Clinical trial NCT03945695: Pneumovitreolysis for Vitreomacular Traction
Official title: Pneumatic Vitreolysis Using the Drinking Bird Technique for Management of Vitreomacular Traction. A Prospective, Non-randomized, Interventional Study.
Study type: INTERVENTIONAL
Overall status: TERMINATED
Phase: NA
Conditions: Vitreomacular Traction Syndrome
Keywords: VMT
VMA
Vitreomacular Adhesion
Pneumatic Vitreolysis
Lead sponsor: University of Split, School of Medicine
Sponsor class: OTHER
First posted: 2019-05-10
Enrollment: 12
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Intervention model description: Prospective, non-randomized, non-blinded, interventional single-arm pilot study.
Primary purpose: TREATMENT

Brief summary: In this prospective, non-randomized, single-arm pilot study, conducted at the Eye Clinic of the University Hospital Split, the investigators are going to evaluate the utility of a single intravitreal injection of sulfur hexafluoride in the treatment of patients with symptomatic vitreomacular traction. Following the injection patients are going to be instructed to bend forward several times a day, resembling a drinking bird, hence the name of this maneuver. The investigators plan to include approximately ten eyes, which will be followed up for a three month period. Outcome measures will be common parameters, like adhesion resolution, also to increase comparability with previously conducted studies. The collected data will be used to get an impression of the efficacy and safety of this intervention. Furthermore it will aid in the performance of a power analysis to determine an appropriate sample size for later larger studies.

Detailed description: The Ethical Committee of the Split Clinical Hospital Center previously already gave consent for the conduction of this research. Any personal data obtained in this research was and will be kept and handled strictly confidential and according to the Medical Code of Ethics. All reports generated on the basis of this study will utilize the data of a sample of patients with the diagnosis of vitreomacular traction fulfilling the eligibility criteria prior to intervention. The purpose of the examinations, procedures, possible advantages, disadvantages and possible side effects of the intervention will be explained to all participants, possible questions are going to be answered and a signed informed consent obtained.

Patients are going to be selected by the study chair from his pool of patients according to the criteria of inclusion and exclusion, as stated below. After obtaining informed consent all patients will be assigned into the intervention group and receive treatment according to our predefined procedural protocol. Neither participants nor researchers will be blinded during the whole course of the study.

One of the investigators carries out regular control examinations at one week after the procedure, and then every 2 to 4 weeks thereafter. During each control examination visual acuity and intraocular pressure will be measured, moreover biomicroscopy, indirect ophthalmoscopy, and macular OCT (Cirrus OCT 5000 HD, Zeiss) of the treated eye are going to be performed. The following data are also going to be recorded by the same investigator: patient demographics (age, gender, right eye in relation to left eye), period of intravitreal injection of gas to the separation of the posterior vitreous body (PVD) and monitoring time. Any adverse events that have occurred after gas injection, including eye complications (eg. retinal tear or ablation, infections, increase in intraocular pressure, uveitis, bleeding and damage to the optic nerve), and systemic complications, are going to be recorded.

Statistical Analysis will be performed using IBM SPSS©. Descriptive Statistics will include patient demographic data and baseline characteristics. The mean, standard deviations, median, minimum, and maximum will be reported for continuous variables, whereas frequencies and proportions are going to be described for categorical variables. The investigators will furthermore utilize the collected data to perform a power analysis and determine an appropriate sample size for future studies evaluating the utility of a single intravitreal injection of SF6 in the management of symptomatic vitreomacular traction.

Eligibility criteria: Inclusion Criteria:

* 18 years or older
* able to give written informed consent to the procedure
* diagnosis of symptomatic VMT based on clinical and OCT-findings

Exclusion Criteria:

* any form of retinal tear, macular degeneration, vascular occlusion of the retina, aphakia, high myopia (\> -8 diopters), uncontrolled glaucoma, vitreous opacities, retinal ablation, previous vitrectomy surgery.

Primary outcomes:
measure: Resolution of VMT
timeFrame: Three months
Secondary outcomes:
measure: Best corrected visual acuity improvement
timeFrame: One week, two weeks, one month, three months
measure: Foveal outline
timeFrame: One week, two weeks, one month, three months
measure: Central foveal thickness
timeFrame: One week, two weeks, one month, three months
measure: Maximum central foveal thickness
timeFrame: Three months
measure: Time needed for resolution
timeFrame: Three months
measure: Side-effects
timeFrame: Three months
measure: Occurrence of retinal tear or ablatio
timeFrame: Three months
measure: Number of patients recommended to undergo further therapy by vitrectomy
timeFrame: Three months
Other outcomes:
Locations:
city: Split
country: Croatia
facility: University Hospital of Split, Department of Ophthalmology
Study officials:
affiliation: Department of Ophthalmology, University Hospital of Split
name: Ljubo Znaor, Assist. Prof., MD, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Chang LK, Fine HF, Spaide RF, Koizumi H, Grossniklaus HE. Ultrastructural correlation of spectral-domain optical coherence tomographic findings in vitreomacular traction syndrome. Am J Ophthalmol. 2008 Jul;146(1):121-7. doi: 10.1016/j.ajo.2008.03.001. Epub 2008 Apr 25.
citation: Steel DH, Downey L, Greiner K, Heimann H, Jackson TL, Koshy Z, Laidlaw DA, Wickham L, Yang Y. The design and validation of an optical coherence tomography-based classification system for focal vitreomacular traction. Eye (Lond). 2016 Feb;30(2):314-24; quiz 325. doi: 10.1038/eye.2015.262. Epub 2016 Jan 15.
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citation: Folk JC, Adelman RA, Flaxel CJ, Hyman L, Pulido JS, Olsen TW. Idiopathic Epiretinal Membrane and Vitreomacular Traction Preferred Practice Pattern((R)) Guidelines. Ophthalmology. 2016 Jan;123(1):P152-81. doi: 10.1016/j.ophtha.2015.10.048. Epub 2015 Nov 12.
citation: Dimopoulos S, Bartz-Schmidt KU, Gelisken F, Januschowski K, Ziemssen F. Rate and timing of spontaneous resolution in a vitreomacular traction group: should the role of watchful waiting be re-evaluated as an alternative to ocriplasmin therapy? Br J Ophthalmol. 2015 Mar;99(3):350-3. doi: 10.1136/bjophthalmol-2014-304961. Epub 2014 Oct 23.
citation: Neffendorf JE, Simpson ARH, Steel DHW, Desai R, McHugh DA, Pringle E, Jackson TL. Intravitreal gas for symptomatic vitreomacular adhesion: a synthesis of the literature. Acta Ophthalmol. 2018 Nov;96(7):685-691. doi: 10.1111/aos.13547. Epub 2017 Aug 31.
citation: Ochoa-Contreras D, Delsol-Coronado L, Buitrago ME, Velasco-Barona C, Quiroz-Mercado H. Induced posterior vitreous detachment by intravitreal sulfur hexafluoride (SF6) injection in patients with nonproliferative diabetic retinopathy. Acta Ophthalmol Scand. 2000 Dec;78(6):687-8. doi: 10.1034/j.1600-0420.2000.078006687.x.
citation: Rodrigues IA, Stangos AN, McHugh DA, Jackson TL. Intravitreal injection of expansile perfluoropropane (c(3)f(8)) for the treatment of vitreomacular traction. Am J Ophthalmol. 2013 Feb;155(2):270-276.e2. doi: 10.1016/j.ajo.2012.08.018. Epub 2012 Nov 17.
citation: Jorge R, Costa RA, Cardillo JA, Uno F, Bonomo PP, Farah ME. Optical coherence tomography evaluation of idiopathic macular hole treatment by gas-assisted posterior vitreous detachment. Am J Ophthalmol. 2006 Nov;142(5):869-71. doi: 10.1016/j.ajo.2006.05.062.
citation: Steinle NC, Dhoot DS, Quezada Ruiz C, Castellarin AA, Pieramici DJ, See RF, Couvillion SC, Nasir MA, Avery RL. TREATMENT OF VITREOMACULAR TRACTION WITH INTRAVITREAL PERFLUOROPROPANE (C3F8) INJECTION. Retina. 2017 Apr;37(4):643-650. doi: 10.1097/IAE.0000000000001237.
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