Low-level laser irradiation, cyclooxygenase-2 (COX-2) expression and necrosis of random skin flaps in rats

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dc.contributor.authorEsteves I.
dc.contributor.authorMasson I.B.
dc.contributor.authorOshima C.T.F.
dc.contributor.authorPaiotti A.P.R.
dc.contributor.authorLiebano R.E.
dc.contributor.authorPlapler H.
dc.date.accessioned2024-03-13T01:09:08Z
dc.date.available2024-03-13T01:09:08Z
dc.date.issued2012
dc.description.abstractSkin flaps are still a matter of concern among surgeons, as failures can occur leading to flap necrosis. However, low-level laser irradiation has been reported as an effective tool to improve the viability of ischemic flaps, yet its mechanisms of action remain unclear. We investigated the effect of low-level laser irradiation on the viability of random skin flaps in rats and determined COX-2 expression in the flap pedicle. The study animals comprised 24 EPM-1 Wistar rats which were randomly allocated into three equal groups. A cranially based dorsal random skin flap measuring 10×4 cm was created in all the animals. In one group, laser irradiation was simulated (sham group), and in the other two groups the animals were irradiated at 12 points with 0.29 J at 20 mW (energy density 10.36 J/cm2, irradiance 0.71 W/cm2), or with 7.3 J at 100 mW (energy density 260.7 J/cm2, irradiance 3.57 W/cm2). These procedures were applied to the cranial half of the flap immediately after surgery and were repeated on days 2 and 5 after surgery. The percentage necrotic area was determined on day 7 after surgery by the paper template method. The immunohistochemical expression of COX-2 in the samples was given scores from 0 to 3. The necrotic area was smaller in group irradiated at 7.3 J compared to shamtreated group and to the group irradiated at 0.29 J (P<0.05); there was no difference between the sham-treated group and group irradiated at 0.29 J. COX-2 expression was lower in the group irradiated at 7.3 J than in the sham-treated group and the group irradiated at 0.29 J (P<0.001). Low-level laser therapy was effective in decreasing random skin flap necrosis in rats using a laser energy of 7.30 J per point. Laser irradiation also decreased the expression of COX-2 in the flap pedicle. © Springer-Verlag London Ltd 2011.
dc.description.firstpage655
dc.description.issuenumber3
dc.description.lastpage660
dc.description.volume27
dc.identifier.doi10.1007/s10103-011-1011-1
dc.identifier.issn0268-8921
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/36868
dc.relation.ispartofLasers in Medical Science
dc.rightsAcesso Restrito
dc.subject.otherlanguageCOX-2
dc.subject.otherlanguageLLLT
dc.subject.otherlanguageSurgical flap
dc.subject.otherlanguageViability
dc.titleLow-level laser irradiation, cyclooxygenase-2 (COX-2) expression and necrosis of random skin flaps in rats
dc.typeArtigo
local.scopus.citations22
local.scopus.eid2-s2.0-84863432236
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84863432236&origin=inward
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