Factors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients

Vannarut Satitpitakul, Nopphawan Uramphorn, Ngamjit KasetsuwanDepartment of Ophthalmology, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cress Society, Bangkok, ThailandCorrespondence: Vannarut SatitpitakulDepartment of Ophthalmology, Faculty of Med...

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Autores principales:	Satitpitakul V, Uramphorn N, Kasetsuwan N
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2019
Materias:	corneal astigmatism corneal transplantation keratoplasty corneal biomechanics Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/e4c884e945ab4de59bc688c12e4ced3b
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spelling	oai:doaj.org-article:e4c884e945ab4de59bc688c12e4ced3b2021-12-02T10:55:16ZFactors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients1177-5483https://doaj.org/article/e4c884e945ab4de59bc688c12e4ced3b2019-08-01T00:00:00Zhttps://www.dovepress.com/factors-predicting-change-in-corneal-astigmatism-following-suture-remo-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Vannarut Satitpitakul, Nopphawan Uramphorn, Ngamjit KasetsuwanDepartment of Ophthalmology, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cress Society, Bangkok, ThailandCorrespondence: Vannarut SatitpitakulDepartment of Ophthalmology, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cress Society, 1873 Rama 4 Road, Pathuwan, Bangkok 10330, ThailandTel +66 89 495 9022Fax +66 2 252 8290Email vannaruts@gmail.comPurpose: To identify factors predicting corneal astigmatic change following suture removal in post-penetrating keratoplasty patients.Patients and methods: This cross-sectional study included the data of 33 events of corneal suture removal from 27 post-penetrating keratoplasty patients. Sutures were removed from the steep axis of transplanted cornea with 16 interrupted corneal sutures. Corneal astigmatism was measured before and after suture removal using ORBSCAN II. Patients’ demographic data and corneal biomechanics parameters obtaining from the Corvis ST were recorded. The changes in corneal astigmatism were calculated using vector analysis. The correlation between changes in corneal astigmatism and the potential factors was evaluated using Spearman’s correlation coefficient and linear regression model.Results: The mean corneal astigmatism before and after suture removal was 7.1±3.7 diopters (D) and 5.5±3.2D, respectively. The mean astigmatic change was 7.0±6.3D (range, 0.3–30.8D) by vector analysis at 9.7±5.5 weeks after suture removal. Change in corneal astigmatism was significantly correlated with pre-suture removal astigmatism (Rs=0.47, P=0.01). There was no correlation between the donor-recipient trephine diameter difference, the duration from corneal transplantation to suture removal, the number of removed sutures with the change in corneal astigmatism, and corneal biomechanics parameters (P>0.05). Linear regression is given by the following equation: astigmatic change (D)=1.05x pre-suture removal astigmatism (D) - 0.43.Conclusion: The astigmatic change after corneal suture removal in post-keratoplasty patients was significantly correlated with pre-suture removal astigmatism. These findings will permit a validated approach for reducing corneal astigmatism in post-keratoplasty patients.Keywords: corneal astigmatism, corneal transplantation, keratoplasty, corneal biomechanicsSatitpitakul VUramphorn NKasetsuwan NDove Medical Pressarticlecorneal astigmatismcorneal transplantationkeratoplastycorneal biomechanicsOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 13, Pp 1593-1597 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	corneal astigmatism corneal transplantation keratoplasty corneal biomechanics Ophthalmology RE1-994
spellingShingle	corneal astigmatism corneal transplantation keratoplasty corneal biomechanics Ophthalmology RE1-994 Satitpitakul V Uramphorn N Kasetsuwan N Factors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients
description	Vannarut Satitpitakul, Nopphawan Uramphorn, Ngamjit KasetsuwanDepartment of Ophthalmology, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cress Society, Bangkok, ThailandCorrespondence: Vannarut SatitpitakulDepartment of Ophthalmology, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cress Society, 1873 Rama 4 Road, Pathuwan, Bangkok 10330, ThailandTel +66 89 495 9022Fax +66 2 252 8290Email vannaruts@gmail.comPurpose: To identify factors predicting corneal astigmatic change following suture removal in post-penetrating keratoplasty patients.Patients and methods: This cross-sectional study included the data of 33 events of corneal suture removal from 27 post-penetrating keratoplasty patients. Sutures were removed from the steep axis of transplanted cornea with 16 interrupted corneal sutures. Corneal astigmatism was measured before and after suture removal using ORBSCAN II. Patients’ demographic data and corneal biomechanics parameters obtaining from the Corvis ST were recorded. The changes in corneal astigmatism were calculated using vector analysis. The correlation between changes in corneal astigmatism and the potential factors was evaluated using Spearman’s correlation coefficient and linear regression model.Results: The mean corneal astigmatism before and after suture removal was 7.1±3.7 diopters (D) and 5.5±3.2D, respectively. The mean astigmatic change was 7.0±6.3D (range, 0.3–30.8D) by vector analysis at 9.7±5.5 weeks after suture removal. Change in corneal astigmatism was significantly correlated with pre-suture removal astigmatism (Rs=0.47, P=0.01). There was no correlation between the donor-recipient trephine diameter difference, the duration from corneal transplantation to suture removal, the number of removed sutures with the change in corneal astigmatism, and corneal biomechanics parameters (P>0.05). Linear regression is given by the following equation: astigmatic change (D)=1.05x pre-suture removal astigmatism (D) - 0.43.Conclusion: The astigmatic change after corneal suture removal in post-keratoplasty patients was significantly correlated with pre-suture removal astigmatism. These findings will permit a validated approach for reducing corneal astigmatism in post-keratoplasty patients.Keywords: corneal astigmatism, corneal transplantation, keratoplasty, corneal biomechanics
format	article
author	Satitpitakul V Uramphorn N Kasetsuwan N
author_facet	Satitpitakul V Uramphorn N Kasetsuwan N
author_sort	Satitpitakul V
title	Factors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients
title_short	Factors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients
title_full	Factors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients
title_fullStr	Factors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients
title_full_unstemmed	Factors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients
title_sort	factors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients
publisher	Dove Medical Press
publishDate	2019
url	https://doaj.org/article/e4c884e945ab4de59bc688c12e4ced3b
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Factors predicting change in corneal astigmatism following suture removal in post-penetrating keratoplasty patients

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