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J.S. Nielsen, R. Pearson, E. Kopitas, A. Khanna, J.I. Perlman; Randomized Comparison of Concentrix and Venturi Vacuum Pump Systems Used for Phacoemulsification Cataract Extraction . Invest. Ophthalmol. Vis. Sci. 2005;46(13):762.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: Vacuum pump technology is a fundamental component of phacoemulsification cataract extraction and may be a significant variable in surgical complications. Our aim is to compare the differences including incidence and type of complications experienced during cataract surgery between the VenturiTM and ConcentrixTM, two commonly used vacuum pump systems. Methods: Both the ConcentrixTM and VenturiTM vacuum systems were studied using the MillenniumTM phacoemulsification unit. Patients undergoing routine cataract extraction at Edward Hines, Jr. VA Hospital were randomized to one of the two pumps. Preoperative cataract grading, intraoperative phacoemulsification parameters, and post–operative data were collected. Surgeon specific data was collected. Results: 107 patients underwent cataract extraction, 55 with the ConcentrixTM, and 52 with the VenturiTM. Both randomized populations are statistically similar with regard to nuclear density and surgeon experience. Average ultrasound was 29.05±8.95% for the ConcentrixTM and 27.77±6.97% for the VenturiTM. Ultrasound elapse time (min:sec) was 2:27±1:15 for the ConcentrixTM and 2:29±0:57 for the VenturiTM. Absolute ultrasound (min:sec) was 0:43±0:29 for the ConcentrixTM and 0:44±0:20 for the VenturiTM. Mean case time (min:sec) was 53:48±23:13 for the ConcentrixTM and 54:26±20:57 for the VenturiTM. The differences between all intraoperative parameters were not statistically significant. There were 7 intraoperative complications during the study where the vacuum pump may have been a factor, 5 with the ConcentrixTM and 2 with the VenturiTM. Chi–square analysis demonstrated this to be not statistically different. Conclusions: This study indicates that both pumps appear to be equally effective during cataract phacoemulsification. While the ConcentrixTM pump showed a trend toward more posterior capsular tear than with the VenturiTM system, this was not shown to be statistically significant. Both pumps appear to have a similar complication rate and appear to be equally safe.
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