Comparison of Two Different Ultrasound Methods of Phacoemulsification
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PURPOSE: To compare the safety and efficacy of micro-coaxial phacoemulsification surgeries performed with the OZil Intelligent Phaco torsional mode (Alcon Laboratories, Inc., Fort Worth, USA) and combined torsional/longitudinal ultrasound mode using 45 degree aperture angled tips. DESIGN: Prospective randomized clinical trial. METHODS: SETTING: Maltepe University, Istanbul. PATIENT POPULATION: Eighty eyes of 80 cataract patients were randomly assigned to 2.2 mm microcowdal phacoemulsification using the OZil Intelligent Phaco torsional mode (Group 1) or combined torsional/longitudinal ultrasound mode (Group 2). OBSERVATION PROCEDURE: Intraoperative fluid and energy usage and postoperative examinations were evaluated. MAIN OUTCOME MEASURES: Ultrasound time, cumulative dissipated energy, longitudinal and torsional ultrasound amplitudes, mean operation time, mean volume of fluid used, and surgical complications. RESULTS: Both groups included 40 eyes. Mean ultrasound time, cumulative dissipated energy, and longitudinal and torsional ultrasound amplitudes in Group 1 were 58.21 +/- 33.81 seconds, 7.74 +/- 6.23, 0.45 +/- 0.30, and 26.30 +/- 12.60%, respectively, and these parameters in Group 2 were 64.75 +/- 30.23 seconds, 12.61 +/- 6.21, 26.32 +/- 5.85, and 40.98 +/- 8.33%, respectively. Cumulative dissipated energy and longitudinal and torsional amplitudes were found to be significantly lower in Group 1 (P = .001, P < .001, P < .001). Mean volumes of fluid used in Groups 1 and 2 were 73.30 +/- 19.87 cc and 107.07 +/- 21.82 cc, respectively (P < .001). CONCLUSION: With the aid of a 45 degree aperture angled tip, the OZil Intelligent Phaco torsional mode provided more effective lens removal than the combined torsional/longitudinal ultrasound mode, with a lower cumulative dissipated energy and volume of fluid used. (C) 2014 by Elsevier Inc. All rights reserved.