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KMID : 1813520160050020032
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Journal of the Korean Glaucoma Society
2016 Volume.5 No. 2 p.32 ~ p.37
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Changing the Inner Diameter of the Silicone Tube after Undergoing Different Ligation Suture Methods
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Lee Mar-Vin
Rho Seung-Soo
Yun Il-Suk
Ahn Jae-Hong
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Abstract
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Purpose : This study aims to investigate and compare the changes of the inner diameter of the silicone tube of Ahmed valve after various ligation methods using anterior segment spectral-domain optical coherence tomography (AS-OCT).
Methods : In this study we prepared 25 different tubes for the in vitro examination. 5 tubes were allocated for each group. Tubes in group A were not ligated. In group B and group C, tubes were ligated externally with 7-0 Vicryl and 8-0 Vicryl, respectively. In Group D, 7-0 Prolene sutures were inserted inside the tubes as a stent and then the tubes were ligated externally with 7-0 Vicryl. In Group E, 7-0 Prolene sutures were inserted inside the tubes and then the tubes were ligated externally with 8-0 Vicryl. All ligations were made with maximal force as much as possible. For measuring inner diameter of each tube the OCT imaging was performed using Cirrus-OCT software version 4.5.
Results : Mean inner diameter of Ahmed valve was 246.4 μm without any ligation. Mean inner diameter was 15.0 μm and 62.0 μm when ligation was applied with 7-0 Vicryl and 8-0 Vicryl respectively. Mean inner diameters were 147.6 μm and 163.2 μm when ligations were conducted by 7-0 Vicryl and 8-0 Vicryl respectively after inserting the 7-0 Prolene suture inside each tube. Inner diameter of silicone tube after the ligation using 8-0 Vicryl was wider than inner diameter after the ligation using 7-0 Vicryl (Mann-Whiteney U test, p = 0.008). But there were no differences of inner diameter for the respect of different external ligation methods when ligation was applied after inserting suture stent inside tube (p = 0.22) and after removal of the inner suture (p = 0.31)
Conclusions : If a surgeon wants total ligation of silicone tube of Ahmed valve, external ligation with 7-0 Vicryl can be recommended. But, if the surgeon wants partial ligation the material doesn't matter.
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KEYWORD
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Ahmed valve, ligation, Inner diameter
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