Torsional ultrasound modality for hard nucleus phacoemulsification cataract extraction
Open Access
- 20 June 2008
- journal article
- research article
- Published by BMJ in British Journal of Ophthalmology
- Vol. 92 (8), 1092-1096
- https://doi.org/10.1136/bjo.2007.128504
Abstract
Aim: To evaluate the efficacy and safety of phacoemulsification using torsional modality with different parameter settings for hard nucleus cataract extraction. Design: A prospective, randomised clinical study. Methods: A clinical practice study conducted at the Cataract Service, Zhongshan Ophthalmic Center, Sun-Yat-Sen University, and Guangzhou. One eye each from 198 consecutive patients with cataract density grade IV according to the Emery–Little system classification system, requiring phacoemulsification and intraocular lens implantation, was included. Eyes were randomly assigned to the Linear Torsional combined with Ultrasound power group (Linear Tor+US group, n = 66), 100% Fixed Torsional group (Fixed Tor group, n = 65) and conventional Ultrasound burst group (US group, n = 67). All surgeries were performed by a single experienced surgeon and outcomes evaluated by another surgeon masked to treatment. Intraoperative parameters were Ultrasound Time (UST), Cumulative Dissipated Energy (CDE) and surgical complications. Patients were examined on post-op days 1, 7 and 30. Postoperative outcomes were final best corrected visual acuity (BCVA), average central and incisional corneal thickness and central endothelial cell counts. Results: The mean UST was lower in the Fixed Tor group than in the US group and in the Lin US+Tor group (p⩽0.0001). The mean CDE was lower in the Lin Tor+US group and in the Fixed Tor group than in the US group (p⩽0.0001). Comparing with the two Tor group, the US group had a lower average BCVA on post-op 1, 7 (p⩽0.0001) and 30 (p>0.01), greater average central corneal and incisional thickness on days 1, 7 (p⩽0.0001) and 30 (p>0.01), and higher average corneal endothelial cell losses on day 7 and 30 days (p⩽0.0001). Conclusions: Torsional combined with ultrasound power or high fixed torsional amplitude can yield more effective hard nucleus phacoemulsification than conventional ultrasound modality.Keywords
This publication has 24 references indexed in Scilit:
- Innovations in phacoemulsification technologyCurrent Opinion in Opthalmology, 2007
- Fluidics and Heat Generation of Alcon Infiniti and Legacy, Bausch & Lomb Millennium, and Advanced Medical Optics Sovereign Phacoemulsification SystemsAmerican Journal of Ophthalmology, 2006
- Refractive lens exchange combined with pars plana vitrectomy to correct high myopiaEye, 2006
- Refractive lens exchange combined with pars plana vitrectomy to correct high myopiaEye, 2006
- Refractive lens exchange in high myopia: long term follow upBritish Journal of Ophthalmology, 2005
- Corneal Endothelium Evaluation After Phacoemulsification With Continuous Anterior Chamber InfusionCornea, 2005
- Estudo comparativo da densidade de células endoteliais da córnea após facoemulsificação pelas técnicas de "dividir e conquistar" e "quick chop"Arquivos Brasileiros de Oftalmologia, 2005
- Phacoemulsification parametersJournal of Cataract & Refractive Surgery, 2004
- Phacoemulsification and thermal wound injurySeminars in Ophthalmology, 2002
- Corneal thickness and endothelial density before and after cataract surgeryBritish Journal of Ophthalmology, 2001