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Title: Novel method to quantify traction in a vitrectomy procedure
Authors: Teixeira, Anderson [UNIFESP]
Chong, Lawrence
Matsuoka, Naoki
Rowley, Adrian
Lue, Jaw-Chyng
McCormick, Matthew
Kerns, Ralph
Humayun, Mark
Doheny Eye Inst
Eye Concepts
VMR Inst
Doheny Retina Inst
Universidade Federal de São Paulo (UNIFESP)
Niigata Univ
Univ So Calif
Issue Date: 1-Sep-2010
Publisher: B M J Publishing Group
Citation: British Journal of Ophthalmology. London: B M J Publishing Group, v. 94, n. 9, p. 1226-1229, 2010.
Abstract: Aim To report a novel method to quantify traction applied to the retina using vitreous cutters during pars plana vitrectomy.Methods Fresh porcine eyes were positioned in a specially developed holder and transfixed to the retinal layers with a wire and the other end fixed to the load cell of a strain gauge. Five separate 20-gauge electrical drive mechanism vitrectors were introduced into the eye at a 45 degrees angle and positioned at a distance of either 3 or 5 mm from the retina. Data from the strain gauge were acquired and the traction force computed.Results the analysis revealed that the vitreoretinal traction increased by 7.90 dynes for each 100 mm Hg increase in vacuum (p<0.05). the traction forces decreased by 2.51 dynes for each 500 cuts per minute increased (p<0.05) and the traction force increased by 2.17 dynes at 3 mm compared with 5 mm (p<0.05).Conclusion the traction was directly proportional to the aspiration vacuum and inversely proportional to the cut rate. the cutter traction force increased with proximity to the retina.
ISSN: 0007-1161
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Appears in Collections:Em verificação - Geral

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