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Differential effects of postconditioning on myocardial stunning and infarction: a study in conscious dogs and anesthetized rabbits.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Couvreur, Nicolas Lucats, Laurence Tissier, Renaud Bizé, Alain Berdeaux, Alain Ghaleh, Bijan |
| Copyright Year | 2006 |
| Abstract | Postconditioning, i.e., brief intermittent episodes of myocardial ischemia-reperfusion performed at the onset of reperfusion, reduces infarct size after prolonged ischemia. Our goal was to determine whether postconditioning is protective against myocardial stunning. Accordingly, conscious chronically instrumented dogs (sonomicrometry, coronary balloon occluder) were subjected to a control sequence (10 min coronary artery occlusion, CAO, followed by coronary artery reperfusion, CAR) and a week apart to postconditioning with four cycles of brief CAR and CAO performed at completion of the 10 min CAO. Three postconditioning protocols were investigated, i.e., 15 s CAR/15 s CAO (n=5), 30 s CAR/30 s CAO (n=7), and 1 min CAR/1 min CAO (n=6). Left ventricular wall thickening was abolished during CAO and similarly reduced during subsequent stunning in control and postconditioning sequences (e.g., at 1 h CAR, 33+/-4 vs. 34+/-4%, 30+/-4 vs. 30+/-4%, and 33+/-4 vs. 32+/-4% for 15 s postconditioning, 30 s postconditioning, and 1 min postconditioning vs. corresponding control, respectively). We confirmed this result in anesthetized rabbits by demonstrating that shortening of left ventricular segment length was similarly depressed after 10 min CAO in control and postconditioning sequences (4 cycles of 30 s CAR/30 s CAO). In additional rabbits, the same postconditioning protocol significantly reduced infarct size after 30 min CAO and 3 h CAR (39+/-7%, n=6 vs. 56+/-4%, n=7 of the area at risk in postconditioning vs. control, respectively). Thus, contrasting to its beneficial effects on myocardial infarction, postconditioning does not protect against myocardial stunning in dogs and rabbits. Conversely, additional episodes of ischemia-reperfusion with postconditioning do not worsen myocardial stunning. |
| Starting Page | 461 |
| Ending Page | 463 |
| Page Count | 3 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://ajpheart.physiology.org/content/ajpheart/291/3/H1345.full.pdf |
| PubMed reference number | 16565317v1 |
| Volume Number | 291 |
| Issue Number | 3 |
| Journal | American journal of physiology. Heart and circulatory physiology |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Canis familiaris Chimaphila umbellata Coronary Artery Disease Coronary Occlusion Depressive disorder Dog family Glycyrrhiza uralensis Myocardial Infarction Myocardial Ischemia Myocardial Stunning Occlusion of artery (disorder) Old World rabbit Protocols documentation Reperfusion Injury Reperfusion Therapy Tritium Wall of ventricle |
| Content Type | Text |
| Resource Type | Article |
