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Does Caffeine Reduce Dipyridamole-Induced Protection Against Ischemia-Reperfusion Injury?

This study has been completed.
Information provided by:
Radboud University Identifier:
First received: January 31, 2007
Last updated: July 28, 2008
Last verified: July 2008
The purpose of this project is to explore the interaction between caffeine and dipyridamole on ischemia-reperfusion injury in the forearm.

Condition Intervention Phase
Cardiovascular Disease
Ischemia-Reperfusion Injury
Drug: Dipyridamole
Drug: caffeine
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Does Caffeine Reduce Dipyridamole-Induced Protection Against Ischemia-Reperfusion Injury?

Resource links provided by NLM:

Further study details as provided by Radboud University:

Primary Outcome Measures:
  • Percentage difference in Annexin A5 targetting between experimental and control thenar muscle at 60 and 240 minutes after reperfusion [ Time Frame: 60 and 240 minutes after ischemic exercise ]

Secondary Outcome Measures:
  • Plasma dipyridamole concentration [ Time Frame: at the morning of day 7 of treatment with dipyridamole/placebo ]
  • ENT transport activity (before and after treatment with dipyridamole 200mg, twice daily, for seven days) [ Time Frame: before start of treatment (dipyridamol/placebo) and in the morning of day 7 of treatment (placebo/dipyridamol) ]
  • Workload (duration of exercise and developed force) [ Time Frame: during 10 minutes of ischemic exercise ]

Enrollment: 20
Study Start Date: January 2007
Study Completion Date: April 2007
Primary Completion Date: March 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: 1
dipyridamol during 7 days and before ischemic exercise caffeine 4mg/kg
Drug: Dipyridamole
Dipyridamole 2x200mg 7day per os
Other Name: persatin
Drug: caffeine
caffeine 4mg/kg iv
Other Name: n.a.
Placebo Comparator: 2
dipyridamol during 7 days and before ischemic exercise placebo
Drug: Dipyridamole
Dipyridamole 2x200mg 7day per os
Other Name: persatin

Detailed Description:
Dipyridamole has been proven to reduce targeting of Annexin A5 in responses to ischemic exercise, indicating protection against ischemia-reperfusion injury in humans (pharmacological preconditioning). Dipyridamole increases the endogenous adenosine level by inhibition of the nucleoside transporter (ENT-1). Activation of the adenosine receptor protects against ischemia-reperfusion injury. We hypothesize that endogenous adenosine mediates the protective effect of dipyridamole against ischemia-reperfusion injury. Therefore the adenosine receptor antagonist caffeine will reduce the benefit of dipyridamole on forearm ischemia-reperfusion injury.

Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Male
  • Age between 18-50yr.

Exclusion Criteria:

  • cardiovascular disease
  • hypertension (systole > 140 mmHg, diastole > 90 mmHg)
  • hypercholesterolemia (random total cholesterol > 6.5 mmol/l)
  • diabetes mellitus (fasting glucose > 7.0 mmol/L or random glucose > 11.0 mmol/L)
  • asthma (recurrent episodes of dyspnea and wheezing, or usage of prescribed inhalation medication: i.e. corticosteroids or B2-agonists)
  • participation in any clinical trial during the last 60 days prior to this study.
  • administration of two doses of Annexin A5 (0,1mg; 450MBq) during the last 5 years prior to this study.
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Please refer to this study by its identifier: NCT00430170

Radboud University Nijmegen Medical Centre
Nijmegen, Netherlands, 6500hb
Sponsors and Collaborators
Radboud University
Principal Investigator: Gerard Rongen, MD PhD Radboud University
  More Information

Responsible Party: G Rongen, dept Pharmacology Toxicology Identifier: NCT00430170     History of Changes
Other Study ID Numbers: dipy001
Study First Received: January 31, 2007
Last Updated: July 28, 2008

Keywords provided by Radboud University:
ischemia-reperfusion injury

Additional relevant MeSH terms:
Wounds and Injuries
Cardiovascular Diseases
Reperfusion Injury
Pathologic Processes
Vascular Diseases
Postoperative Complications
Phosphodiesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Platelet Aggregation Inhibitors
Vasodilator Agents
Central Nervous System Stimulants
Physiological Effects of Drugs
Purinergic P1 Receptor Antagonists
Purinergic Antagonists
Purinergic Agents
Neurotransmitter Agents processed this record on April 28, 2017