PhysiologyPhase 4NCT00279253
Effects of Intravenous Clonidine on Ocular Blood Flow and Intraocular Pressure
A Phase 4 study testing clonidine (drug) intravenously in people with Physiology, run by Medical University of Vienna.
Trial summary
Background Clonidine, a derivate of Imidazol, is an antihypertensive drug. It acts by stimulating adrenergic receptors on nerves in the brain and Imidazol-receptors. As a result, clonidine slows the heart rate and reduces blood pressure. Read more about this study
- Who is it for?
- Ages 19 to 35 years, men onlyHealthy volunteers can take part
- Conditions the study is for
- Physiology
- What is being tested?
- clonidine (drug) intravenously
- Type of treatment
- Injection or infusion
- How many people
- 12 participants
- Where
- No sites listed yet
- Study dates
- Mar 2004to Jan 2005
- Phase
- Phase 4
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 19 to 35 years
- Men only
- Healthy volunteers accepted
- Adult
Who may be able to join
- Men aged between 19 and 35 years, nonsmokers
- Body mass index between 15th and 85th percentile
- Normal findings in the medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant
- Normal laboratory values unless the investigator considers an abnormality to be clinically irrelevant
- Normal ophthalmic findings, ametropy < 3 Dpt.
Who cannot join
- Regular use of medication, abuse of alcoholic beverages, participation in a clinical trial in the 3 weeks preceding the study
- Treatment in the previous 3 weeks with any drug
- Symptoms of a clinically relevant illness in the 3 weeks before the first study day
- History of hypersensitivity to the trial drug or to drugs with a similar chemical structure
- History or presence of gastrointestinal, liver or kidney disease, or other conditions known to interfere with, distribution, metabolism or excretion of study drugs
- Blood donation during the previous 3 weeks
- History or family history of epilepsy
About this study
Background Clonidine, a derivate of Imidazol, is an antihypertensive drug. It acts by stimulating adrenergic receptors on nerves in the brain and Imidazol-receptors. As a result, clonidine slows the heart rate and reduces blood pressure. Clonidine was approved by the FDA in 1974 and is registered in Austria with the brand name "Catapresan".
Alpha2 adrenergic agonists are nowadays used topically as eye drops in glaucoma treatment. In addition to their known effect of lowering intraocular pressure, alpha2 adrenoceptor agonists are neuroprotective. Brimonidine, which is the most commonly used topical alpha-2 agonist, is currently on the market for treatment of glaucoma and is effective in reducing intraocular pressure. It has, however, been shown that brimonidine is a very potent vasoconstrictor in the ciliary body thus reducing aqueous humor production. Little is, however, known about potential vasoconstrictor effects of brimonidine in the posterior pole of the eye. This is of clinical importance, because optic nerve head ischemia appears to contribute to glaucoma pathophysiology. Direct investigation of the ocular hemodynamic effects of brimonidine is, however, difficult, because lowering intraocular pressure with brimonidine may confound the results due to the concomitant change in ocular perfusion pressure.
Read more
The aim of the present study is to assess the effect of intravenous clonidine as model drug of alpha agonists on ocular blood flow and IOP in healthy humans.
Study objectives:
To investigate effects of clonidine on ocular blood flow and intraocular pressure.
- Conditions
- Physiology
- Being tested
- clonidine (drug) intravenously
- Keywords
- clonidine, glaucoma
- Medical subject headings
- Glaucoma
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
clonidine (drug) intravenouslyDrug
What is being measured
The primary outcome is the main question the study is designed to answer.
ocular blood flow
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted19 Jan 2006 (estimated)
- Study startMar 2004
- Study completionJan 2005
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for PhysiologyStudies of the same condition, open and under way.
- More trials run by Medical University of ViennaThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 4
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Double blind
- Enrolment
- 12 participants
Sponsor and investigators
- Lead sponsor
- Medical University of Vienna
- Sponsor type
- University, hospital or other
- Investigators
- Gabriele Fuchsjaeger-Mayrl, MD, Principal investigator, Department of Clinical Pharmacology
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00279253
- Sponsor's protocol ID
- OPHT-141003
- Status last verified
- Jan 2006
- First submitted
- 18 Jan 2006
- Last updated
- 19 Jan 2006
- Results posted
- No
Study at a glance
From the registry record, last updated by the sponsor on 19 Jan 2006. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effects of Intravenous Clonidine on Ocular Blood Flow and Intraocular Pressure
- ClinicalTrials.gov ID
- NCT00279253
- Acronym / sponsor ID
- OPHT-141003
- Conditions
- Physiology
- Keywords
- clonidine, glaucoma
- Phase
- Phase 4
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 12 participants
- Lead sponsor
- Medical University of ViennaUniversity, hospital or other
- Study start
- Mar 2004
- Study completion
- Jan 2005
- First posted
- 19 Jan 2006 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Background Clonidine, a derivate of Imidazol, is an antihypertensive drug. It acts by stimulating adrenergic receptors on nerves in the brain and Imidazol-receptors. As a result, clonidine slows the heart rate and reduces blood pressure. Clonidine was approved by the FDA in 1974 and is registered in Austria with the brand name "Catapresan".
Alpha2 adrenergic agonists are nowadays used topically as eye drops in glaucoma treatment. In addition to their known effect of lowering intraocular pressure, alpha2 adrenoceptor agonists are neuroprotective. Brimonidine, which is the most commonly used topical alpha-2 agonist, is currently on the market for treatment of glaucoma and is effective in reducing intraocular pressure. It has, however, been shown that brimonidine is a very potent vasoconstrictor in the ciliary body thus reducing aqueous humor production. Little is, however, known about potential vasoconstrictor effects of brimonidine in the posterior pole of the eye. This is of clinical importance, because optic nerve head ischemia appears to contribute to glaucoma pathophysiology. Direct investigation of the ocular hemodynamic effects of brimonidine is, however, difficult, because lowering intraocular pressure with brimonidine may confound the results due to the concomitant change in ocular perfusion pressure.
The aim of the present study is to assess the effect of intravenous clonidine as model drug of alpha agonists on ocular blood flow and IOP in healthy humans.
Study objectives:
To investigate effects of clonidine on ocular blood flow and intraocular pressure.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Double blind
Who may qualify
- Ages
- 19 to 35 years
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (5 listed)
- Men aged between 19 and 35 years, nonsmokers
- Body mass index between 15th and 85th percentile
- Normal findings in the medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant
- Normal laboratory values unless the investigator considers an abnormality to be clinically irrelevant
- Normal ophthalmic findings, ametropy < 3 Dpt.
Key exclusion criteria (7 listed)
- Regular use of medication, abuse of alcoholic beverages, participation in a clinical trial in the 3 weeks preceding the study
- Treatment in the previous 3 weeks with any drug
- Symptoms of a clinically relevant illness in the 3 weeks before the first study day
- History of hypersensitivity to the trial drug or to drugs with a similar chemical structure
- History or presence of gastrointestinal, liver or kidney disease, or other conditions known to interfere with, distribution, metabolism or excretion of study drugs
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| clonidine (drug) intravenously | Drug | – |
Primary outcome
ocular blood flow
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 19 Jan 2006.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Gabriele Fuchsjaeger-Mayrl, MD principal investigator
Department of Clinical Pharmacology
Questions about this trial
What is this clinical trial studying?
A Phase 4 study testing clonidine (drug) intravenously in people with Physiology, run by Medical University of Vienna.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 7 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 19 Jan 2006. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 4 studies take place after a treatment is approved, to learn more about its long-term benefits and risks in everyday use.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
ocular blood flow. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 19 Jan 2006.