Edvaldo Lopes de Almeida

Processo modificado de reprodução e amplificação de imagem para mensuração de área por planimetria: Aplicação em feridas planas produzidas em cães, tratadas por curativos oclusivos de pele de rã

Digital image analysis and planimetry are important tools for evaluation of plain wound areas submitted to local treatment. In the proposed process, perimeters of wound areas were obtained in loco by tracing over transparent sheet and further reproduced and amplified by laser copier, precluding the use of photography and developing. The contraction and granulation areas were then measured by planimeter. Epitelization area were determined by difference between the above mentioned areas. Data from measurements and determinations of areas were further transformed in cumulative Percentage of Wound Contraction (PWC), Wound Epitelization (PWE) and Wound Healing (PWH). The proposed process was tested in square shaped lesions (400 mm2), produced in both right and left thoraco-dorsal surfaces of dogs. Seventeen lesion localized in the right thoraco-dorsal region were treated by Rana catesbeiana skin, previous preserved by hypothermia (Test Group). Another 17 lesions in left thoraco-dorsal surface were treated by moistened gauze (Control Group). PWC, PWE and PWH were evaluated at the 7th, 14th, 21th and 28th POD. Macro and microscopic studies showed skin frog destruction, suggestive of rejection phenomenon. It follows that: 1. Changes in reproducing image process permitted to save costs. The reading error of planimeter was ± 0.5%; 2. PWC, PWE and PWH showed non significant differences between Groups. Such equivalence was attributed to destruction of frog skin, suggestive of rejection process.

Pele de Rana Catesbeiana como curativo biológico oclusivo no tratamento de feridas cutâneas produzidas em cães: Alterações macroscópicas e microscópicas resultantes da interação desses tecidos. Estudo preliminar

Objective: To study the effect of frog skin as occlusive dressing on cutaneous wounds. Methods: Fifteen mongrel dogs, of both sexes, weighing 9.45 ± 2.62 kg, under general anesthesia, were submitted to 34 square shaped skin lesions, with 400 mm2 of area, on both right and left thoracodorsal surfaces. After defrosting, Rana catesbeiana skins preserved in a ClNa and glycerol solution at ¾4oC were used as biological occlusive dressing on 17 lesion located in the right thoracodorsal region (Test Group). The 17 lesions on the left thoracodorsal side were treated with gauze moistened in a 0.9% ClNa solution (Control Group). The frequency of healed (HW) and non-healed wounds (NHW), and the incidence of frog skin destruction, were analyzed. Five sequences of frog skin samples were histologically examined till tissue destruction started to appear. Inflammatory histological findings were evaluated by percentage of intensity of Polymorphonuclear cells (PPMNC), Mononuclear cells (PMC), and lymphoreticular infiltration (PLI). Two tailed Students t test and chi square test (c2) were used as indicated. Results: 1) There was no significant difference in HW and NHW between Groups; 2) There was a 31.00% incidence of frog skin destruction limited to the surface in contact with dog wounds. An increased tendency of destruction was perceived during the studied period; 3) Histological changes of frog skin, characterized by tissue infiltration mainly from mononuclear cells, and by destruction of Malpighi and subjacent layers, were observed at the surface, limited to the wound contact area; 4) PPMNC values attained were not statistically different between groups. In the Test Group PM prevailed and PLI was exclusively seen. Conclusion: Frog skin is ineffective in treatment of canine cutaneous wounds and rejection was suggested as a causative factor.