Journals / Glokom Katarakt / 2011 / Cilt: 6 - Sayı: 3

Changes in corneal biomechanics following intraocular pressure reduction by trabeculectomy

Trabekülektomi sonrası göz içi basıncındaki düşüş ile birlikte korneal biyomekanik parametrede oluşan değişimler

Pages
168–172
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Further studies are needed to answer the question of whether or not changes in corneal biomechanics after IOP reduction has a role in alterating the progression of glaucomatous damage.

📌 3 Key Takeaways

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Objective & Hypothesis:Purpose: To evaluate and compare corneal biomechanical parameters in primary open angle glaucoma patients prior to and following intraocular pressure (IOP) reduction by trabeculectomy.
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Key Findings & Data:Materials and Methods: We reviewed the charts of 23 patients with one eye that had undergone succesful trabeculectomy.
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Conclusion & Impact:Further studies are needed to answer the question of whether or not changes in corneal biomechanics after IOP reduction has a role in alterating the progression of glaucomatous damage.
🔬Design:Review & Systematic Survey
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Purpose: To evaluate and compare corneal biomechanical parameters in primary open angle glaucoma patients prior to and following intraocular pressure (IOP) reduction by trabeculectomy. Materials and Methods: We reviewed the charts of 23 patients with one eye that had undergone succesful trabeculectomy. Corneal hysteresis (CH), corneal resistance factor (CRF) that were recorded prior to and 1 week, 1 month and 3 months after trabeculectomy in paired eyes of the same patients were compared. The correlations between postoperative change in corneal biomechanical parameters and IOP reduction were also analysed. Results: The mean preoperative cornea compensated intraocular pressure (IOPcc) was 26.6±4.0 mmHg and the mean postoperative IOPcc after 1 week was 15.2±7.2 mmHg (p<0.001). Preoperative CH increased significantly from 6.4±1.2 mmHg to 8.6±1.5 mmHg at postoperative 1st week (p<0.001), with no significant changes after that. CRF on the other hand decreased from 9.7±2.5 to 8.0±1.8 at 1st week (p=0.003). Changes in CH was negatively correlated with changes in IOPcc (r=-0.642, p=0.001); and changes in CRF was positively correlated with changes in IOPcc (r=0.689, p<0.001). Central corneal thickness was not changed significantly during follow up period. Conclusion: In our investigation, corneal biomechanic was influenced by IOP. CH which was significantly lower in glaucomatous eyes with high pressure, and partial recovery occurred after successful IOP lowering therapy. Further studies are needed to answer the question of whether or not changes in corneal biomechanics after IOP reduction has a role in alterating the progression of glaucomatous damage.

Özet

Amaç: Primer açık açılı glokom olgularında trabekülektomi ile sağlanan göz içi basıncında (GİB) oluşan düşüşünün korneal biyomekanik parametreler üzerindeki etkisini incelemek. Gereç ve Yöntem: Başarılı bir trabekülektomi ile GİB düşürülen 23 olgunun kayıtları incelendi. Olguların ameliyat öncesi ve ameliyat sonrası 1. hafta, 1. ay ve 3. aylara ait her iki gözlerinden elde edilen korneal histeresis (KH), korneal resistans faktörü (KRF) değerlerinde ki değişim analiz edildi. Ayrıca, GİB’daki değişim ile korneal biyomekanik parametrelerdeki değişimin korelasyonuna bakıldı. Bulgular: Ameliyat öncesi 26.6±4.0 mmHg olan ortalama kornea kompanse GİB (GİBcc) ameliyat sonrası 1. haftada 15.2±7.2 mmHg (p<0.001) olarak bulundu. Ameliyat öncesi 6.4±1.2 mmHg olarak tespit edilen ortalama KH’in ameliyat sonrası 1. haftada anlamlı miktarda arttığı (8.6±1.5 mmHg), (p<0.001) ve bu düzeyini izlem süresince koruduğu görüldü. Ameliyat öncesi 9.7±2.5 olarak bulunan KRF’ün ise ameliyat sonrası 1. haftada 8.0±1.8 seviyesine düştüğü tespit edildi (p=0.003). Yapılan korelasyon analizinde KH’deki artış ile GİBcc’deki düşüş arasında anlamlı negatif (r=-0.642, p=0.001); KRF’deki düşüş ile GİBcc’deki düşüş arasında anlamlı pozitif (r=0.689, p<0.001) korelasyon olduğu tespit edildi. İzlem süresi içerisinde merkezi kornea kalınlığında anlamlı düzeyde değişim saptanmadı. Sonuç: Bu çalışmanın sonuçları korneal biyomekaniğin GİB’ndan etkilendiğini göstermektedir. GİB yüksek glokomlu olgularda düşük olarak ölçülen KH; GİB’ndaki düşüş ile birlikte artmaktadır. Korneal biyomekanik parametrelerde GİB düşüşünden sonra tespit edilen değişimlerin glokomun progresyonu üzerindeki etkisini ortaya koymaya yönelik ileri çalışmalara gerek vardır.

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Cite This Article

ÇANKAYA, A. B., ÖZÇELİK, D., ŞİMŞEK, T., YILMAZBAŞ, P. (2011). Changes in corneal biomechanics following intraocular pressure reduction by trabeculectomy. Glokom Katarakt, Cilt: 6 - Sayı: 3, 168–172. https://ajindex.com/articles/226514

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