| Bead-flow pattern: quantitation of fluid movement during torsional and longitudinal phacoemulsification. | |
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MedLine Citation:
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PMID: 20494776 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To develop a bead-flow pattern for visualizing and comparatively quantifying fluid movement using a torsional or longitudinal ultrasound (US) phaco handpiece. SETTING: Magill Laser Center, Medical University of South Carolina, Charleston, South Carolina, USA. METHODS: Visualization and quantification of intraocular fluid dynamics were evaluated by injecting neutrally buoyant, collagen-coated polystyrene beads (diameter, 125 to 212 microm) into the phacoemulsification irrigation flow. Using the anterior chamber of a cadaver or porcine eye or a laboratory test chamber, the bead-flow pattern was video recorded. Qualitative comparisons between longitudinal and torsional phacoemulsification were made using video-processing software to track the beads frame by frame. The time (quantitative) required to aspirate a bolus of beads from the anterior chamber (clearance time) was measured and compared between the 2 modalities. Aspiration efficiency was calculated to compare operating conditions in a test chamber using high-speed videography; conditions included irrigation/aspiration (I/A) only (0% power) and clinically relevant fluidic parameters and power modulations with torsional, longitudinal, or a combination of powers applied. RESULTS: Qualitative and quantitative analyses of the fluidic patterns of bead flow in the peripheral anterior chamber and near the aspirating tip opening indicated that torsional fluidics behave closer to the I/A-only configuration than longitudinal phacoemulsification, with the latter repelling more bead material in front of the aspiration tip. Bead clearance time was approximately 50% faster with torsional than with longitudinal US, regardless of the power setting. CONCLUSION: Bead flow-pattern evaluation is a feasible approach to future studies of fluid movement in the anterior chamber. |
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Authors:
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Luis E Fernández de Castro; Ramon C Dimalanta; Kerry D Solomon |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of cataract and refractive surgery Volume: 36 ISSN: 1873-4502 ISO Abbreviation: J Cataract Refract Surg Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-05-24 Completed Date: 2010-07-29 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8604171 Medline TA: J Cataract Refract Surg Country: United States |
Other Details:
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Languages: eng Pagination: 1018-23 Citation Subset: IM |
Copyright Information:
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(c) 2010 ASCRS and ESCRS. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Magill Research Center for Vision Correction, Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina 29425, USA. decastro@musc.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Anterior Chamber / metabolism* Coated Materials, Biocompatible Humans Microspheres* Ophthalmic Solutions / metabolism* Phacoemulsification / methods* Suction Swine Torsion, Mechanical Video Recording |
| Grant Support | |
ID/Acronym/Agency:
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EY-014793/EY/NEI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Coated Materials, Biocompatible; 0/Ophthalmic Solutions |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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