ABSTRACT
PURPOSE: This study aims to evaluate the influence of preoperative phenylephrine testing on the surgical outcome of patients undergoing surgery for involutional ptosis by external levator advancement. METHODS: This was an observational, monocentric, retrospective study. Fifty-one eyelids from 32 patients, who had surgery between January 2018 and May 2023, were included for analysis. Preoperative clinical examination data were collected. Evaluation was performed at 1 month postoperatively. Surgical success was defined by a postoperative margin reflex distance between 3 and 5 mm inclusive. Symmetry success was defined by a difference in margin reflex distance between the 2 upper eyelids of no more than 1 mm. RESULTS: The surgical success rate was 86%. A positive preoperative phenylephrine test was significantly associated with a better surgical success rate (p = 0.01), including on symmetry (p = 0.01). The secondary outcomes, namely preoperative margin reflex distance, function of the upper eyelid levator muscle, and unilaterality of surgery, were not statistically associated with surgical outcome. CONCLUSIONS: The phenylephrine test is a predictive factor of surgical success in patients undergoing external levator advancement. Our study suggests that patients with a negative phenylephrine test should be overcorrected intraoperatively.
ABSTRACT
PURPOSE: The purpose of the study was to suggest a new method to calculate the intraocular lens (IOL) power in paediatric cataracts targeting emmetropia at the age of 15 years. METHODS: Data of children younger than 15 years who underwent cataract surgery with IOL implantation between 2005 and 2020 in the ophthalmological department of Marseille (South of France) was collected retrospectively. A logarithmic regression model was used to predict the axial length growth of the included eyes between implantation and 15 years. The predicted myopic shift served as target refraction to calculate a theoretical IOL power aiming for emmetropia at 15 years. Refractive error with the theoretical lens power was estimated as the spherical equivalent at the last follow-up minus the difference of target refractions between the implanted IOL and the theoretical one. Refractive errors using Dahan, Enyedi and Trivedi guidelines were also estimated and compared to the logarithmic model. RESULTS: Thirty-five eyes of 26 children were analysed. At the last follow-up, the median age of children was 10 years old and the median spherical equivalent was -1.88 dioptres (D) (IQR -3.81, -0.75). The estimated median refractive errors were 0.18 D (IQR -1.11, 1.42) with the logarithmic formula, -1.47 D (IQR -3.84, -0.65) with Dahan formula, -0.63 D (IQR -2.15, 0.32) with Enyedi formula and 0.38 D (IQR -1.58, 1.07) with Trivedi formula. CONCLUSION: The estimated refractive error with the new logarithmic formula is the closest to emmetropia at the last follow-up.
ABSTRACT
PURPOSE: The aim of this study was to show the displacements and strain induced by the supraorbital band advancement during a craniofacial surgery for an anterior plagiocephaly on the orbital bones and the orbital content thanks to a numerical surgical simulation using the finite element method. METHODS: A three-dimensional (3D) finite element model of a child with an anterior plagiocephaly was entirely created from a tomodensitometry of a patient followed by our Craniofacial Pediatric team. Data of the tomodensitometry were computed with Slicer 3D to re-create the orbit geometry. Mesh production, properties of the model, and simulations of the fronto-orbital advancement were conducted on Hyperworks software (Altair Engineering, Inc., Detroit, MI, USA). RESULTS: The resulting 3D Finite Element Model was used to perform the supraorbital advancement simulation. Displacement and strain patterns were studied for orbital bones, oculomotor muscles, and eyeballs. Relative high strain in the both trochlear area and excycloration of the right orbit are among the most interesting results as torsional strabismus as V-pattern strabismus are often described in children with an anterior plagiocephaly. CONCLUSIONS: This pediatric Finite-Element Model of both orbits of a child with an anterior plagiocephaly showed the impact of the fronto-orbital advancement on the oculomotor system. This model described the relationship between the craniofacial surgery and the strabismus in the unilateral coronal synostosis. The advantages of this model are the many opportunities for improvement, including postoperative period and additional surgical procedures.
