Beveled-Tip Versus(vs) Standard-Tip Vitrectomy Probe

High-speed beveled tip versus standard tip vitrectomy probe: a prospective randomized clinical trial

Background:

The Advanced Ultravit High-Speed Beveled Probe (Alcon) has a beveled-tip design that allows the cutting port to come closer to the retina compared to the previous vitrectr probe design. This allows the surgeon to maneuver in tight tissue planes and increases the functionality of the vitrector probe. This in combination with the increased cut rate of 10,000 independent cuts per minute reduces traction on the retina and increases efficiency of vitreous removal.

Purpose:

The purpose of this study is to compare the efficiency of the new Utravit High-Speed 10000 cpm Beveled Probe to the current standard vitrector probe- Alcon (non-beveled) Ultravit 7500 cpm.

Study Design:

This is a prospective, randomized controlled trial comparing the efficiency of the Advanced Ultravit High-Speed Beveled Probe with the current Alcon vitrector probe in a cohort of patients undergoing routine vitrectomy surgery.

Primary objectives:

-Intraoperative efficiency of vitrectomy surgery regarding time to completion of core vitrectomy and shave of vitreous base

Exploratory Objective:

-Intraoperative complications (e.g. iatrogenic retinal breaks, intraocular bleeding, retinal detachment)

Postoperative complications:

The study will not be sufficiently powered to assess safety. Surgeons will want to make sure there is no significant increase in complications with a different probe. However, any post operative complications would merely be an association, without any causality attributed.

Primary Endpoint:

A clinically significant difference in time to completion of core vitrectomy and shave of vitreous base between the two groups with 80% power at a 95% confidence interval.

A p-value of less than 0.05 will be deemed as statistically significant.

Sample Size Calculation Target: 40 participants (20 in each cohort) Assuming an average core vitrectomy time of 12 +/- 3 minutes, a sample size of at least 32 is needed to adequately assess for a clinically significant difference between the two groups with 80% power at a 95% confidence interval. A p-value of less than 0.05 will be deemed as statistically significant.

Procedures and Assessments:

All patients will undergo baseline testing in the study eye including:

• Best corrected Visual Acuity (BCVA)
• intraocular pressure (IOP)
• slit-lamp examination
• 360 degree indirect ophthalmoscopy

Enrollment Period:

9 months

Study Duration:

12 months

Methods:

On the day of surgery, patients will be randomized to the Ultravit High-Speed Beveled Probe or the current non-beveled Alcon Probe. All patients will undergo routine vitrectomy surgery as scheduled; patients will be masked to the vitrector probe used. Time to completion of vitrectomy and time to completion of vitreous base shave will be recorded by a masked timer.

All examination will be repeated as regularly scheduled postoperative visits by a masked reader.

Safety will be assessed at each visit by evaluation for any adverse events.

Randomization:

Randomization and data storage will occur in RedCap. Patients will be randomized the day of surgery. The randomization numbers will be generated using the following procedure to ensure that treatment assignment is unbiased and concealed from patients and investigator staff. A patient randomization list will be produced by the IRT provider using a validated system that automates the random assignment of patient numbers to randomization numbers. These randomization numbers are linked to the different treatment arms. The randomization scheme for patients will be reviewed and approved by a member of the Randomization Group.

Data collection measures:

• Unique Patient identifier
• Vision
• IOP
• Oculus sinister (Left Eye) /Ocular Dexter (Right Eye)
• Surgical Indication
• Time to completion of vitrectomy
• Time to completion of vitreous base shave
• Slit-lamp abnormalities
• Dilated Fundus Exam (DFE) abnormalities
• Post operation complications
• Data collection April 2019 to Dec 2019
• Data Analysis Jan 2020

Adverse Events:

Reporting of Adverse Events, Serious Adverse Events, and Unanticipated Problems Involving Risk to Participants or Others will be reported to the Institutional Review Board (IRB) pursuant to their policy as outlined under the VANDERBILT HUMAN RESEARCH PROTECTIONS PROGRAM Policy III.L.

Safety:

Risk Minimization:

The study will be conducted in accordance with the International Conference on Harmonization (ICH) along with the Good Clinical Practices (GCP) guidelines and all applicable local and U.S. federal regulatory requirements.

Prior to entry into the study or initiation of any study related procedures, the subject or legal representative must read, sign, and date the current institutional review board-approved version of the informed consent form. Fully informed consent or verbal consent must be obtained from the subject or legal representative in accordance with local legal requirements and IRB requirements.

Only potential subjects who meet the inclusion/exclusion criteria will be enrolled in to this protocol. The Principal Investigator will oversee all study procedures to ensure subject safety and protocol compliance.

Risk v. Benefits:

The prospective subject will be carefully screened to ensure inclusion/exclusion criteria are met.

There may be no direct benefit to the subjects ;however, the knowledge gained from this study may lead to improved methods of diagnosing, staging and managing Vitrectomy surgery in the future.

There will be no specific ethnic or age group targeted or excluded.