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  • article 3 Citação(ões) na Scopus
    Safety and cost-effectiveness of single-use endolaser probe reprocessing in vitreoretinal surgery
    (2021) ZACHARIAS, Leandro Cabral; CONCI, Livia da Silva; MEGNIS, Bianca Partezani; FALABRETTI, Janaina Guerra; RODRIGUES NETO, Taurino dos Santos; SILVA NETO, Epitacio Dias da; PRETI, Rony Carlos; CUNHA, Leonardo Proveti; MONTEIRO, Mario Luiz Ribeiro
    BackgroundEndolaser probes have been designed and sold for single-use only. However, in Brazil, they are not included in the list of single-use medical products that are prohibited from being reprocessed and could potentially be reused if safety requirements are accomplished. Therefore, this study aimed to determine and compare the quality, safety and costs of reprocessed versus original single-use endolaser probes of a specific brand and model.MethodsThe study, conducted at a university hospital in Sao Paulo, Brazil, was divided in two phases. The first one tested the feasibility, sterility and physical integrity of ten reprocessed laser probes. In the second phase, all vitrectomy procedures using endolaser probes (reprocessed and original ones) from August 2017 to October 2019 were evaluated. The operated cases were followed for any signs of infection and number of defective probes for each group were counted. The cost of acquiring a new probe and for all reprocessing stages were evaluated and quantified in US dollars($).ResultsMicrobiologic, residual ethilen oxide and microscopic evaluation of integrity of reprocessed laser probes were all within acceptable range. The second phase of this study included 590 endolaser probes, of which 375 were original and 215 were reprocessed. Functionality rates differed significantly between groups. Among the original probes, 373 (99.47%) were functioning and 2 (0.53%) were non-functioning. Among the reprocessed ones, 201 (93.5%) were functioning and 14 (6.5%) were non-functioning (p<.001). The average cost of one reprocessing was $3.00, and the average cost of an original probe was $150.00. Considering the loss rates, potential savings were $147.60 for each once-reprocessed probe. The frequency of infectious endophthalmitis was null in both groups.ConclusionsOur study showed that a single cycle endolaser probe reprocessing was safe and efficient, not associated with increase in endophthalmitis rate and proved to be significantly cost-effective, even considering a greater malfunction rate when compared to the original devices.
  • article 0 Citação(ões) na Scopus
    Normative data for macular perimetry using the MP-3 microperimeter in healthy individuals
    (2024) NETO, Taurino dos Santos Rodrigues; NETO, Epitacio Dias da Silva; HIGASHI, Alex Haruo; MEGNIS, Bianca Partezani; HADDAD, Maria Aparecida Onuki; MONTEIRO, Mario Luiz Ribeiro; ZACHARIAS, Leandro Cabral
    Purpose: Microperimetry has been used for several years as a form of visual function testing in patients with retinal diseases. Normal microperimetry values obtained with microperimeter MP-3 have not yet been fully published, and baseline values for topographic macular sensitivity and correlations with age and sex are needed to establish degrees of impairment. This study aimed to determine values for light sensitivity thresholds and fixation stability using the MP-3 in healthy individuals. Methods: Thirty-seven healthy volunteers (age, 28-68 years), underwent full-threshold microperimetry using a 4-2 (fast) staircase strategy with the standard Goldmann III stimulus size and 68 test points positioned identically to those in the Humphrey Field Analyzer 10-2 test grid. The fixation stability was simultaneously recorded during the microperimetry test. The relationship between global sensitivity and age was calculated using linear regression analysis. Results: Microperimetry was performed on 37 participants (74 eyes). The global mean sensitivity was 29.01 +/- 1.44 (range, 26-31) dB. The mean central sensitivity at 2 degrees measured by the MP-3 was 28.5 +/- 1.77 dB in the right eye (OD) and 28.75 +/- 1.98 dB in the left eye (OS). The total median fixation stability values within 2 degrees and 4 degrees were 80% and 96%, respectively. The linear regression analysis also revealed an age-related global sensitivity decline per year of -0.051 dB +/- 0.018 (OD) and -0.078 dB +/- 0.021 (OS). Conclusions: Microperimetry performed with the MP-3 allows for an automatic, accurate, and topography-specific examination of retinal sensitivity thresholds. The results of this study provide a normal and age-matched database of MP-3 microperimetry.