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Kerry Assil, William Christian, Lindsay Harris; Randomized Comparison of a Transversal Ultrasound vs. a Torsional Handpiece in Phacoemulsification: A Contralaterally-Controlled Trial. Invest. Ophthalmol. Vis. Sci. 2012;53(14):6635.
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To compare multiple outcome variables in eyes undergoing phacoemulsification using either a Transversal Ultrasound handpiece or a Torsional handpiece.
Prospective, open-label, interim analysis of a contralaterally-controlled single center evaluation of 52 eyes. Patients had one eye randomly assigned to one of two treatment groups, thereby undergoing phacoemulsification with either the WHITESTAR Signature® system using the ELLIPS® FX transversal ultrasound handpiece (FX) or the Infiniti system using the OZIL torsional handpiece (OZIL). The contralateral eye was treated with the alternate device.
Mean SE preoperatively was -0.16D. Mean phaco time was significantly lower with the FX system than with the OZIL system (45.7 sec vs. 80.54 sec, P=.034), respectively. Similarly, mean total balanced salt solution used was less with the FX: 313 cc vs. the OZIL: 350.9 cc, (P=.04). The amount of power required was also significantly lower for the FX: 45.2 mJ vs. OZIL: 67.1 mJ (P=.023). The amount of time required to seal the wound was also slightly lower with the FX: 15.4 sec vs. the OZIL: 16.1 sec, (P>0.05). There was no difference in incision size or amount of BSS required to seal the wounds. UCVA was slightly better in the FX eyes at Day 1 (LogMAR 0.15 vs. 0.23, P>.05), and there were no significant differences at any other timepoint. Five patients had corneal edema at Day 1 with the FX handpiece and 10 patients with the OZIL handpiece. The FX group had slightly higher endothelial cell counts when compared to OZIL (FX: 2248 vs. OZIL: 2151 at Week 1, FX: 2324 vs. OZIL: 2082 at Month 1; all P>0.05).
The WHITESTAR Signature® system using the ELLIPS® FX transversal ultrasound handpiece allowed for a faster procedure with less BSS required, less phaco time, and less power than the Infiniti system using the OZIL torsional handpiece.
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