Oxidative processes and free radical scavengers in ischaemia-reperfusion injury in adipocutaneous flaps: in vitro lipid peroxidation assessment.
An in vitro lipid peroxidation study measuring Schiff base and TBAR formation in homogenates of the fat and skin fractions of epigastric free flaps of DA-rats was performed to determine the role of oxygen-derived free radicals (ODFRs) in the aetiology of ischaemic injury and of ischaemia and reperfusion injury following cold (0-1 degree C) storage. The storage intervals were 0, 48, 72, 96 and 120 h in the study on ischaemic injury and 72 and 96 h in the study on combined ischaemia and reperfusion injury. Reperfusion was accomplished by anastomosing the pedicle vessels of the flap to the femoral vessels of a recipient; the reperfusion period was 15 min. In addition to a control group (C), three experimental groups were created to test the benefit of a preischaemic single passage perfusion with a hypertonic citrate solution (HCA), a pre- and postischaemic treatment with desferrioxamine (DFX) and a pre- and postischaemic treatment with lipoic acid (LA). The susceptibility of homogenates of skin and fat fractions of epigastric free flaps in DA-rats for lipid peroxidation increased significantly whenever the cold (0-1 degree C) ischaemic interval was prolonged from 0 to 72 h. These findings offer circumstantial evidence for the role of ODFRs in the aetiology of ischaemic injury. Following a short reperfusion period after extended periods of cold (0-1 degree C) ischaemia, no significant increase in susceptibility for lipid peroxidation could be found. Furthermore, no unequivocal role in the prevention of ischaemia and/or reperfusion injury by the use of either HCA, or DFX or LA could be found. The exact role of ODFRs in the aetiology of ischaemia-reperfusion injury in this setting remains unclear.
Werker
P M
PM
Department of Plastic, Reconstructive and Hand Surgery, University Hospital Utrecht, The Netherlands.
Kon
M
M
Green
C J
CJ
Ambrose
I
I
Hildago
A
A
D000273:Adipose Tissue / Q000098:blood supply / Q000378:metabolism; D000818:Animals; D015925:Cryopreservation; D016166:Free Radical Scavengers / Q000378:metabolism*; D007511:Ischemia / Q000378:metabolism; D015227:Lipid Peroxidation; D010084:Oxidation-Reduction; D051381:Rats; D011919:Rats, Inbred Strains; D015427:Reperfusion Injury / Q000378:metabolism*; D012867:Skin / Q000098:blood supply / Q000378:metabolism; D013524:Surgical Flaps; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
D016166:Free Radical Scavengers; D017392:Thiobarbituric Acid Reactive Substances