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Master thesis . 2022
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Biocompatibilidade e tolerância do inserto oftálmico InEye em coelhos

Authors: Santos, Gonçalo Nuno Spínola;

Biocompatibilidade e tolerância do inserto oftálmico InEye em coelhos

Abstract

BIOCOMPATIBILIDADE E TOLERÂNCIA DO INSERTO OFTÁLMICO INEYE® EM COELHOS - Atualmente, mais de 90% de todas as preparações oftálmicas são administradas sob a forma de colírios. No entanto, apesar de ser uma forma de administração geralmente não invasiva, segura, barata e de fácil utilização, apresenta várias desvantagens. Recentemente foi desenvolvido um inserto oftálmico denomidado InEye®, por um grupo de investigadores da Universidade de Coimbra, para tentar ultrapassar essas dificuldades, com o intuito de ser utilizado tanto no Homem como em animais de companhia. O presente estudo teve por objetivos avaliar a biocompatibilidade e a tolerância do inserto InEye® in vivo em coelhos. Foram utilizados seis coelhos machos, brancos, da raça Nova Zelândia, com exames oftalmológicos normais. Os testes foram realizados num dos olhos de cada coelho durante uma semana, sendo utilizado o olho contralateral como controlo. Foi respeitado um intervalo mínimo duma semana entre ensaios. O inserto foi colocado no saco conjuntival inferior e foram realizados exames oftalmológicos às 6 h, 24 h e diariamente até aos 7 dias após a sua colocação, para verificar a sua permanência e reconhecer quaisquer sinais de desconforto ou inflamação. No total, foram testados 52 insertos, metade esfericos (n=26) e metade hemisféricos (n=26). A massa e o diâmetro equatorial dos insertos variaram de acordo com 11 categorias. Não se observaram lesões oculares, exceto um caso de leve hiperémia conjuntival autolimitante relacionada com um inserto esférico grande, logo a tolerância observada foi elevada. Do total de insertos, 19,2% permaneceram no saco conjuntival dos coelhos durante os 7 dias do ensaio. A variação da massa e do diâmetro equatorial teve implicações na sua biofuncionalidade. Os insertos que, em média, permaneceram mais tempo no saco conjuntival foram os insertos com 15 mg de massa (96 horas) e com 3 mm de diâmetro equatorial (108 horas). Não foi possível comprovar que o formato geral dos insertos e a sua pré-hidratação influenciavam a sua biofuncionalidade. Concluímos que a presença do InEye® foi bem tolerada pelos coelhos. Relativamente à sua biofuncionalidade são necessários mais estudos com formatos e tamanhos adicionais, adaptando o formato do inserto às características anatómicas e comportamentais das espécies alvo.

ABSTRACT - BIOCOMPATIBILITY AND TOLERANCE OF THE INEYE® OPHTHALMIC INSERT IN RABBITS - At present, more than 90% of all ophthalmic preparations are delivered as eye drops. However, despite being a generally non-invasive, safe, inexpensive and easy-to-use route of administration, it has several disadvantages. A recently developed ophthalmic insert named InEye® tries to address those difficulties. It is intended to be used both in humans and in companion animals. The present study aimed to evaluate both biocompatibility and tolerance of the InEye® insert in vivo in rabbits. Six male, New Zealand white rabbits, with normal ophthalmological exams, were used. Experiments were conducted in one eye of each rabbit for a week, the contralateral eye serving as control. An interval of at least one week was respected between trials. The insert was placed in the lower conjunctival sac and ophthalmic examinations were performed at 6 h, 24 h and daily until 7 days after placement to check for patency and recognize any signs of discomfort or inflammation. A total of 52 inserts were tested, half of them being spheres (n=26) and half hemispheres (n=26). The mass and equatorial diameter of the inserts varied according to 11 categories. There were no ocular sequelae except for one case of self-limiting slight conjunctival hyperemia in a large spherical insert case. From the total of inserts, 19.2% stayed in the conjunctival sac of the rabbits for at least 7 days. Both mass and equatorial diameter variation had implications on the biofunctionality. The inserts that, on average, remained in the conjunctival sac for the longest time were the inserts with a mass of 15 mg (96 hours) and those with an equatorial diameter of 3 mm (108 hours). It was not possible to prove that the general shape of the inserts and its pre-hydration had influence in their biofunctionality. We conclude that the presence of InEye® was well tolerated by the rabbits. On what concerns biofunctionality, it varied, being largely dependent on the anatomical characteristics and behaviour of the patient, so further studies are needed with additional shapes and sizes according to the target species.

Dissertação de Mestrado Integrado em Medicina Veterinária, área científica Clínica

N/A

Country
Portugal
Keywords

Ophthalmology, Oftalmologia, Coelho, Biocompatibilidade, Biocompatibility, Rabbit, Insert, Inserto

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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