Torsional Ultrasound Modality for Hard Nucleus Phacoemulsification Cataract Extraction

Overview

Journal Br J Ophthalmol

Specialty Ophthalmology

Date 2008 Jun 24

PMID 18567650

Citations 20

Authors

M Zeng

X Liu

Y Xia

L Luo

Z Yuan

Y Zeng

Y Liu

Affiliations

Soon will be listed here.

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<or=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<or=0.0001). Comparing with the two Tor group, the US group had a lower average BCVA on post-op 1, 7 (p<or=0.0001) and 30 (p>0.01), greater average central corneal and incisional thickness on days 1, 7 (p<or=0.0001) and 30 (p>0.01), and higher average corneal endothelial cell losses on day 7 and 30 days (p<or=0.0001).

Conclusions: Torsional combined with ultrasound power or high fixed torsional amplitude can yield more effective hard nucleus phacoemulsification than conventional ultrasound modality.

Citing Articles

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Laminin α4 overexpression in the anterior lens capsule may contribute to the senescence of human lens epithelial cells in age-related cataract.

Yan Y, Yu H, Sun L, Liu H, Wang C, Wei X Aging (Albany NY). 2019; 11(9):2699-2723.

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Comparison of surgical parameters using different lens fragmentation patterns in eyes undergoing laser-assisted cataract surgery.

Uy H, Chan P, Gil-Cazorla R, Shah S Int Ophthalmol. 2019; 39(11):2459-2465.

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Comparison of clinical outcomes between cystotome-assisted prechop phacoemulsification surgery and conventional phacoemulsification surgery for hard nucleus cataracts: A CONSORT-compliant article.

Li X, He Y, Su T, Tian Y, Wang Y, Xia X Medicine (Baltimore). 2018; 97(46):e13124.

PMID: 30431580 PMC: 6257572. DOI: 10.1097/MD.0000000000013124.

Corneal endothelial morphology and function after torsional and longitudinal ultrasound mode phacoemulsification.

Modis L, Szalai E, Flasko Z, Nemeth G Rom J Ophthalmol. 2018; 60(2):109-115.

PMID: 29450332 PMC: 5711360.

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