, Matthew J. Gerber, Robert A. Vogel, Victor L. Serebruany

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Controversy exists regarding the use of magnesium in the treatment of acute myocardial infarction (AMI) because of apparent conflicting results from clinical trials. One hypothesis to explain the various clinical observations proposes that tile timing of magnesium administration significantly influences its therapeutic effect; ie, supraphysiological levels of Mg2+ must be present at the time of reperfusion for magnesium to produce clinical benefit. Methods and Results: These experiments evaluated the effect of varying the timing of magnesium administration during AMI. Female Yorkshire swine (34 to 42 kg) underwent thoracotomy and 50 minutes of left anterior descending coronary artery (LAD) occlusion, followed by 3 hours of reperfusion. In the first group, MgSO4 (250 mg of magnesium diluted in 60 cm3 saline) was infused into the LAD over 12 minutes, beginning immediately with the onset of reperfusion (n = 6, Mg- early group). In the second group, MgSO4 was given after 1 hour of reperfusion (n=6, Mg-late group). Six pigs received saline instead of magnesium and served as the control group. Lethal arrhythmias were significantly reduced in the Mg-early group. Infarct size was determined by vital staining. Infarct size was 0.16±0.05 g/kg body wt (Mg-early), 0.35±0.08 g/kg (Mg-late), and 0.42±0.04 g/kg for the control group. Compared with the control group, significant (P=.029) reduction in infarct size occurred in the Mg-early group but not in the Mg-late group. Conclusions: We conclude that intracoronary MgSO4 delivered during reperfusion can significantly diminish infarct size in swine, but the timing of administration is critical.

Original languageEnglish (US)
Pages (from-to)2622-2626
Number of pages5
JournalCirculation
Volume92
Issue number9
DOIs
StatePublished - Nov 1 1995

Keywords

  • magnesium
  • myocardial infarction
  • reperfusion

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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