Ischemia-Reperfusion InjuryNCT00184847
Adenosine Receptors Influence Ischemia-Reperfusion Injury
A study testing acetylcholine, twenty minutes of forearm ischemia and three 5-minute periods of forearm ischemia in people with Ischemia-Reperfusion Injury, run by Radboud University Medical Center at 1 site in Netherlands.
Trial summary
Ischemic preconditioning is defined as the development of tolerance to ischemia-reperfusion injury by a previous short bout of ischemia resulting in a marked reduction in infarct size. This mechanism can be mimicked by several pharmacological substances such as acetylcholine and adenosine. Read more about this study
- Who is it for?
- Ages 18 to 50 yearsHealthy volunteers can take part
- Conditions the study is for
- Ischemia-Reperfusion Injury
- What is being tested?
- acetylcholine, twenty minutes of forearm ischemia and three 5-minute periods of forearm ischemia
- Type of treatment
- Surgery or procedure
- How many people
- 8 participants
- Where
- 1 siteNetherlands
- Study dates
- Mar 2005to not given
- Phase
- Interventional
- 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 18 to 50 years
- All sexes
- Healthy volunteers accepted
- Adult
Who may be able to join
- Healthy volunteers
Who cannot join
None listed.
Trial locations and contacts
1 site in 1 country.
Netherlands1 site
Radboud University Nijmegen Medical Centre/Department of Pharmacology and Toxicology
Nijmegen, Gelderland, 6500 HB
About this study
Official title: Adenosine Receptor Involvement in Acute Ischemic Preconditioning of the Vascular Endothelium
Ischemic preconditioning is defined as the development of tolerance to ischemia-reperfusion injury by a previous short bout of ischemia resulting in a marked reduction in infarct size. This mechanism can be mimicked by several pharmacological substances such as acetylcholine and adenosine.
To detect ischemia-reperfusion injury in humans in vivo Kharbanda et al. developed a method in which endothelial dysfunction represents the effects of ischemic preconditioning. This method, however, uses acetylcholine to measure endothelial function before and after forearm ischemia. We, the investigators at Radboud University, hypothesize that the use of acetylcholine in this model reduces ischemia-reperfusion injury. Therefore, we will compare this protocol with a protocol in which endothelial function is only measured after ischemia. We expect an increase in ischemia-reperfusion injury when endothelial function is only measured after the forearm ischemia.
After determining the optimal method to measure ischemia-reperfusion injury of the vascular endothelium we will determine the effect of acute and chronic caffeine, an adenosine receptor antagonist, on ischemic preconditioning. With this study we expect to find that adenosine mimics ischemic preconditioning of the vascular endothelium. Moreover, we expect to find that acute caffeine intake reduces ischemia-reperfusion injury whereas chronic caffeine intake does not. This study will increase our knowledge about the mechanism of ischemic preconditioning and may also provide leads to exploit this endogenous protective mechanism in a clinical setting.
- Conditions
- Ischemia-Reperfusion Injury
- Being tested
- acetylcholine, twenty minutes of forearm ischemia, three 5-minute periods of forearm ischemia, adenosine, caffeine
- Keywords
- acetylcholine, adenosine, caffeine, ischemic preconditioning
- Medical subject headings
- Reperfusion Injury
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
acetylcholineDrug
twenty minutes of forearm ischemiaProcedure or surgery
three 5-minute periods of forearm ischemiaProcedure or surgery
adenosineDrug
caffeineDrug
What is being measured
The primary outcome is the main question the study is designed to answer.
Percentual increase in forearm blood flow ratio to three increment dosages of acetylcholine before forearm ischemia and within two hours after forearm ischemia
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted16 Sep 2005 (estimated)
- Study startMar 2005
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Ischemia-Reperfusion InjuryStudies of the same condition, open and under way.
- More trials run by Radboud University Medical CenterThe 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 N/A
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Double blind
- Enrolment
- 8 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Radboud University Medical Center
- Sponsor type
- University, hospital or other
- Investigators
- Gerard Rongen, MD, PhD, Principal investigator, Radboud University Nijmegen Medical Centre/Department of Pharmacology and Toxicology
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00184847
- Sponsor's protocol ID
- ACAD
- Status last verified
- Mar 2008
- First submitted
- 12 Sep 2005
- Last updated
- 28 Mar 2008
- Results posted
- No
Publications
Kharbanda RK, Peters M, Walton B, Kattenhorn M, Mullen M, Klein N, Vallance P, Deanfield J, MacAllister R. Ischemic preconditioning prevents endothelial injury and systemic neutrophil activation during ischemia-reperfusion in humans in vivo. Circulation. 2001 Mar 27;103(12):1624-30. doi: 10.1161/01.cir.103.12.1624.
PubMed 11273988
Study at a glance
From the registry record, last updated by the sponsor on 28 Mar 2008. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Adenosine Receptor Involvement in Acute Ischemic Preconditioning of the Vascular Endothelium
- ClinicalTrials.gov ID
- NCT00184847
- Acronym / sponsor ID
- ACAD
- Conditions
- Ischemia-Reperfusion Injury
- Keywords
- acetylcholine, adenosine, caffeine, ischemic preconditioning
- Study type
- Interventional
- Recruitment status
- Suspended
- Enrolment
- 8 participants (estimated)
- Lead sponsor
- Radboud University Medical CenterUniversity, hospital or other
- Study start
- Mar 2005
- First posted
- 16 Sep 2005 (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.
Ischemic preconditioning is defined as the development of tolerance to ischemia-reperfusion injury by a previous short bout of ischemia resulting in a marked reduction in infarct size. This mechanism can be mimicked by several pharmacological substances such as acetylcholine and adenosine.
To detect ischemia-reperfusion injury in humans in vivo Kharbanda et al. developed a method in which endothelial dysfunction represents the effects of ischemic preconditioning. This method, however, uses acetylcholine to measure endothelial function before and after forearm ischemia. We, the investigators at Radboud University, hypothesize that the use of acetylcholine in this model reduces ischemia-reperfusion injury. Therefore, we will compare this protocol with a protocol in which endothelial function is only measured after ischemia. We expect an increase in ischemia-reperfusion injury when endothelial function is only measured after the forearm ischemia.
After determining the optimal method to measure ischemia-reperfusion injury of the vascular endothelium we will determine the effect of acute and chronic caffeine, an adenosine receptor antagonist, on ischemic preconditioning. With this study we expect to find that adenosine mimics ischemic preconditioning of the vascular endothelium. Moreover, we expect to find that acute caffeine intake reduces ischemia-reperfusion injury whereas chronic caffeine intake does not. This study will increase our knowledge about the mechanism of ischemic preconditioning and may also provide leads to exploit this endogenous protective mechanism in a clinical setting.
Study design
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Double blind
Who may qualify
- Ages
- 18 to 50 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (1 listed)
- Healthy volunteers
Key exclusion criteria (0 listed)
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 |
|---|---|---|
| acetylcholine | Drug | – |
| twenty minutes of forearm ischemia | Procedure or surgery | – |
| three 5-minute periods of forearm ischemia | Procedure or surgery | – |
| adenosine | Drug | – |
| caffeine | Drug | – |
Primary outcome
Percentual increase in forearm blood flow ratio to three increment dosages of acetylcholine before forearm ischemia and within two hours after forearm ischemia
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 28 Mar 2008.
- Background: PubMed 11273988Kharbanda RK, Peters M, Walton B, Kattenhorn M, Mullen M, Klein N, Vallance P, Deanfield J, MacAllister R. Ischemic preconditioning prevents endothelial injury and systemic neutrophil activation during ischemia-reperfusion in humans in vivo. Circulation. 2001 Mar 27;103(12):1624-30. doi: 10.1161/01.cir.103.12.1624.
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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.
Gerard Rongen, MD, PhD principal investigator
Radboud University Nijmegen Medical Centre/Department of Pharmacology and Toxicology
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing acetylcholine, twenty minutes of forearm ischemia and three 5-minute periods of forearm ischemia in people with Ischemia-Reperfusion Injury, run by Radboud University Medical Center at 1 site in Netherlands.
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 1 inclusion and 0 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: paused, as of the sponsor's last update on 28 Mar 2008. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Netherlands. Whether a site is taking part right now should be confirmed with that site. See every site.
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.
Are results available for this study?
Results are not available in the source record.
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?
Percentual increase in forearm blood flow ratio to three increment dosages of acetylcholine before forearm ischemia and within two hours after forearm ischemia. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00184847, which also lists 1 linked publication.
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 28 Mar 2008.