Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Randomized Controlled Trial
. 2009 Oct;35(10):1719-24.
doi: 10.1016/j.jcrs.2009.04.047.

Comparison of torsional and longitudinal modes using phacoemulsification parameters

Marek Rekas  1 , Robert Montés-Micó, Karolina Krix-Jachym, Adam Kluś, Andrzej Stankiewicz, Teresa Ferrer-Blasco
Affiliations
Randomized Controlled Trial

Comparison of torsional and longitudinal modes using phacoemulsification parameters

Marek Rekas et al. J Cataract Refract Surg. 2009 Oct.

Abstract

Purpose: To compare phacoemulsification parameters of torsional and longitudinal ultrasound modes.

Setting: Ophthalmology Department, Military Health Service Institute, Warsaw, Poland.

Methods: This prospective study evaluated eyes 1, 7, and 30 days after phacoemulsification with an Infiniti Vision System using the torsional or longitudinal ultrasound (US) mode. Cataract classification was according to the Lens Opacities Classification System II. Nucleus fragmentation was by the phaco-chop and quick-chop methods. Primary outcome measures were phaco time, mean phaco power, mean torsional amplitude, and aspiration time. Total energy, defined as cumulative dissipated energy (CDE) x aspiration time, and the effective coefficient, defined as aspiration time/phaco time, were also calculated.

Results: Four hundred eyes were evaluated. The CDE was statistically significantly lower in the torsional mode for nucleus grades I, II, and III (P<.001) but not for grade IV (P>.05). Aspiration time was statistically significantly shorter in the torsional mode than in the longitudinal mode for nucleus grades III and IV (P<.05). Total energy was significantly lower in the torsional mode for all nucleus densities (P<.05). The effective coefficient was significantly lower in the longitudinal mode except for nucleus grade I (P<.05).

Conclusions: Torsional phacoemulsification was more effective than longitudinal phacoemulsification in the amount of applied fluid and the quantity of US energy expended. With the torsional method, it was possible to maintain a constant ratio of amount of fluid flow to quantity of US energy used, regardless of nucleus density.

PubMed Disclaimer

Publication types