Volume 17, Issue 1 , Pages 41-46, January 1999
Skeletal Muscle Tissue Oxygen Pressure Distribution During Early Reperfusion After Prolonged Ischaemia
Article Outline
Abstract
Objectivesthe aim of this study was to investigate the skeletal muscle tissue oxygen pressure (PtO2) distributions during early reperfusion (10–45 min) after prolonged ischaemia in a rat animal model.Material and methodsskeletal muscle ischaemia was induced in anaesthetised rats by applying a tourniquet on the left thigh for 3 h (group I) or 4 h (group II), and tissue oxygen pressure measurements were made after 10–45 min of reperfusion. Assessment of PtO2was made by a multiwire Clark-type oxygen microelectrode, placed on the surface of the left tibialis anterior muscle.Resultsduring reperfusion a similar PtO2pattern was evaluated after both 3 and 4 h of total ischaemia, where the sum PtO2distributions were shifted to the left associated with low tissue oxygen pressure values. After 10 min of reperfusion the median PtO2was 0.28 kPa and 0.18 kPa, in groups I and II, respectively; after 45 min of reperfusion 0.61 kPa and 0.60 kPa, respectively. The median PtO2in the non-ischaemic muscle in groups I and II were 2.19 and 2.17 Pa.Conclusionthe results show that local skeletal muscle oxygenation is severely impaired during the initial 45 min of reperfusion after both 3 and 4 h of total muscle ischaemia with a slow-reflow phenomenon generally present, despite pronounced needs.
Keywords: ischaemia, reperfusion injury, skeletal muscle, tissue oxygenation.
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- f1 Please address all correspondence to: A. Sirsjö, Cardiovascular Research Unite, Center for Molecular Medicine, L8:03 Karolinska Hospital, S-171 76 Stockholm, Sweden.
PII: S1078-5884(98)90693-1
doi:10.1053/ejvs.1998.0693
© 1999 W.B. Saunders Company. All rights reserved.
Volume 17, Issue 1 , Pages 41-46, January 1999
