- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04344522
Descemet Membrane Endothelial Keratoplasty Combined With Intraocular Lens Exchange: Sequential Versus Combined Surgery
Study Overview
Status
Detailed Description
Pseudophakic Bullous keratopathy is the second leading indication for endothelial keratoplasty. One of the main controversies in the management of PBK in the presence of an AC IOl is whether to retain the IOL or perform an IOL exchange with a PC IOL. The investigators believe that retention of an AC IOL can be hazardous to the DMEK graft due to reduced depth of the anterior chamber and traumatic touch between the graft and the IOL during graft unfolding and even postoperatively. On the other hand , performing an IOL exchange is relatively time consuming and requires excess manipulation of the iris tissue with the risk of intraoperative hyphema and postoperative inflammation which can affect the endothelial graft survival and cell count.
Aim of the study : to compare the outcome and complications between performing intraocular lens (IOL) exchange and Descemet membrane endothelial keratoplasty (DMEK) as single stage versus two stage procedure in the management of pseudophakic bullous keratopathy associated with anterior chamber IOL.
Methods :
The study will be a prospective randomized controlled trial. Eligible subjects with pseudophakic bullous keratopathy and AC IOL will be assigned into two groups each comprising 10 eyes. One group will undergo AC IOL exchange with posterior chamber (PC) IOL ( Poly methyl methacrylate (PMMA) lens or iris claw lens if there is no adequate capsular support) combined with DMEK in the same setting. The other group will undergo 2 stage procedure ; first one is IOL exchange , iridoplasty (if required) and inferior peripheral iridectomy and the second stage is DMEK one month later.
Study Type
Enrollment (Anticipated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Mohamed M Kolaib, MBBCh
- Phone Number: 00201283674800
- Email: mohamedkolaib@hotmail.com
Study Contact Backup
- Name: Mohamed B Goweida, MD
- Phone Number: 00201011755557
- Email: mbahgat@yahoo.com
Study Locations
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Alexandria, Egypt, 21111
- Recruiting
- Faculty of medicine
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Contact:
- Mohamed M Kolaib, MBBCh
- Phone Number: 00201283674800
- Email: mohamedkolaib@hotmail.com
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Contact:
- Mohamed B Goweida, MD
- Phone Number: 00201011755557
- Email: mbahgat@yahoo.com
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Patients having pseudophakic bullous keratopathy associated with an anterior chamber intraocular lens.
- Age above 18 years old.
Exclusion Criteria:
- Patients with corneal stromal scarring .
- Patients who had prior glaucoma drainage devices implantation. 3 Patient with non-repairable loss in the iris tissue.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Sequential Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Experimental: sequential 2 stage procedure
In this arm , the procedure will be performed in two stages ; the first stage will include performing IOL exchange together with iridoplasty ( if required) and inferior peripheral iridectomy (PI) and the second stage is performing DMEK one month later
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DMEK : it involves separating the Descemet membrane from a corneal donor graft , doing a descematorhexis in the recepient cornea , loading and injection of the graft into the anterior chamber , unfolding and fixing the graft to the recepient cornea by intracameral air bubble.
IOL exchange : it involves performing a corneoscleral tunnel , freeing the AC IOL from any adhesions and explanting it through the tunnel , then implanting a posterior chamber PMMA lens or iris claw lens if there is no adequate capsular support.
iridoplasty : repairing any iris defect by using 10/0 prolene.
Inferior peripheral iridectomy : performed by vannus scissor to avoid postoperative pupillary block due to the intracameral air .
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Experimental: combined single stage procedure
In this arm, both IOL exchange and DMEK will be performed in the same setting
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DMEK : it involves separating the Descemet membrane from a corneal donor graft , doing a descematorhexis in the recepient cornea , loading and injection of the graft into the anterior chamber , unfolding and fixing the graft to the recepient cornea by intracameral air bubble.
IOL exchange : it involves performing a corneoscleral tunnel , freeing the AC IOL from any adhesions and explanting it through the tunnel , then implanting a posterior chamber PMMA lens or iris claw lens if there is no adequate capsular support.
iridoplasty : repairing any iris defect by using 10/0 prolene.
Inferior peripheral iridectomy : performed by vannus scissor to avoid postoperative pupillary block due to the intracameral air .
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
postoperative endothelial cell loss in percentage
Time Frame: 3 months
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The postoperative endothelial cell count will be determined in cell/mm2 using the Konan Cellchek specular microscope (Konan Medical , Irvine, California , USA) at 3 months and compared to the preoperative endothelial cell count of the donor graft to calculate the percentage of endothelial cell loss
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3 months
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Best spectacle corrected visual acuity
Time Frame: 3 months
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best spectacle corrected visual acuity using the decimal system
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3 months
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postoperative hyphema and and intraocular pressure spikes
Time Frame: 1month postoperatively
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Any postoperative hyphema and anterior chamber inflammatory reactions will determined by slit lamp examination: Hyphema if found will be graded into :
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1month postoperatively
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Postoperative AC inflammatory reactions
Time Frame: 1 month postoperatively
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postoperative AC inflammatory reactions including cell and flare will be determined by slit lamp examination under high magnification: AC cells will be graded according to the Standardization of Uveitis Nomenclature (SUN) group grading system as following : Grade 0 : 5 or less cells in 1*1mm slit beam Grade 1 : 6- 15 cells in 1*1mm slit beam Grade II : 16-25 cells in 1*1mm slit beam Grade III : 26-50 cells in 1*1mm slit beam grade IV : more than 50 cells in 1*1mm slit beam . AC flare will be graded according to the SUN grading system : Grade 0 : none Grade I : faint Grade II : moderate ( iris and lens details still seen ) Grade III : Marked ( iris and lens details hazy) Grade IV : intense ( fixed and plastic aqueous ). |
1 month postoperatively
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Postoperative intraocular pressure spikes
Time Frame: 1 month postoperatively
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postoperative intracular pressure will be measured by Goldmann Applanation Tonometer in mmHg
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1 month postoperatively
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Keratometric values
Time Frame: 3 months
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Keratometric values will be determined in Diopters using Autorefractometer/Keratometer , the difference between the steep and flat keratometric values will determine the corneal astigamtism in diopters
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3 months
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central corneal thickness
Time Frame: 3 months postoperatively
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central corneal thickness will be determined in micrometer using the Konan Cellchek specular microscope (Konan Medical , Irvine, California , USA)
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3 months postoperatively
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graft detachment
Time Frame: 1 week postoperatively
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The occurrence of postoperative graft detachment will be determined by slit lamp examination .
The incidence of graft detachment will be determined in each group .
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1 week postoperatively
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Spherical equivalent
Time Frame: 3 months postoperatively
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spherical equivalent will be determined using the autorefractometer in diopters
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3 months postoperatively
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Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Mohamed M Kolaib, MBBCh, Alexandria Faculty of Medicine
- Study Chair: Mohamed B Goweida, MD, Alexandria Faculty of Medicine
Publications and helpful links
General Publications
- Dapena I, Ham L, Melles GR. Endothelial keratoplasty: DSEK/DSAEK or DMEK--the thinner the better? Curr Opin Ophthalmol. 2009 Jul;20(4):299-307. doi: 10.1097/ICU.0b013e32832b8d18.
- Ham L, Dapena I, van Luijk C, van der Wees J, Melles GR. Descemet membrane endothelial keratoplasty (DMEK) for Fuchs endothelial dystrophy: review of the first 50 consecutive cases. Eye (Lond). 2009 Oct;23(10):1990-8. doi: 10.1038/eye.2008.393. Epub 2009 Jan 30.
- Melles GR, Ong TS, Ververs B, van der Wees J. Preliminary clinical results of Descemet membrane endothelial keratoplasty. Am J Ophthalmol. 2008 Feb;145(2):222-227. doi: 10.1016/j.ajo.2007.09.021. Epub 2007 Dec 3.
- Woo JH, Ang M, Htoon HM, Tan D. Descemet Membrane Endothelial Keratoplasty Versus Descemet Stripping Automated Endothelial Keratoplasty and Penetrating Keratoplasty. Am J Ophthalmol. 2019 Nov;207:288-303. doi: 10.1016/j.ajo.2019.06.012. Epub 2019 Jun 19.
- Pricopie S, Istrate S, Voinea L, Leasu C, Paun V, Radu C. Pseudophakic bullous keratopathy. Rom J Ophthalmol. 2017 Apr-Jun;61(2):90-94. doi: 10.22336/rjo.2017.17.
- Ravalico G, Botteri E, Baccara F. Long-term endothelial changes after implantation of anterior chamber intraocular lenses in cataract surgery. J Cataract Refract Surg. 2003 Oct;29(10):1918-23. doi: 10.1016/s0886-3350(02)02052-7.
- Liarakos VS, Ham L, Dapena I, Tong CM, Quilendrino R, Yeh RY, Melles GR. Endothelial keratoplasty for bullous keratopathy in eyes with an anterior chamber intraocular lens. J Cataract Refract Surg. 2013 Dec;39(12):1835-45. doi: 10.1016/j.jcrs.2013.05.045.
- Gupta PK, Bordelon A, Vroman DT, Afshari NA, Kim T. Early outcomes of descemet stripping automated endothelial keratoplasty in pseudophakic eyes with anterior chamber intraocular lenses. Am J Ophthalmol. 2011 Jan;151(1):24-28.e1. doi: 10.1016/j.ajo.2010.07.003. Epub 2010 Oct 20.
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- DMEK ACIOL
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
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