Evaluation of the Corneal Residence Time of Chitosan-N-acetylcysteine Eye Drops in Patients With Dry Eye Syndrome After Single and Multiple Instillation

In the elderly population, dry eye syndrome is a highly prevalent ocular disease. One mainstay of therapy for patients suffering from dry eye syndrome is the use of topically administered lubricants. One of the main disadvantages of the formulations currently available for the treatment of DES is the short residency time on the ocular surface, which increases the need for a frequent instillation of the lubricant.

Recently, Croma Pharma has introduced chitosan-N-acetylcysteine eye drops, designed for treatment of symptoms related to DES. Based on theoretical considerations and animal experiments, the new chitosan derivative may show an increased adhesion to mucins of the ocular surface and may therefore considerably increase the residence on the ocular surface. This, in turn, would limit the need for frequent treatment and decrease the burden for the patients.

It has been shown in recent Phase I studies that chitosan-N-acetylcysteine eye drops are safe and well tolerated after single and repeated instillation. The current study seeks to investigate the ocular residency time after a single dose and after 5 day b.i.d. treatment. For this purpose 2 cohorts are planned: In Cohort I, chitosan-N-acetylcysteine eye drops will be instilled once in one randomly chosen eye, whereas the fellow eye will receive placebo. Measurements of tear film thickness will be performed with optical coherence tomography (OCT) before instillation and 10 minutes, 1 hour, 2 hours, 4 hours, 8 hours, 10 hours, 12 hours and 24 hours after instillation. In addition, ocular scattering of the tear film will be assessed with an Optical Quality Analysis System (OQAS) at the same timepoints. Determination of break up time (BUT) will be performed before and after instillation of the eye drops.

In Cohort II, chitosan-N-acetylcysteine eye drops will be instilled once daily in one eye and b.i.d. in the fellow eye on five consecutive days. Measurements of tear film thickness with OCT and OQAS will be performed every study day before the morning instillation and the day after the last instillation. Additionally, patients will be asked to answer the ocular surface disease index (OSDI©) on day 1 and day 6. BUT will be determined before and after instillation of the eye drops.

Study Overview

• Status: Completed
• Conditions: Dry Eye Syndrome
• Intervention / Treatment: Drug: Placebo; Drug: Chitosan- N- Acetylcysteine eye drops

• Study Type: Interventional
• Enrollment (Actual): 32
• Phase: Phase 2

Contacts and Locations

Study Locations

• Austria
  • Vienna, Austria, 1090
    • Medical University of Vienna, Department of Clinical Pharmacology

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Men and women aged over 18 years
• History of dry eye syndrome for at least 3 months
• At least two of the following three criteria must apply: - Tear Break Up Time (BUT) < 10 seconds and/or - Schirmer I test < 7 mm and/or - at least 2 symptoms of dry eye syndrome (foreign body sensation, burning, photophobia, blurred vision, pain, itching)
• Normal ophthalmic findings except dry eye syndrome, ametropia < 6 Dpt.
• No administration of topical lubricants 24 hours before the screening examination

Exclusion Criteria:

• Participation in a clinical trial in the 3 weeks preceding the screening visit
• Symptoms of a clinically relevant illness other than dry eye in the 3 weeks before the first study day
• Presence or history of a severe medical condition as judged by the clinical investigator
• Intake of parasympathomimetic or anti-psychotic drugs
• Diagnosis of severe dry eye by Schirmer I test < 2mm
• Difference in BUT between the two eyes of more than 4 seconds
• Wearing of contact lenses
• Glaucoma
• Treatment with corticosteroids in the 4 weeks preceding the study
• Topical treatment with any ophthalmic drug except topical lubricants in the 4 weeks preceding the study
• Ocular infection or clinically significant inflammation
• Ocular surgery in the 3 months preceding the study
• Sjögren's syndrome
• Stevens-Johnson syndrome
• History of allergic conjunctivitis
• Ametropia ≥ 6 Dpt
• Pregnancy, planned pregnancy or lactating

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: Randomized
• Interventional Model: Single Group Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Chitosan-N-acetylcystein; Instillation into the study eye	Drug: Chitosan- N- Acetylcysteine eye drops
Placebo Comparator: Placebo; Instillation into the fellow eye	Drug: Placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Tear Film thickness as measured with OCT - Cohort I		Before, 10 minutes (± 3 minutes), 1 hour (± 10 minutes), 2 hours (± 10minutes), 4 hours (± 10 minutes), 8 hours (± 20 minutes) 10 hours (± 20 minutes) and 12 hours (± 20 minutes) after instillation
Tear Film thickness as measured with OCT - Cohort II	Tear film thickness will be assessed on 6 consecutive study days	change from baseline to after 6 days

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
OSI (Objective Scattering Index) - Cohort I		Before, 10 minutes (± 3 minutes), 1 hour (± 10 minutes), 2 hours (± 10minutes), 4 hours (± 10 minutes), 8 hours (± 20 minutes) 10 hours (± 20 minutes) and 12 hours (± 20 minutes) after instillation
OSI (Objective Scattering Index) - Cohort II	OSI will be assessed on 6 consecutive study days	change from baseline to after 6 days

Collaborators and Investigators

• Sponsor: Gerhard Garhofer
• Collaborators: Croma-Pharma GmbH

Study record dates

Study Major Dates

• Study Start: September 1, 2012
• Primary Completion (Actual): March 1, 2013
• Study Completion (Actual): March 1, 2013

Study Registration Dates

• First Submitted: December 7, 2012
• First Submitted That Met QC Criteria: December 17, 2012
• First Posted (Estimate): December 20, 2012

Study Record Updates

• Last Update Posted (Estimate): April 5, 2013
• Last Update Submitted That Met QC Criteria: April 4, 2013
• Last Verified: April 1, 2013

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pathologic Processes; Eye Diseases; Disease; Lacrimal Apparatus Diseases; Keratoconjunctivitis; Conjunctivitis; Conjunctival Diseases; Keratitis; Corneal Diseases; Syndrome; Dry Eye Syndromes; Keratoconjunctivitis Sicca; Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Anti-Infective Agents; Antiviral Agents; Antimetabolites; Protective Agents; Anticholesteremic Agents; Hypolipidemic Agents; Lipid Regulating Agents; Respiratory System Agents; Hemostatics; Coagulants; Antioxidants; Antidotes; Pharmaceutical Solutions; Chelating Agents; Sequestering Agents; Free Radical Scavengers; Expectorants; Ophthalmic Solutions; Acetylcysteine; N-monoacetylcystine; Chitosan
• Other Study ID Numbers: OPHT291211