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Effects of Indomethacin on Retinal and Choroidal Blood Flow in Healthy Volunteers

This study has been completed.
Information provided by:
Medical University of Vienna Identifier:
First received: January 11, 2006
Last updated: February 9, 2007
Last verified: February 2007

Prostaglandins (PG) are known to alter regional ocular blood flow and exhibit vasoactive properties in isolated ocular blood vessels. A variety of animal experiments indicate that endogenous PGs play a role in the regulation of retinal (RBF) and choroidal (ChBF) blood flow. There is also evidence that the prostaglandin pathway is involved in the activation of NO production in humans, however, the mechanisms for interactions between PG and NO in ocular vasculature are still unclear.

Animal studies suggest that retinal and choroidal blood flow decrease after administration of indomethacin (a nonspecific cyclooxygenase inhibitor). More recently, it has been shown that indomethacin injected intravenously decreased optic nerve oxygen tension and reduced the CO2 reactivity. This is probably the result of decreased blood flow through vasoconstriction of vessels in the optic nerve. Systemic administration of indomethacin also diminishes cerebral, renal and mesenteric blood flow by an unknown mechanism. However, no clinical trials exist so far investigating the effects of indomethacin on ocular blood flow. Therefore, the aim of this study is to investigate the effect of indomethacin on ocular blood flow in healthy humans.

Condition Intervention
Ocular Physiology
Regional Blood Flow
Drug: indometacine (drug) effect on ocular blood flow

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double-Blind
Official Title: Effects of Indomethacin on Retinal and Choroidal Blood Flow in Healthy Volunteers

Resource links provided by NLM:

Further study details as provided by Medical University of Vienna:

Primary Outcome Measures:
  • Retinal and choroidal blood flow

Estimated Enrollment: 12
Study Start Date: January 2006
Estimated Study Completion Date: August 2006

Ages Eligible for Study:   18 Years to 35 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Men aged between 18 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.

Exclusion Criteria:

  • 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 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
  • Ametropy less than 3 dpt
  Contacts and Locations
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Please refer to this study by its identifier: NCT00275730

Department of Clinical Pharmacology
Vienna, Austria, 1090
Sponsors and Collaborators
Medical University of Vienna
Principal Investigator: Gabriele Fuchsjaeger-Mayrl, MD Department of Clinical Pharmacology, Medical University of Vienna
  More Information Identifier: NCT00275730     History of Changes
Other Study ID Numbers: 9-11-2004
Study First Received: January 11, 2006
Last Updated: February 9, 2007

Keywords provided by Medical University of Vienna:
retinal blood flow
choroidal blood flow

Additional relevant MeSH terms:
Anti-Inflammatory Agents, Non-Steroidal
Analgesics, Non-Narcotic
Sensory System Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Anti-Inflammatory Agents
Antirheumatic Agents
Gout Suppressants
Tocolytic Agents
Reproductive Control Agents
Cyclooxygenase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action processed this record on April 28, 2017