HealthyNCT00006318
Role of Prostaglandins in the Regulation of Brain Blood Flow
An observational study of Healthy and Hypercapnia, run by National Institutes of Health Clinical Center (CC) at 1 site in United States.
Trial summary
This study will use magnetic resonance imaging (MRI) to examine the role of prostaglandins-a type of fatty acid with hormone-like actions-in the regulation of brain blood flow. The results will provide information on how to better use this technique to study brain function, which, in turn, may lead to a better… Read more about this study
- Who is it for?
- Any ageHealthy volunteers can take part
- Conditions the study is for
- Healthy, Hypercapnia
- How many people
- 125 participants
- Where
- 1 siteUnited States
- Study dates
- Sep 2000to Dec 2003
- Phase
- Observational
- 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 Any age
- All sexes
- Healthy volunteers accepted
- Child, Adult, Older adult
Who may be able to join
- Any healthy normal volunteer above the age of 18 who is capable of giving informed consent.
Who cannot join
- Subjects will be excluded for the following reasons.
- They have contraindications to MR scanning, such as the following: aneurysm clip, implanted neural stimulator, implanted cardiac pacemaker or autodefibrillator, cochlear implant, ocular foreign body (e.g., metal shavings), or insulin pump.
- They have panic disorder or migraine (because of possible complications with CO2 inhalation).
- They have cirrhosis, any renal dysfunction, or a chronic respiratory illness (such as asthma).
- They have allergies to sulfonamide drugs or cyclo-oxygenase inhibitors (NSAIDS).
Trial locations and contacts
1 site in 1 country.
United States1 site
Warren G. Magnuson Clinical Center (CC)
Bethesda, Maryland, 20892
About this study
Official title: Role of Prostaglandins in the Control of Cerebral Blood Flow During Hypercapnia and Functional Activation in Humans
This study will use magnetic resonance imaging (MRI) to examine the role of prostaglandins-a type of fatty acid with hormone-like actions-in the regulation of brain blood flow. The results will provide information on how to better use this technique to study brain function, which, in turn, may lead to a better understanding of certain illnesses and more effective treatments.
Healthy normal volunteers 18 years of age and older may be eligible for this study. Participants will fill out a health questionnaire and undergo a history, physical examination and MRI studies. MRI is a diagnostic tool that uses a strong magnetic field and radio waves instead of X-rays to show structural and chemical changes in tissues. During the scanning, the subject lies on a table in a narrow cylinder containing a magnetic field. An intercom system allows the subject to speak with the staff member performing the study at all times during the procedure. Four separate studies will be done-two carbon dioxide inhalation studies and two functional activation studies-as follows:
Read more
Carbon dioxide inhalation (indomethacin): This study is done in two parts. In both parts, an MRI brain scan is done. During the scan, the subject inhales an air mixture containing 6% carbon dioxide through a facemask or mouthpiece. Blood pressure and heart rate are monitored during inhalation of the mixture. For the second part of the study, indomethacin-a non-steroidal anti-inflammatory drug-is injected through a catheter (thin flexible tube) in an arm vein. Indomethacin inhibits prostaglandin production. Total scan time averages between 45 and 90 minutes, with a maximum of 2 hours.
Carbon dioxide inhalation (rofecoxib and celecoxib): This study is identical to the one above, except either rofecoxib or celecoxib is given instead of indomethacin. Both of these drugs are also non-steroidal anti-inflammatory drugs that inhibit prostaglandin production. Unlike indomethacin, rofecoxib and celecoxib are given orally instead of through a vein, so, to allow time for the drug to be absorbed, the second scan is delayed for 2 hours.
Functional activation (indomethacin): This study is done in two parts. In both parts, a MRI brain scan is done. During the study, the subject performs a simple motor task, such as finger tapping. For the second part of the study, indomethacin is injected through a catheter in an arm vein.
Functional activation (rofecoxib and celecoxib): This study is identical to the indomethacin functional activation study, except either rofecoxib or celecoxib is given instead of indomethacin. Because they are given orally instead of through a vein, the second scan is delayed 2 hours to allow time for the drug to be absorbed.
Read the detailed description
Advances in MR perfusion imaging have provided clinical researchers with the opportunity to quantify regional increases in cerebral blood flow. The purpose of this study is to investigate in humans the role of prostaglandins in the regulation of cerebral blood flow during hypercapnia and functional activation. For this investigation the increase in cerebral blood flow associated with either hypercapnia or functional activation will be measured before and after the administration of pharmacological agents that inhibit the production of prostaglandins. In the hypercapnia study cerebral blood flow will be increased by inhalation of an air mixture containing 6% CO2. For the functional activation study cerebral blood flow will be increased by a sensory motor task.
- Conditions
- Healthy, Hypercapnia
- Keywords
- Cerebral Blood Flow, CO2 Inhalation, Imaging, MRI, Perfusion, Functional Activation
- Medical subject headings
- Hypercapnia
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted2 Oct 2000 (estimated)
- Study startSep 2000
- Study completionDec 2003
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (3)Papers the sponsor has linked to this study.
- Other trials for HealthyStudies of the same condition, open and under way.
- 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
- Observational
- Enrolment
- 125 participants
Sponsor and investigators
- Lead sponsor
- National Institutes of Health Clinical Center (CC)
- Sponsor type
- US National Institutes of Health
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00006318
- Sponsor's protocol ID
- 000226
- Other IDs
- 00-CC-0226
- Status last verified
- Dec 2003
- First submitted
- 30 Sep 2000
- Last updated
- 4 Mar 2008
- Results posted
- No
Publications
O'Banion MK. Cyclooxygenase-2: molecular biology, pharmacology, and neurobiology. Crit Rev Neurobiol. 1999;13(1):45-82. doi: 10.1615/critrevneurobiol.v13.i1.30.
PubMed 10223523Kaufmann WE, Worley PF, Pegg J, Bremer M, Isakson P. COX-2, a synaptically induced enzyme, is expressed by excitatory neurons at postsynaptic sites in rat cerebral cortex. Proc Natl Acad Sci U S A. 1996 Mar 19;93(6):2317-21. doi: 10.1073/pnas.93.6.2317.
PubMed 8637870Yamagata K, Andreasson KI, Kaufmann WE, Barnes CA, Worley PF. Expression of a mitogen-inducible cyclooxygenase in brain neurons: regulation by synaptic activity and glucocorticoids. Neuron. 1993 Aug;11(2):371-86. doi: 10.1016/0896-6273(93)90192-t.
PubMed 8352945
Study at a glance
From the registry record, last updated by the sponsor on 4 Mar 2008. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Role of Prostaglandins in the Control of Cerebral Blood Flow During Hypercapnia and Functional Activation in Humans
- ClinicalTrials.gov ID
- NCT00006318
- Acronym / sponsor ID
- 000226
- Conditions
- Healthy, Hypercapnia
- Keywords
- Cerebral Blood Flow, CO2 Inhalation, Imaging, MRI, Perfusion, Functional Activation
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 125 participants
- Lead sponsor
- National Institutes of Health Clinical Center (CC)US National Institutes of Health
- Study start
- Sep 2000
- Study completion
- Dec 2003
- First posted
- 2 Oct 2000 (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.
This study will use magnetic resonance imaging (MRI) to examine the role of prostaglandins-a type of fatty acid with hormone-like actions-in the regulation of brain blood flow. The results will provide information on how to better use this technique to study brain function, which, in turn, may lead to a better understanding of certain illnesses and more effective treatments.
Healthy normal volunteers 18 years of age and older may be eligible for this study. Participants will fill out a health questionnaire and undergo a history, physical examination and MRI studies. MRI is a diagnostic tool that uses a strong magnetic field and radio waves instead of X-rays to show structural and chemical changes in tissues. During the scanning, the subject lies on a table in a narrow cylinder containing a magnetic field. An intercom system allows the subject to speak with the staff member performing the study at all times during the procedure. Four separate studies will be done-two carbon dioxide inhalation studies and two functional activation studies-as follows:
Carbon dioxide inhalation (indomethacin): This study is done in two parts. In both parts, an MRI brain scan is done. During the scan, the subject inhales an air mixture containing 6% carbon dioxide through a facemask or mouthpiece. Blood pressure and heart rate are monitored during inhalation of the mixture. For the second part of the study, indomethacin-a non-steroidal anti-inflammatory drug-is injected through a catheter (thin flexible tube) in an arm vein. Indomethacin inhibits prostaglandin production. Total scan time averages between 45 and 90 minutes, with a maximum of 2 hours.
Carbon dioxide inhalation (rofecoxib and celecoxib): This study is identical to the one above, except either rofecoxib or celecoxib is given instead of indomethacin. Both of these drugs are also non-steroidal anti-inflammatory drugs that inhibit prostaglandin production. Unlike indomethacin, rofecoxib and celecoxib are given orally instead of through a vein, so, to allow time for the drug to be absorbed, the second scan is delayed for 2 hours.
Functional activation (indomethacin): This study is done in two parts. In both parts, a MRI brain scan is done. During the study, the subject performs a simple motor task, such as finger tapping. For the second part of the study, indomethacin is injected through a catheter in an arm vein.
Functional activation (rofecoxib and celecoxib): This study is identical to the indomethacin functional activation study, except either rofecoxib or celecoxib is given instead of indomethacin. Because they are given orally instead of through a vein, the second scan is delayed 2 hours to allow time for the drug to be absorbed.
Detailed description
Advances in MR perfusion imaging have provided clinical researchers with the opportunity to quantify regional increases in cerebral blood flow. The purpose of this study is to investigate in humans the role of prostaglandins in the regulation of cerebral blood flow during hypercapnia and functional activation. For this investigation the increase in cerebral blood flow associated with either hypercapnia or functional activation will be measured before and after the administration of pharmacological agents that inhibit the production of prostaglandins. In the hypercapnia study cerebral blood flow will be increased by inhalation of an air mixture containing 6% CO2. For the functional activation study cerebral blood flow will be increased by a sensory motor task.
Study design
Who may qualify
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (1 listed)
- Any healthy normal volunteer above the age of 18 who is capable of giving informed consent.
Key exclusion criteria (5 listed)
- Subjects will be excluded for the following reasons.
- They have contraindications to MR scanning, such as the following: aneurysm clip, implanted neural stimulator, implanted cardiac pacemaker or autodefibrillator, cochlear implant, ocular foreign body (e.g., metal shavings), or insulin pump.
- They have panic disorder or migraine (because of possible complications with CO2 inhalation).
- They have cirrhosis, any renal dysfunction, or a chronic respiratory illness (such as asthma).
- They have allergies to sulfonamide drugs or cyclo-oxygenase inhibitors (NSAIDS).
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Not reported in the source record.
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 4 Mar 2008.
- Background: PubMed 10223523O'Banion MK. Cyclooxygenase-2: molecular biology, pharmacology, and neurobiology. Crit Rev Neurobiol. 1999;13(1):45-82. doi: 10.1615/critrevneurobiol.v13.i1.30.
- Background: PubMed 8637870Kaufmann WE, Worley PF, Pegg J, Bremer M, Isakson P. COX-2, a synaptically induced enzyme, is expressed by excitatory neurons at postsynaptic sites in rat cerebral cortex. Proc Natl Acad Sci U S A. 1996 Mar 19;93(6):2317-21. doi: 10.1073/pnas.93.6.2317.
- Background: PubMed 8352945Yamagata K, Andreasson KI, Kaufmann WE, Barnes CA, Worley PF. Expression of a mitogen-inducible cyclooxygenase in brain neurons: regulation by synaptic activity and glucocorticoids. Neuron. 1993 Aug;11(2):371-86. doi: 10.1016/0896-6273(93)90192-t.
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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.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Healthy and Hypercapnia, run by National Institutes of Health Clinical Center (CC) at 1 site in United States.
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 5 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 4 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 United States. 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?
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.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00006318, which also lists 3 linked publications.
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 4 Mar 2008.