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Comparison of torsional mode and conventional ultrasound mode phacoemulisification for cataract surgery Ji Jing, Luo Min, Fan Xianqun, Liu Haiyan Shanghai 9th hospital ophthalmology department, Shanghai Jiaotong University Objective To compare the intraoperative and postoperative outcomes of cataract surgery performed with torsional mode and conventional ultrasound mode using the Infiniti Vision System. Methods Randomized comparative study.188 eyes were assigned to phacoemulisification by torsional mode or conventional ultrasound mode according to the appointed day. The surgery was performed by an experienced surgeon, and the outcomes were evaluated by an examiner who was masked to treatment assignments. Primary outcome measures were US time(UST),cumulative dissipated energy(CDE),and surgical complication. Patients were seen 7,30,and 90 days after surgery. Postoperative outcome measures were the final best corrected visual acuity(BCVA)and the change in endothelial cell count. Results The US group had 94 eyes and torsional group 94 eyes. All patients completed the follow–up visits. In the eyes with nucleus density grades of I+II,III,IV and above, the mean UST was 31.06±14.29s,35.72±19.74s,74.11±41.50s,respectively in the torsional group and 47.3±17.58s,53.34±19.51s,84.54±15.45s respectively in the US group(P<0.05);the mean CDE was11.2±5.33,12.42±5.49,18.19±1.31 respectively in the torsional group and 12.65±5.71,15.64±9.35,42.5±3.01 respectively in the US group(P<0.05).Postoperative 90 days, the mean BCVA were 0.72±0.21 in torsional group and 0.70±0.18 in US group(P>0.05). At 7 days,30 days and 90 days, the mean central corneal endothelial cell count was 2149±199, 2222±177, 2313±161 respectively in the torsional group and 2055±218,2084±175, 2259±179 respectively in the US group(P<0.05). Conclusion The torsional mode can provide more effective lens removal with a lower level of phacoemulsification time and energy. [KEY WORD] cataract, phacoemulisification, torsional mode |
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