Acurácia da medida da inserção dos músculos retos com tomografia de coerência óptica em adultos submetidos a cirurgias de estrabismo

• Autor(a) principal: Rossetto, Julia Dutra [UNIFESP]
• Data de Publicação: 2017
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=5060940; http://repositorio.unifesp.br/handle/11600/50513
• topic: Optical coherence tomography; Strabismus; Oculomotor muscles; Limbus of cornea; Tomografia de coerência óptica; Estrabismo; Músculos oculomotores; Limbo da córnea

Purpose: To assess the accuracy of anterior segment optical coherence tomography (AS-OCT) in measuring the distance of extraocular muscle (EOM) insertion to the limbus to improve preoperative assessment of adult patients undergoing strabismus surgery. Methods: A reliability analysis at an institutional practice performed in adult patients scheduled for strabismus surgery on rectus muscles. The distance between the EOM insertion and the limbus was measured preoperatively with AS-OCT. The value was compared to intraoperative measurement obtained with calipers. Additional measurements included the limbus-anterior chamber angle distance with AS-OCT and the axial length with IOLMaster. The main outcome measure was the greement between preoperative AS-OCT and intraoperative measurements. A difference of ≤ 1 millimeter (mm) was "clinically acceptable". Results: 144 muscles were analyzed from 74 patients. 31 of 33 reoperated muscles were successfully imaged. AS-OCT measurements were within 1 mm of intraoperative measurements in 77% of all the muscles. The accuracy was higher for muscles with no prior surgery (83%), as compared to re-operated muscles (58%). Although the accuracy decreased when comparing reoperations to primary surgeries for the medial (79 to 63%; p=0.09; 95%CI, -1.38 to 0.11) and the lateral rectus (81 to 49%; p=0.11; 95%CI, -2.06 to 0.22), the difference was not significant. No correlation between limbus-anterior chamber angle distance and axial length was established. Conclusions: AS-OCT is valuable in identifying EOM insertions in primary strabismus surgeries, but the accuracy decreases in re-operations. The intraoperative measure performed before the detachment of the muscle's tendon and the use of limbus as a reference point in the OCT proved to be suitable for performing the measurements.