Jawchyng L Lue1, Ramiro Ribeiro2, Michael J Koss2, Paulo Falabella3, Rodrigo Brant4, Mark S Humayun5,6. 1. Department of Ophthalmology, Keck School of Medicine of the University of Southern California (USC), Los Angeles, CA, 90033, USA. echojlue@gmail.com. 2. Department of Ophthalmology, Keck School of Medicine USC, Los Angeles, CA, 90033, USA. 3. Department of Ophthalmology and Visual Sciences, Federal University of São Paulo, São Paulo, Brazil. 4. Ophtalmology Hospital, Federal University of São Paulo, São Paulo, Brazil. 5. USC Dr. Allen and Charlotte Ginsburg Institute for Biomedical Therapeutics, Los Angeles, CA, USA. 6. USC Roski Eye Institute at the University of Southern California (USC), Los Angeles, CA, 90033, USA.
Abstract
PURPOSE: Traction exerted on the vitreous base during vitrectomy poses a risk for retinal tears. We aimed to quantify core vitreous traction during vitrectomy using spring return and pneumatic cutters. METHODS: Juvenile porcine vitreous was vacuum held in a vitreous bath while traction was measured using precision force gauge during vitrectomy. The parameters included were aspiration rate, cut-rate, cutter size, and machine types. RESULTS: An empirical probabilistic model was developed. The traction was proportional to the aspiration rate but insignificantly dependent on the cut-rate. The traction probability was inversely proportional to the exponential function of the traction (p < 0.05). The traction was < 0.003 N for 99% of the time using either 23- or 25-gauge cutters. CONCLUSION: The tractions measured were considered similar to the causative forces of an iatrogenic retinal tear during a pars plana vitrectomy. The results provide a safety reference matrix of instrumental parameters during vitrectomy.
PURPOSE: Traction exerted on the vitreous base during vitrectomy poses a risk for retinal tears. We aimed to quantify core vitreous traction during vitrectomy using spring return and pneumatic cutters. METHODS: Juvenile porcine vitreous was vacuum held in a vitreous bath while traction was measured using precision force gauge during vitrectomy. The parameters included were aspiration rate, cut-rate, cutter size, and machine types. RESULTS: An empirical probabilistic model was developed. The traction was proportional to the aspiration rate but insignificantly dependent on the cut-rate. The traction probability was inversely proportional to the exponential function of the traction (p < 0.05). The traction was < 0.003 N for 99% of the time using either 23- or 25-gauge cutters. CONCLUSION: The tractions measured were considered similar to the causative forces of an iatrogenic retinal tear during a pars plana vitrectomy. The results provide a safety reference matrix of instrumental parameters during vitrectomy.
Authors: Anderson Teixeira; Lawrence Chong; Naoki Matsuoka; Adrian Rowley; Jaw-Chyng Lue; Matthew McCormick; Ralph Kerns; Mark Humayun Journal: Br J Ophthalmol Date: 2010-06-10 Impact factor: 4.638
Authors: Anderson Teixeira; Lawrence P Chong; Naoki Matsuoka; Luis Arana; Ralph Kerns; Prashant Bhadri; Mark Humayun Journal: Ophthalmology Date: 2010-02-21 Impact factor: 12.079