Nanoskin: uso para reposição de volume na cavidade anoftálmica / Use of Nanoskin for volume replacement of the eye socket

RESUMO Objetivo: Avaliar a biocompatibilidade da Nanoskin para reposição de volume em cavidades enucleadas ou evisceradas de coelhos. Métodos: Estudo experimental, utilizando implantes de Nanoskin (Innovatecs®, São Carlos, Brasil), celulose bacteriana produzida pela bactéria Acetobacter xylinum tendo como substrato o chá-verde. Implantes de 10mm de diâmetro/5mm de espessura foram colocados em cavidades enucleadas (G1) ou evisceradas (G2) de 21 coelhos, avaliados clinicamente todos os dias, sacrificados aos 7, 30 e 90 dias após a cirurgia. O material foi removido e preparado para exame de microscopia óptica. Resultados: Sinais flogísticos discretos no pósoperatório imediato, não tendo sido evidenciados sinais infecciosos ou extrusão de nenhum implante. Houve aparente redução do volume ao longo do período experimental. Histologicamente ambos os grupos foram muito semelhantes, apresentando aos 7 dias células inflamatórias (predominantemente monócitos e neutrófilos), rede de fibrina e hemácias. A Nanoskin apresentava-se como pequenas esferas, de cor rósea, com pequenos espaços entre elas, permeados por escassas células inflamatórias. As células inflamatórias se modificaram ao longo de período experimental, sendo possível observar aos 30 dias células gigantes multinucleadas e fibroblastos maduros permeando o implante. Aos 90 dias, a estrutura do implante apresentava-se desorganizada, amorfa, com restos necróticos e com áreas ovoides, revestidas por fina membrana rósea, que pareciam se agrupar, vazias ou preenchidas por material acelular, róseo ou acinzentado. Conclusão: A Nanoskin provocou reação inflamatória que levou à reabsorção e redução do volume do implante. Novas formulações devem ser estudadas a fim de ter um produto que seja permanente para reparo da cavidade anoftálmica.

ABSTRACT Objective: The aim of this study was to evaluate the biocompatibility of Nanoskin for replacing volume in enucleated or eviscerated anophthalmic sockets of rabbits. Methods: An experimental study was carried out using enucleated or eviscerated rabbits, which received Nanoskin implants (Innovatecs®, São Carlos, Brazil), a cellulose produced by a bacteria (Acetobacter xylinum) using green tea as substrate. Implants of 10mm diameter/5mm of thickness were used placed in enucleated (G1) or eviscerated (G2) anophthalmic sockets of 21 rabbits.They were clinically examined daily, sacrificed at 7, 30 and 90 days after surgery and the material was removed and prepared for histological examination. Results: There were discrete signs of inflammation in the immediate postoperative period, with no evidence of infection or extrusion in any animal. However apparent reduction of volume during the trial period occurred. Histologically both groups were similar, with inflammatory cells (mainly monocytes and neutrophils), fibrin and hemaceas at 7 days postoperatively.The Nanoskin was presented as small pink spheres, with small gaps between them and permeated by few inflammatory cells. These cells have changed over the study, at 30 days multinucleated giant cells and mature fibroblasts that permeate the implant were observed. At 90 days, the structure of the implant was disorganized, amorphous, with necrotic debris and ovoid areas covered with thin pink membrane that seemed to cluster, empty or filled with no cellular pink or gray material. Conclusion: Nanoskin caused an inflammatory reaction leading to reabsorption and reduction of implant volume. New formulations should be studied in order to have a permanent product to repair the anophthalmic socket.

Cavidades anoftálmicas atípicas en el Instituto Cubano de Oftalmología "Ramón Pando Ferrer" / Atypical anophthalmic cavities observed in patients seen at "Ramón Pando Ferrer" Cuban Institute of Ophthalmology

OBJETIVO: describir el comportamiento de las cavidades anoftàlmicas atípicas. MÉTODOS: se realizó un estudio descriptivo prospectivo en pacientes con cavidades anoftálmicas atípicas atendidos en la consulta de Cirugía Plástica Ocular, en el período de enero de 2009 a julio de 2010. Se analizaron diferentes variables como sexo, edad, alteraciones de la cavidad y tratamiento quirúrgico. RESULTADOS: del total de los pacientes vistos en la consulta, 57 % pertenecían al sexo masculino. El 43 % se encontraba entre los 30 y 49 años. El 90,2 % presentó alteraciones conjuntivales, y la de mayor representatividad fue la retracción del fornix inferior, con el 33,8 %. Dentro de las técnicas quirúrgicas, la reinserción conjuntival del fondo de saco fue la más utilizada y se realizó en el 38 % de los pacientes. CONCLUSIONES: el mayor número de pacientes vistos pertenecen al sexo masculino y al grupo de edades entre 30 y 49 años. Predominaron las alteraciones conjuntivales y dentro de ellas la retracción del fornix inferior. La técnica más utilizada fue la reinserción de la conjuntiva.

OBJECTIVE: to describe the behavior of atypical anophthalmic cavities. METHODS: aprospective and descriptive study was conducted in patients with atypical anophthalmic cavities seen in the ocular plastic surgery service from January 2009 to July 2010. The analyzed variables were sex, age, cavity abnormalities, and surgical treatment. RESULTS: of all patients seen, 57 % were males and 43 % were 30 to 49 years-old. In this group, 90,2 % had conjunctival anomalies, being the inferior fornix retraction the most significant with 33.8 %. Among the surgical techniques used, the conjunctival reinsertion of the fornix was the most performed in 38% of cases. CONCLUSIONS: the highest number of patients was males and the predominant age group was 30-49 years; conjunctival alterations were predominant, mainly the inferior fornix retraction. The most used technique was the reintegration of the conjunctiva.

Congenital anophthalmia: a review of dealing with volume

Anophthalmia in childhood whether congenital or acquired is not just a question of cosmesis. Loss of an eye can effect the maturation of the soft tissues and bony structure surrounding the affected orbit. Therefore, a comprehensive approach including medical and surgical interventions is required to rehabilitate a child early in life. A literature survey of the past 40 years on the topic of congenital anophthalmia with focus on medical and surgical volume augmentation of the orbit was conducted. Newer technologies including hydrogel implants and saline-filled tissue expanders have allowed for more rapid expansion of the pediatric orbit often with minimally invasive surgical procedures. However, traditional approaches including conformer therapy are still the primary intervention in these complicated cases. Anophthalmia in childhood requires a close interaction between ophthalmologist and ocularist as well as a motivated patient and family. With early intervention a good cosmetic outcome with periocular symmetry is obtainable

Repair of the anophthalmic cavity of rats with synthetic hydroxyapatite

We placed spheres of synthetic hydroxyapatite (calcium chloride combined with sodium phosphate) in the eviscerated or enucleated orbital cavity of rats in order to evaluate the biocompatibility of this material with the orbital cavity. The study was conducted on 50 albino rats, 25 of which were submitted to enucleation and 25 to evisceration of one eye. The animals were sacrificed 7, 15, 21, 30 and 60 days after surgery and the orbital content was submitted to histopathological examination. A reaction of the young granulation tissue type was observed first. The hydroxyapatite was gradually surrounded by a granulomatous macrophage inflammatory response and covered with dense connective tissue that formed a sort of "mesh" septating and supporting progressively smaller blocks of the substance. The same type of reaction was observed in the enucleated and eviscerated cavities. We conclude that synthetic hydroxyapatite is an inert nonallergenic material which is appropriate for volume replacement in the anophthalmic cavity.

Tratamento das deformidades órbito-palpebrais das cavidades anoftálmicas: 20 anos de experiência / Anophthalmic cavity deformities prevention: 20 years' experience

O autor relata sua experiência (1968-1988) a respeito da prevençäo dos defeitos inestéticos e deformidades observadas nas cabidades anoftálmicas. levando em consideraçäo o que é considerado um resultado quase perfeito (cavidade com um olho inestético coberto por uma lente escleral pintada), as evisceraçöes e enucleaçöes säo realizadas substituindo o volume orbitário perdido com um implante primário, a fim de obter os mesmos resultados. Observados durante um longo follow-up, os pacientes näo apresentaram nenhuma das deformidades relacionadas, especialmente a retraçäo da cavidade. O autor usa o implante esférico coberto pela esclera preservada, completamente sepultado na cápsula de Tenon e fixado aos 4 músculos retos. Estes implantes fornecem uma substituiçäo de volume adequada, principalmente quando a túnica escleral inclui a córnea. A preservaçäo da córnea - quando possível - é provavelmente uma contribuiçäo original. Uma grande satisfaçäo é obtida por causa dos resultados cosméticos excelentes, conseguidos às custas da reconstruçäo das relaçöes normais que devem existir entre as diversas estruturas orbitárias e sobretudo da manutençäo das suas funçöes. Os resultados estudados e observados durante estes 20 anos têm provado que esta técnica preenche seus propósitos em mais de 93% dos casos