Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
46 participants
OBSERVATIONAL
2016-11-30
2018-09-30
Brief Summary
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Detailed Description
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The research aims are:
1. To determine the effect of age and sex on baseline cerebral blood flow through the middle cerebral artery (MCA).
2. To determine the effect of age and sex on cerebral vasodilator responses.
3. To determine if the cerebrovascular responses measured by transcranial Doppler ultrasound (TCD) are associated with the cerebrovascular responses measured by Magnetic Resonance (MR) imaging.
Conditions
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Keywords
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Study Design
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CASE_CONTROL
PROSPECTIVE
Study Groups
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Healthy young women
Healthy young women between the age of 20-34 years.
MRI
Participants will undergo a MRI scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory rate and PetCO2 will be measured.
TCD
Participants will undergo a TCD scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory and PetCO2 will be measured.
Healthy young men
Healthy young men between the age of 20-34 years.
MRI
Participants will undergo a MRI scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory rate and PetCO2 will be measured.
TCD
Participants will undergo a TCD scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory and PetCO2 will be measured.
Healthy older women
Healthy older women between the age of 50-64 years.
MRI
Participants will undergo a MRI scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory rate and PetCO2 will be measured.
TCD
Participants will undergo a TCD scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory and PetCO2 will be measured.
Healthy older men
Healthy older men between the age of 50-64 years.
MRI
Participants will undergo a MRI scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory rate and PetCO2 will be measured.
TCD
Participants will undergo a TCD scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory and PetCO2 will be measured.
Interventions
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MRI
Participants will undergo a MRI scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory rate and PetCO2 will be measured.
TCD
Participants will undergo a TCD scan while two stepwise CO2 elevations are applied to the participant by adding fractional concentration of inspired CO2 (FICO2) at 4% and 6% each time. The end tidal CO2 (PetCO2) will be elevated and maintained constant for a few minutes at each target level. Breath-by-breath changes in respiratory and PetCO2 will be measured.
Other Intervention Names
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Eligibility Criteria
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Inclusion Criteria
* Body mass index \<34 kg/m2
Exclusion Criteria
* History or evidence of: hepatic disease, renal disease, hematological disease, peripheral vascular disease, stroke/neurovascular disease, diabetes, hypertension
* Part of a vulnerable population (e.g. pregnant women, prisoner, individuals lacking capacity to consent, etc.)
* Older females only: subject is not post-menopausal
20 Years
64 Years
ALL
Yes
Sponsors
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University of Wisconsin, Madison
OTHER
Responsible Party
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Principal Investigators
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Jill N Barnes, PhD
Role: PRINCIPAL_INVESTIGATOR
University of Wisconsin, Madison
Locations
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University of Wisconsin-Madison
Madison, Wisconsin, United States
Countries
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References
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Selim M, Jones R, Novak P, Zhao P, Novak V. The effects of body mass index on cerebral blood flow velocity. Clin Auton Res. 2008 Dec;18(6):331-8. doi: 10.1007/s10286-008-0490-z. Epub 2008 Aug 22.
Dandona P, James IM, Newbury PA, Woollard ML, Beckett AG. Cerebral blood flow in diabetes mellitus: evidence of abnormal cerebrovascular reactivity. Br Med J. 1978 Jul 29;2(6133):325-6. doi: 10.1136/bmj.2.6133.325.
Barnes JN, Schmidt JE, Nicholson WT, Joyner MJ. Cyclooxygenase inhibition abolishes age-related differences in cerebral vasodilator responses to hypercapnia. J Appl Physiol (1985). 2012 Jun;112(11):1884-90. doi: 10.1152/japplphysiol.01270.2011. Epub 2012 Mar 22.
Lipsitz LA, Mukai S, Hamner J, Gagnon M, Babikian V. Dynamic regulation of middle cerebral artery blood flow velocity in aging and hypertension. Stroke. 2000 Aug;31(8):1897-903. doi: 10.1161/01.str.31.8.1897.
Kearney-Schwartz A, Rossignol P, Bracard S, Felblinger J, Fay R, Boivin JM, Lecompte T, Lacolley P, Benetos A, Zannad F. Vascular structure and function is correlated to cognitive performance and white matter hyperintensities in older hypertensive patients with subjective memory complaints. Stroke. 2009 Apr;40(4):1229-36. doi: 10.1161/STROKEAHA.108.532853. Epub 2009 Feb 26.
Smith EE, Greenberg SM. Beta-amyloid, blood vessels, and brain function. Stroke. 2009 Jul;40(7):2601-6. doi: 10.1161/STROKEAHA.108.536839. Epub 2009 May 14.
Celermajer DS, Sorensen KE, Bull C, Robinson J, Deanfield JE. Endothelium-dependent dilation in the systemic arteries of asymptomatic subjects relates to coronary risk factors and their interaction. J Am Coll Cardiol. 1994 Nov 15;24(6):1468-74. doi: 10.1016/0735-1097(94)90141-4.
Panza JA, Quyyumi AA, Brush JE Jr, Epstein SE. Abnormal endothelium-dependent vascular relaxation in patients with essential hypertension. N Engl J Med. 1990 Jul 5;323(1):22-7. doi: 10.1056/NEJM199007053230105.
Kugiyama K, Kerns SA, Morrisett JD, Roberts R, Henry PD. Impairment of endothelium-dependent arterial relaxation by lysolecithin in modified low-density lipoproteins. Nature. 1990 Mar 8;344(6262):160-2. doi: 10.1038/344160a0.
Luscher TF, Diederich D, Siebenmann R, Lehmann K, Stulz P, von Segesser L, Yang ZH, Turina M, Gradel E, Weber E, et al. Difference between endothelium-dependent relaxation in arterial and in venous coronary bypass grafts. N Engl J Med. 1988 Aug 25;319(8):462-7. doi: 10.1056/NEJM198808253190802.
Mitchell GF, van Buchem MA, Sigurdsson S, Gotal JD, Jonsdottir MK, Kjartansson O, Garcia M, Aspelund T, Harris TB, Gudnason V, Launer LJ. Arterial stiffness, pressure and flow pulsatility and brain structure and function: the Age, Gene/Environment Susceptibility--Reykjavik study. Brain. 2011 Nov;134(Pt 11):3398-407. doi: 10.1093/brain/awr253.
Ide K, Eliasziw M, Poulin MJ. Relationship between middle cerebral artery blood velocity and end-tidal PCO2 in the hypocapnic-hypercapnic range in humans. J Appl Physiol (1985). 2003 Jul;95(1):129-37. doi: 10.1152/japplphysiol.01186.2002.
Ivancev V, Bakovic D, Obad A, Breskovic T, Palada I, Joyner MJ, Dujic Z. Effects of indomethacin on cerebrovascular response to hypercapnea and hypocapnea in breath-hold diving and obstructive sleep apnea. Respir Physiol Neurobiol. 2009 May 15;166(3):152-8. doi: 10.1016/j.resp.2009.03.001. Epub 2009 Mar 18.
Xie A, Skatrud JB, Morgan B, Chenuel B, Khayat R, Reichmuth K, Lin J, Dempsey JA. Influence of cerebrovascular function on the hypercapnic ventilatory response in healthy humans. J Physiol. 2006 Nov 15;577(Pt 1):319-29. doi: 10.1113/jphysiol.2006.110627. Epub 2006 Aug 24.
Mendelsohn ME, Karas RH. The protective effects of estrogen on the cardiovascular system. N Engl J Med. 1999 Jun 10;340(23):1801-11. doi: 10.1056/NEJM199906103402306. No abstract available.
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Coverdale NS, Badrov MB, Shoemaker JK. Impact of age on cerebrovascular dilation versus reactivity to hypercapnia. J Cereb Blood Flow Metab. 2017 Jan;37(1):344-355. doi: 10.1177/0271678X15626156. Epub 2016 Jan 12.
Miller KB, Howery AJ, Rivera-Rivera LA, Johnson SC, Rowley HA, Wieben O, Barnes JN. Age-Related Reductions in Cerebrovascular Reactivity Using 4D Flow MRI. Front Aging Neurosci. 2019 Oct 17;11:281. doi: 10.3389/fnagi.2019.00281. eCollection 2019.
Other Identifiers
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A176000
Identifier Type: OTHER
Identifier Source: secondary_id
EDUC/KINESIOLOGY/KINESIO
Identifier Type: OTHER
Identifier Source: secondary_id
2016-0403
Identifier Type: -
Identifier Source: org_study_id