Fluid dynamics and intraocular pressure using venturi phacoemulsification machine in dogs ex vivo. (27th October 2014)

• Record Type: Journal Article
• Authors: Kang, Seonmi; Park, Sangwan; Noh, Hyunwoo; Seo, Kangmoon
• Is Part Of: Veterinary ophthalmology. Volume 18:Number 4(2015)
• Page Start: 309
• Page End: 316
• Publication Date: 2014-10-27
• Subjects: Veterinary ophthalmology -- Periodicals; 636.08977
• DOI: 10.1111/vop.12231
• Languages: English
• ISSNs: 1463-5216

Abstract

<abstract abstract-type="main" id="vop12231-abs-0001"> <title>Abstract</title> <sec id="vop12231-sec-0001" sec-type="section"> <title>Objective</title> <p>To optimize fluid dynamics through measuring intraocular pressure (IOP) in a venturi phacoemulsification machine in dogs.</p> </sec> <sec id="vop12231-sec-0002" sec-type="section"> <title>Procedures</title> <p>In step I, flow and IOP of the test chamber were measured using a pressure transducer with the bottle height (BH) set at 50, 70, 100, and 120 cm and the vacuum from 30 to 450 mmHg. A 19‐gauge phaco and a 0.3‐mm irrigation/aspiration (I/A) handpiece were used. In step II, flow and IOP were measured in an enucleated canine eye with a 3.0‐ and a 3.2‐mm clear corneal incision (CCI), respectively. IOP was measured using the pressure transducer at a 30‐mmHg vacuum to allow corneal deformation, to define the fluidic parameters for preventing surge.</p> </sec> <sec id="vop12231-sec-0003" sec-type="section"> <title>Results</title> <p>Flow was directly proportional to the BH and vacuum, whereas IOP was directly proportional to the BH and inversely to the vacuum. Flow with an I/A handpiece was significantly less than with a phaco handpiece, explaining why IOP with an I/A handpiece was significantly higher than with a phaco handpiece. With the I/A handpiece, vacuum parameters less than 450 mmHg did not result in corneal deformation. IOP with a 3.2‐mm CCI was significantly lower than with a 3.0‐mm CCI, with the 3.2‐mm flow being greater than the 3.0‐mm flow.</p> </sec> <sec id="vop12231-sec-0004" sec-type="section"> <title>Conclusions</title> <p> BH during the I/A stage could be reduced to avoid unnecessary stress on the canine eye when using a venturi system. Although phacoemulsification with a 3.2‐mm CCI could induce lower IOP, a 3.0‐mm CCI might lessen the irrigation flow stress on the eye.</p> </sec> </abstract>