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Effects of a prophylactic or therapeutic application of perflubron emulsion on myocardial ischaemia–reperfusion injury in rats

Published online by Cambridge University Press:  01 October 2008

C. Rempf ,
T. Standl ,
A. Gottschalk ,
M. Freitag ,
A. Ritter ,
E. Lang ,
S. Tuszynski  and
M. A. Burmeister
C. Rempf*
Affiliation:
University Hospital, Knappschaftskrankenhaus Bochum Langendreer, Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, Bochum
T. Standl
Affiliation:
Academic Hospital Solingen, Department of Anaesthesia and Critical Care Medicine, Solingen
A. Gottschalk
Affiliation:
University Hospital, Knappschaftskrankenhaus Bochum Langendreer, Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, Bochum
M. Freitag
Affiliation:
University Medical Center Hamburg, Department of Anaesthesiology, Hamburg
A. Ritter
Affiliation:
Asklepios Klinikum Nord, Department of Anaesthesiology, Hamburg
E. Lang
Affiliation:
University Hospital Muenster, Department of Anaesthesiology, Muenster, Germany
S. Tuszynski
Affiliation:
University Medical Center Hamburg, Department of Anaesthesiology, Hamburg
M. A. Burmeister
Affiliation:
University Medical Center Hamburg, Department of Anaesthesiology, Hamburg
*
Correspondence to: Christian Rempf, Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, Knappschaftskrankenhaus Bochum Langendreer, In der Schornau 23-25 44892, Bochum, Germany. E-mail: [email protected]; Tel: +49 234 299 3001; Fax: +49 234 299 3009
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Summary

Background and objective

The efficacy of administering a perfluorochemical-based oxygen therapeutic such as perflubron emulsion (Oxygent™) prior to ischaemia is currently unknown, although there is evidence for potential beneficial effects for the perioperative treatment in cardiac risk patients. This experimental study investigated the efficacy of perflubron emulsion in preventing reperfusion injury and myocardial infarction size after coronary ischaemia and reperfusion. The perflubron emulsion was given either in a prophylactic manner, prior to induction of myocardial ischaemia, or as a therapeutic agent given during ischaemia.

Methods

Thirty-two anaesthetized and mechanically ventilated rats were subjected to 25 min occlusion of the left coronary artery followed by 120 min reperfusion. Animals were randomized to one of four groups: Group 1 was treated with administration of 6 g kg−1 intravenous perflubron emulsion 25 min before occlusion; Group 2 received the same dose 10 min after occlusion; and Groups 3 and 4 received no perflubron emulsion. Inspired O2 (FiO2) concentration was maintained at 1.0 in Groups 1, 2 and 3 and at 0.35 in Group 4.

Results

Neither prophylactic nor therapeutic perflubron emulsion treatment reduced infarct size measurements by triphenyltetrazolium-chloride staining or severity of cardiac arrhythmias in comparison to the hyperoxic control group. However, prophylactic application of perflubron emulsion reduced areas of impaired perfusion vs. Group 3 assessed by in vivo staining with Thioflavin-S while no significant effect was seen in Groups 2 and 4 vs. 3. Density of DNA single-strand breaks in the ventricle was increased in all groups ventilated with 100% oxygen.

Conclusion

Although administration of perflubron emulsion did not reduce infarct size, areas of impaired perfusion were significantly mitigated when perflubron emulsion was administered prior to coronary occlusion. However, a high oxygen concentration may provoke DNA strand breaks during reperfusion after ischaemia. Further studies must clarify whether enhanced oxidative stress outweighs the advantage of improved areas of impaired perfusion following perflubron emulsion.

Keywords

PERFLUBRONISCHAEMIA–REPERFUSIONRATMICROCIRCULATIONHEART
Type
Original Article
Information
European Journal of Anaesthesiology , Volume 25 , Issue 10 , October 2008 , pp. 850 - 859
Copyright
Copyright © European Society of Anaesthesiology 2008

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