Faculty Collaboration Database

Dual exposure to sevoflurane improves anesthetic preconditioning in intact hearts. Anesthesiology 2004 Mar;100(3):569-74

Date

04/28/2004

Pubmed ID

15108970

DOI

10.1097/00000542-200403000-00016

Scopus ID

2-s2.0-1442283835 (requires institutional sign-in at Scopus site)   47 Citations

Abstract

BACKGROUND: Anesthetic preconditioning (APC) with sevoflurane reduces myocardial ischemia-reperfusion injury. The authors tested whether two brief exposures to sevoflurane would lead to a better preconditioning state than would a single longer exposure and whether dual exposure to a lower (L) concentration of sevoflurane would achieve an outcome similar to that associated with a single exposure to a higher (H) concentration.

METHODS: Langendorff-prepared guinea pig hearts were exposed to 0.4 mM sevoflurane once for 15 min (H1-15; n = 8) or 0.4 mM (H2-5; n = 8) or 0.2 mM sevoflurane (L2-5; n = 8) twice for 5 min, with a 5-min washout period interspersed. Sevoflurane was then washed out for 20 min before 30 min of global no-flow ischemia and 120 min of reperfusion. Control hearts (n = 8) were not subjected to APC. Left ventricular pressure was measured isovolumetrically. Ventricular infarct size was determined by tetrazolium staining and cumulative planimetry. Values are expressed as mean +/- SD.

RESULTS: The authors found a better functional return and a lesser percentage of infarction on reperfusion in H2-5 (28 +/- 9%) than in H1-15 (36 +/- 8%; P < 0.05), L2-5 (43 +/- 6%; P < 0.05), or control hearts (52 +/- 7%; P < 0.05).

CONCLUSION: These results suggest that APC depends not only on the concentration but also on the protocol used for preconditioning. Similarly to ischemic preconditioning, repeated application of the volatile anesthetic seems to be more important than the duration of exposure in initiating the signaling sequence that elicits APC at clinically relevant concentrations. Therefore, repeated cycles of anesthetic exposure followed by volatile anesthetic-free periods may be beneficial for APC in the clinical setting.

Author List

Riess ML, Kevin LG, Camara AK, Heisner JS, Stowe DF

Author

Amadou K. Camara PhD Professor in the Anesthesiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Anesthetics, Inhalation
Animals
Coronary Circulation
Dose-Response Relationship, Drug
Guinea Pigs
Heart
In Vitro Techniques
Ischemic Preconditioning, Myocardial
Methyl Ethers
Myocardial Infarction
Myocardial Reperfusion Injury
Myocardium
Oxygen Consumption
Ventricular Function, Left