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Change in Intraocular Pressure During Point-of-Care Ultrasound
INTRODUCTION: Point-of-care ocular ultrasound (US) is a valuable tool for the evaluation of traumatic ocular injuries. Conventionally, any maneuver that may increase intraocular pressure (IOP) is relatively contraindicated in the setting of globe rupture. Some authors have cautioned against the use...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Department of Emergency Medicine, University of California, Irvine School of Medicine
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4380377/ https://www.ncbi.nlm.nih.gov/pubmed/25834668 http://dx.doi.org/10.5811/westjem.2015.1.24150 |
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author | Berg, Cameron Doniger, Stephanie J. Zaia, Brita Williams, Sarah R. |
author_facet | Berg, Cameron Doniger, Stephanie J. Zaia, Brita Williams, Sarah R. |
author_sort | Berg, Cameron |
collection | PubMed |
description | INTRODUCTION: Point-of-care ocular ultrasound (US) is a valuable tool for the evaluation of traumatic ocular injuries. Conventionally, any maneuver that may increase intraocular pressure (IOP) is relatively contraindicated in the setting of globe rupture. Some authors have cautioned against the use of US in these scenarios because of a theoretical concern that an US examination may cause or exacerbate the extrusion of intraocular contents. This study set out to investigate whether ocular US affects IOP. The secondary objective was to validate the intraocular pressure measurements obtained with the Diaton® as compared with standard applanation techniques (the Tono-Pen®). METHODS: We enrolled a convenience sample of healthy adult volunteers. We obtained the baseline IOP for each patient by using a transpalpebral tonometer. Ocular US was then performed on each subject using a high-frequency linear array transducer, and a second IOP was obtained during the US examination. A third IOP measurement was obtained following the completion of the US examination. To validate transpalpebral measurement, a subset of subjects also underwent traditional transcorneal applanation tonometry prior to the US examination as a baseline measurement. In a subset of 10 patients, we obtained baseline pre-ultrasound IOP measurements with the Diaton® and Tono-Pen®, and then compared them. RESULTS: The study included 40 subjects. IOP values during ocular US examination were slightly greater than baseline (average +1.8mmHg, p=0.01). Post-US examination IOP values were not significantly different than baseline (average −0.15mmHg, p=0.42). In a subset of 10 subjects, IOP values were not significantly different between transpalpebral and transcorneal tonometry (average +0.03mmHg, p=0.07). CONCLUSION: In healthy volunteer subjects, point-of-care ocular US causes a small and transient increase in IOP. We also showed no difference between the Diaton® and Tono-Pen® methods of IOP measurement. Overall, the resulting change in IOP with US transducer placement is considerably less than the mean diurnal variation in healthy subjects, or pressure generated by physical examination, and is therefore unlikely to be clinically significant. However, it is important to take caution when performing ocular ultrasound, since it is unclear what the change in IOP would be in patients with ocular trauma. |
format | Online Article Text |
id | pubmed-4380377 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Department of Emergency Medicine, University of California, Irvine School of Medicine |
record_format | MEDLINE/PubMed |
spelling | pubmed-43803772015-04-01 Change in Intraocular Pressure During Point-of-Care Ultrasound Berg, Cameron Doniger, Stephanie J. Zaia, Brita Williams, Sarah R. West J Emerg Med Technology In Emergency Medicine INTRODUCTION: Point-of-care ocular ultrasound (US) is a valuable tool for the evaluation of traumatic ocular injuries. Conventionally, any maneuver that may increase intraocular pressure (IOP) is relatively contraindicated in the setting of globe rupture. Some authors have cautioned against the use of US in these scenarios because of a theoretical concern that an US examination may cause or exacerbate the extrusion of intraocular contents. This study set out to investigate whether ocular US affects IOP. The secondary objective was to validate the intraocular pressure measurements obtained with the Diaton® as compared with standard applanation techniques (the Tono-Pen®). METHODS: We enrolled a convenience sample of healthy adult volunteers. We obtained the baseline IOP for each patient by using a transpalpebral tonometer. Ocular US was then performed on each subject using a high-frequency linear array transducer, and a second IOP was obtained during the US examination. A third IOP measurement was obtained following the completion of the US examination. To validate transpalpebral measurement, a subset of subjects also underwent traditional transcorneal applanation tonometry prior to the US examination as a baseline measurement. In a subset of 10 patients, we obtained baseline pre-ultrasound IOP measurements with the Diaton® and Tono-Pen®, and then compared them. RESULTS: The study included 40 subjects. IOP values during ocular US examination were slightly greater than baseline (average +1.8mmHg, p=0.01). Post-US examination IOP values were not significantly different than baseline (average −0.15mmHg, p=0.42). In a subset of 10 subjects, IOP values were not significantly different between transpalpebral and transcorneal tonometry (average +0.03mmHg, p=0.07). CONCLUSION: In healthy volunteer subjects, point-of-care ocular US causes a small and transient increase in IOP. We also showed no difference between the Diaton® and Tono-Pen® methods of IOP measurement. Overall, the resulting change in IOP with US transducer placement is considerably less than the mean diurnal variation in healthy subjects, or pressure generated by physical examination, and is therefore unlikely to be clinically significant. However, it is important to take caution when performing ocular ultrasound, since it is unclear what the change in IOP would be in patients with ocular trauma. Department of Emergency Medicine, University of California, Irvine School of Medicine 2015-03 2015-03-06 /pmc/articles/PMC4380377/ /pubmed/25834668 http://dx.doi.org/10.5811/westjem.2015.1.24150 Text en Copyright © 2015 the authors. http://creativecommons.org/licenses/by/4.0 This is an open access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) License. See: http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Technology In Emergency Medicine Berg, Cameron Doniger, Stephanie J. Zaia, Brita Williams, Sarah R. Change in Intraocular Pressure During Point-of-Care Ultrasound |
title | Change in Intraocular Pressure During Point-of-Care Ultrasound |
title_full | Change in Intraocular Pressure During Point-of-Care Ultrasound |
title_fullStr | Change in Intraocular Pressure During Point-of-Care Ultrasound |
title_full_unstemmed | Change in Intraocular Pressure During Point-of-Care Ultrasound |
title_short | Change in Intraocular Pressure During Point-of-Care Ultrasound |
title_sort | change in intraocular pressure during point-of-care ultrasound |
topic | Technology In Emergency Medicine |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4380377/ https://www.ncbi.nlm.nih.gov/pubmed/25834668 http://dx.doi.org/10.5811/westjem.2015.1.24150 |
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