Anterior Segment Optical Coherence Tomographic Angiography Assessment of Acute Chemical Injury

Simon S.M. Fung*, Rosalind M.K. Stewart, Sandeep K. Dhallu, Dawn A. Sim, Pearse A. Keane, Mark R. Wilkins, Stephen J. Tuft

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Purpose: To compare routine clinical examination with optical coherence tomography angiography (OCTA) for the assessment of limbal conjunctival ischemia following a chemical burn. Setting: Validity analysis. Methods: We assessed 10 participants (15 eyes) with an acute chemical injury. Clinical photographs were used to determine the extent of any limbal conjunctival epithelial defect and ischemia. These were compared with the extent of limbal ischemia identified on OCTA images of the ocular surface. Quantitative and longitudinal analysis using the OCTA software were also performed. Correlations with visual outcome were sought using clinical and OCTA-derived variables. Results: The extent of clinically determined limbal ischemia was less than that identified with OCTA (2.3±3.6 clock hours vs 5.1±4.2 clock hours, P =.003), which in turn was less than the size of limbal conjunctival epithelial defect (7.3±5.1 clock hours, P =.03). Longitudinal OCTA analysis showed that mean vessel area increased by 0.2%±0.1% during the study, corresponding to a rate of vascular recovery of 0.9 mm2/d. Significant correlations were found between visual outcome at 3 months and limbal conjunctival fluorescein staining (r = 0.67, P =.006), and limbal conjunctival ischemia on OCTA (r = 0.76, P =.001). Conclusions: OCTA can objectively identify and monitor the recovery of limbal ischemia following an acute ocular chemical injury. OCTA confirms that limbal ischemia is usually more extensive than is suggested by clinical examination, and the former is highly correlated with visual outcome. OCTA therefore is a useful tool in the management of ocular chemical injury.

Original languageEnglish
Pages (from-to)165-174
Number of pages10
JournalAmerican Journal of Ophthalmology
Volume205
Early online date10 May 2019
DOIs
Publication statusPublished - 1 Sep 2019

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Optical Coherence Tomography
Angiography
Wounds and Injuries
Ischemia
Eye Injuries
Chemical Burns
Fluorescein
Blood Vessels
Software
Staining and Labeling

Cite this

Fung, S. S. M., Stewart, R. M. K., Dhallu, S. K., Sim, D. A., Keane, P. A., Wilkins, M. R., & Tuft, S. J. (2019). Anterior Segment Optical Coherence Tomographic Angiography Assessment of Acute Chemical Injury. American Journal of Ophthalmology, 205, 165-174. https://doi.org/10.1016/j.ajo.2019.04.021
Fung, Simon S.M. ; Stewart, Rosalind M.K. ; Dhallu, Sandeep K. ; Sim, Dawn A. ; Keane, Pearse A. ; Wilkins, Mark R. ; Tuft, Stephen J. / Anterior Segment Optical Coherence Tomographic Angiography Assessment of Acute Chemical Injury. In: American Journal of Ophthalmology. 2019 ; Vol. 205. pp. 165-174.
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abstract = "Purpose: To compare routine clinical examination with optical coherence tomography angiography (OCTA) for the assessment of limbal conjunctival ischemia following a chemical burn. Setting: Validity analysis. Methods: We assessed 10 participants (15 eyes) with an acute chemical injury. Clinical photographs were used to determine the extent of any limbal conjunctival epithelial defect and ischemia. These were compared with the extent of limbal ischemia identified on OCTA images of the ocular surface. Quantitative and longitudinal analysis using the OCTA software were also performed. Correlations with visual outcome were sought using clinical and OCTA-derived variables. Results: The extent of clinically determined limbal ischemia was less than that identified with OCTA (2.3±3.6 clock hours vs 5.1±4.2 clock hours, P =.003), which in turn was less than the size of limbal conjunctival epithelial defect (7.3±5.1 clock hours, P =.03). Longitudinal OCTA analysis showed that mean vessel area increased by 0.2{\%}±0.1{\%} during the study, corresponding to a rate of vascular recovery of 0.9 mm2/d. Significant correlations were found between visual outcome at 3 months and limbal conjunctival fluorescein staining (r = 0.67, P =.006), and limbal conjunctival ischemia on OCTA (r = 0.76, P =.001). Conclusions: OCTA can objectively identify and monitor the recovery of limbal ischemia following an acute ocular chemical injury. OCTA confirms that limbal ischemia is usually more extensive than is suggested by clinical examination, and the former is highly correlated with visual outcome. OCTA therefore is a useful tool in the management of ocular chemical injury.",
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Fung, SSM, Stewart, RMK, Dhallu, SK, Sim, DA, Keane, PA, Wilkins, MR & Tuft, SJ 2019, 'Anterior Segment Optical Coherence Tomographic Angiography Assessment of Acute Chemical Injury', American Journal of Ophthalmology, vol. 205, pp. 165-174. https://doi.org/10.1016/j.ajo.2019.04.021

Anterior Segment Optical Coherence Tomographic Angiography Assessment of Acute Chemical Injury. / Fung, Simon S.M.; Stewart, Rosalind M.K.; Dhallu, Sandeep K.; Sim, Dawn A.; Keane, Pearse A.; Wilkins, Mark R.; Tuft, Stephen J.

In: American Journal of Ophthalmology, Vol. 205, 01.09.2019, p. 165-174.

Research output: Contribution to journalArticle

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AU - Stewart, Rosalind M.K.

AU - Dhallu, Sandeep K.

AU - Sim, Dawn A.

AU - Keane, Pearse A.

AU - Wilkins, Mark R.

AU - Tuft, Stephen J.

PY - 2019/9/1

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N2 - Purpose: To compare routine clinical examination with optical coherence tomography angiography (OCTA) for the assessment of limbal conjunctival ischemia following a chemical burn. Setting: Validity analysis. Methods: We assessed 10 participants (15 eyes) with an acute chemical injury. Clinical photographs were used to determine the extent of any limbal conjunctival epithelial defect and ischemia. These were compared with the extent of limbal ischemia identified on OCTA images of the ocular surface. Quantitative and longitudinal analysis using the OCTA software were also performed. Correlations with visual outcome were sought using clinical and OCTA-derived variables. Results: The extent of clinically determined limbal ischemia was less than that identified with OCTA (2.3±3.6 clock hours vs 5.1±4.2 clock hours, P =.003), which in turn was less than the size of limbal conjunctival epithelial defect (7.3±5.1 clock hours, P =.03). Longitudinal OCTA analysis showed that mean vessel area increased by 0.2%±0.1% during the study, corresponding to a rate of vascular recovery of 0.9 mm2/d. Significant correlations were found between visual outcome at 3 months and limbal conjunctival fluorescein staining (r = 0.67, P =.006), and limbal conjunctival ischemia on OCTA (r = 0.76, P =.001). Conclusions: OCTA can objectively identify and monitor the recovery of limbal ischemia following an acute ocular chemical injury. OCTA confirms that limbal ischemia is usually more extensive than is suggested by clinical examination, and the former is highly correlated with visual outcome. OCTA therefore is a useful tool in the management of ocular chemical injury.

AB - Purpose: To compare routine clinical examination with optical coherence tomography angiography (OCTA) for the assessment of limbal conjunctival ischemia following a chemical burn. Setting: Validity analysis. Methods: We assessed 10 participants (15 eyes) with an acute chemical injury. Clinical photographs were used to determine the extent of any limbal conjunctival epithelial defect and ischemia. These were compared with the extent of limbal ischemia identified on OCTA images of the ocular surface. Quantitative and longitudinal analysis using the OCTA software were also performed. Correlations with visual outcome were sought using clinical and OCTA-derived variables. Results: The extent of clinically determined limbal ischemia was less than that identified with OCTA (2.3±3.6 clock hours vs 5.1±4.2 clock hours, P =.003), which in turn was less than the size of limbal conjunctival epithelial defect (7.3±5.1 clock hours, P =.03). Longitudinal OCTA analysis showed that mean vessel area increased by 0.2%±0.1% during the study, corresponding to a rate of vascular recovery of 0.9 mm2/d. Significant correlations were found between visual outcome at 3 months and limbal conjunctival fluorescein staining (r = 0.67, P =.006), and limbal conjunctival ischemia on OCTA (r = 0.76, P =.001). Conclusions: OCTA can objectively identify and monitor the recovery of limbal ischemia following an acute ocular chemical injury. OCTA confirms that limbal ischemia is usually more extensive than is suggested by clinical examination, and the former is highly correlated with visual outcome. OCTA therefore is a useful tool in the management of ocular chemical injury.

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