Non-inferiority Trial of Iontophoretic Corneal Collagen Crosslinking (CXL) Compared to Standard Corneal Collagen Crosslinking in Progressive Keratoconus.

NCT ID: NCT01868620

Last Updated: 2019-07-16

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

TERMINATED

Clinical Phase

NA

Total Enrollment

28 participants

Study Classification

INTERVENTIONAL

Study Start Date

2013-05-31

Study Completion Date

2017-03-31

Brief Summary

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The primary purpose of the protocol is to compare the current standard CXL with iontophoretic CXL to provide evidence in relation to the efficacy and safety in progressive keratoconus.

Corneal collagen crosslinking (CXL) is the first surgical procedure that appears to halt the progression of keratoconus. In the current standard CXL, the central corneal epithelium must be debrided to efficiently permeate the corneal stroma with riboflavin. The epithelium debridement can cause severe pain, infection and stromal haze. The study hypothesis is that iontophorese CXL is as effective as standard CXL to stabilize a progressive keratoconus.

Detailed Description

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Keratoconus is a common bilateral progressive corneal ecstatic disease causing visual impairment by inducing irregular astigmatism and corneal opacities. This disorder typically begins during teenage years, progresses until the age of 30 to 40 years and, in severe forms, may need a corneal transplantation. CXL has changed the natural evolution of keratoconus. It creates links between collagen fibrils in order to rigidify the corneal stroma and slow down the progression of keratoconus. The corneal stroma is soaked with a riboflavin solution before being exposed to ultraviolet-A radiation.

In the current standard CXL, the central corneal epithelium must be debrided to allow the penetration of riboflavin into the cornea with a risk of side effects, such as pain for the first two post-operative days, temporary loss of visual acuity during the first three months, and serious complications such as infection and stromal opacity due to corneal scarring.

Iontophoresis is a non invasive technique in which a weak electric current is used to enhance the penetration of riboflavin into the cornea. The iontophoresis technique could allow intrastromal riboflavin diffusion, while keeping the corneal epithelium on, combining the efficiency of the standard procedure without the side effects of epithelial debridement.

Conditions

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Progressive Keratoconus

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Iontophoretic CXL

The iontophoretic CXL involves a constant current source and two electrodes. The main electrode is a circular cup, with a surrounding annular suction ring to affix the device on the cornea during the procedure. The electrode itself is a stainless steel grid, placed into the cup at a minimal distance from the cornea. The reservoir is filled with riboflavin solution. The generator applies a constant current of 1mA for a preset period of 5 min. After the riboflavin administration by iontophoresis, the cornea is irradiated by a UVA light for 3mW/cm2 during 30 minutes.

Group Type EXPERIMENTAL

Iontophoretic CXL

Intervention Type DEVICE

Standard CXL

In the standard CXL, the epithelium is mechanically removed. Then, a solution of riboflavin is instilled each minute for 30 minutes. Corneas are irradiated by a UVA light for 3mW/cm2 during 30 minutes.

Group Type ACTIVE_COMPARATOR

Standard CXL

Intervention Type DEVICE

Interventions

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Iontophoretic CXL

Intervention Type DEVICE

Standard CXL

Intervention Type DEVICE

Eligibility Criteria

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Inclusion Criteria

* Age ≥ 18 years old
* Corneal thickness ≥ 400 µm
* Progressive stage 1 to 3 keratoconus (Krumeich classification)

Exclusion Criteria

* Corneal thickness \< 400µm
* Stage 4 keratoconus (Krumeich classification)
* Concomitant corneal disease
* History of corneal surgery
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Sooft Italia

INDUSTRY

Sponsor Role collaborator

Centre de Référence National du Kératocône

OTHER

Sponsor Role collaborator

University Hospital, Toulouse

OTHER

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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François MALECAZE, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

Locations

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University Hospital Toulouse

Toulouse, Midi-Pyrenees, France

Site Status

Countries

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France

References

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Reference Type RESULT
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Other Identifiers

Review additional registry numbers or institutional identifiers associated with this trial.

HAO

Identifier Type: OTHER

Identifier Source: secondary_id

13 030 03

Identifier Type: -

Identifier Source: org_study_id

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