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Volatile anesthetics protect the ischemic rabbit myocardium from infarction
D K Cope1, W K Impastato, M V Cohen
1University of South Alabama College of Medicine, Mobile, USA.
Anesthesiology
|March 1, 1997
Summary
Volatile anesthetics significantly reduced myocardial infarction size in rabbits compared to intravenous agents. This cardioprotection involves adenosine receptors and protein kinase C, similar to ischemic preconditioning.
Area of Science:
- Cardiology
- Anesthesiology
- Cardiovascular Research
Background:
- The impact of anesthetic agents on myocardial infarction is not fully understood.
- This study investigates anesthetic effects on infarct size in a rabbit model of ischemia-reperfusion.
Purpose of the Study:
- To evaluate the cardioprotective effects of intravenous and inhalational anesthetics on myocardial infarction.
- To elucidate the mechanisms underlying anesthetic-induced cardioprotection.
Main Methods:
- Utilized in situ and in vitro rabbit heart models subjected to regional ischemia-reperfusion.
- Infarct size was quantified using triphenyltetrazolium chloride staining.
- Investigated the roles of adenosine receptors and protein kinase C in cardioprotection.
Main Results:
- Inhalational anesthetics (halothane, enflurane, isoflurane) reduced infarct size by approximately 50% compared to intravenous agents (pentobarbital, ketamine-xylazine, propofol).
- Cardioprotection was observed in isolated hearts, independent of systemic effects like hypotension.
- Adenosine receptor blockade and protein kinase C inhibition abolished halothane-induced cardioprotection.
Conclusions:
- Volatile anesthetics offer significant cardioprotection against myocardial infarction in rabbits.
- The protective mechanism involves adenosine receptors and protein kinase C, mirroring ischemic preconditioning.
- Intravenous anesthetic agents did not provide similar cardioprotective benefits.