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Showing 1–24 of 28 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Vasoconstriction Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

The Effect of Antioxidants on Skin Blood Flow-BH4

NCT03680573
View directory record Official record
Conditions
Cardiovascular Diseases, Cardiovascular Risk Factor, Vasoconstriction
Interventions
Control: Lacated Ringers, Apocynin, Allopurinol, BH4, NG Nitro L Arginine Methyl Ester, Sodium Nitroprusside, Acetyl-ß-methylcholine chloride
Drug
Lead sponsor
The University of Texas at Arlington
Other
Eligibility
18 Years to 35 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Arlington, Texas
Source: ClinicalTrials.gov public record
Updated Sep 25, 2018 · Synced Sep 5, 2026, 8:52 AM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

Effects of Iloprost on Hypoxic Pulmonary Vasoconstriction at Altitude

NCT00724321
View directory record Official record
Conditions
Hypoxic Pulmonary Vasoconstriction
Interventions
iloprost
Drug
Lead sponsor
Loma Linda University
Other
Eligibility
18 Years to 80 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Loma Linda, California
Source: ClinicalTrials.gov public record
Updated Sep 17, 2015 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effect of Heat on Blood and Oxygen Flow Readings Part 2

NCT01992939
View directory record Official record
Conditions
Healthy, Peripheral Vascular Disease, Vasoconstriction
Interventions
Specialized pulse oximetry probe with external heat pack, Standard of Care Pulse Oximetry Probe
Other
Lead sponsor
VA Pittsburgh Healthcare System
Federal
Eligibility
18 Years and older
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 1, 2016 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Local Vasoconstriction in Postural Tachycardia Syndrome

NCT01210430
View directory record Official record
Conditions
Postural Tachycardia Syndrome
Interventions
Losartan, Ascorbic Acid (Vitamin C), Normal Saline
Drug
Lead sponsor
New York Medical College
Other
Eligibility
14 Years to 29 Years
Enrollment
74 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Hawthorne, New York
Source: ClinicalTrials.gov public record
Updated Jun 9, 2021 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Phase 4 Interventional Results available

Effect of DPP4 Inhibition on Vasoconstriction

NCT02639637
View directory record Official record
Conditions
Type 2 Diabetes Mellitus
Interventions
Sitagliptin, Placebo, Neuropeptide Y, Enalaprilat, Valsartan 160mg
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 55 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 26, 2018 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Impact of Insulin on Sympathetic Nervous System-mediated Peripheral Vasoconstriction

NCT05244694
View directory record Official record
Conditions
Vasoconstriction, Healthy, Insulin Resistance
Interventions
Insulin
Drug
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years to 45 Years
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Feb 16, 2023 · Synced Sep 5, 2026, 8:52 AM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

Effects of Iloprost on Hypoxic Pulmonary Vasoconstriction and Exercise Capacity at High Altitude

NCT00708565
View directory record Official record
Conditions
Hypoxic Pulmonary Vasoconstriction
Interventions
iloprost
Drug
Lead sponsor
VA Loma Linda Health Care System
Federal
Eligibility
18 Years to 80 Years · Male only
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Loma Linda, California
Source: ClinicalTrials.gov public record
Updated Jul 1, 2008 · Synced Sep 5, 2026, 8:52 AM EDT
Withdrawn Early Phase 1 Interventional Accepts healthy volunteers

Role of Acetylcholine in Blood Flow Regulation in Healthy Adults: Effects of Age and Exercise Training

NCT03972683
View directory record Official record
Conditions
Vasoconstriction, Vasodilation
Interventions
Handgrip Exercise Training, Acetylcholine, Adenosine Triphosphate, Atropine, Phenylephrine, Sodium Nitroprusside
Other · Drug
Lead sponsor
Colorado State University
Other
Eligibility
18 Years to 85 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Aug 1, 2021 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Reflex Responses to Intermittent Hypoxia in Humans: Mechanisms and Consequences

NCT05146089
View directory record Official record
Conditions
Sleep Apnea, Healthy, Vasoconstriction, Vasodilation
Interventions
Hypoxic exposure, modified Oxford test, Oral Bosentan 62.5 mg, Hypoxic ventilatory response test
Other · Drug
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years to 45 Years
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
2
States / cities
Columbia, Missouri • Rochester, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 5, 2021 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Pivotal Bioequivalence Study of Topically Delivered Clobetasol Propionate Lotion in Healthy Adult Subjects

NCT00864500
View directory record Official record
Conditions
Healthy
Interventions
Clobetasol Propionate 0.05% lotion, single exposure, Clobex TM 0.05% Lotion, single exposure
Drug
Lead sponsor
Actavis Inc.
Industry
Eligibility
18 Years to 50 Years · Female only
Enrollment
224 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 8, 2019 · Synced Sep 5, 2026, 8:52 AM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

Study to Improve Scientific Understanding of the Cardiovascular Actions of Cocaine

NCT00338546
View directory record Official record
Conditions
Cocaine Induced Sympathoexciation and Vasoconstriction
Interventions
Cocaine hydrochloride, Dexmedetomidine, Microneurography, Laser doppler velocimetry
Drug · Procedure
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 65 Years
Healthy volunteers
Accepts healthy volunteers
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jan 15, 2019 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Pivotal Bioequivalence Study of Topically Delivered Halobetasol Propionate Ointment in Normal Skin in Healthy Adult Subjects

NCT00865605
View directory record Official record
Conditions
Healthy
Interventions
Halobetasol Propionate 0.05% Ointment, single exposure, Ultravate® 0.05% ointment, single exposure
Drug
Lead sponsor
Actavis Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
71 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2004
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Aug 16, 2010 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Effect of Endothelin and L-Arginine on Racial Differences in Vasoconstriction

NCT03679780
View directory record Official record
Conditions
Cardiovascular Diseases, Cardiovascular Risk Factor, Vasoconstriction
Interventions
BQ-788, BQ-123, L-Arginine, NG Nitro L Arginine Methyl Ester, Sodium Nitroprusside, Lactated Ringer's
Drug
Lead sponsor
The University of Texas at Arlington
Other
Eligibility
18 Years to 35 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2023
U.S. locations
1
States / cities
Arlington, Texas
Source: ClinicalTrials.gov public record
Updated Jun 10, 2024 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Local Antioxidant Therapy Vasoconstriction Effects in Different Races

NCT03684213
View directory record Official record
Conditions
Cardiovascular Diseases, Cardiovascular Risk Factor, Vasoconstriction
Interventions
Control (Norepinephrine), Norepinephrine + Ascorbic Acid, Norepinephrine + L-NAME, Norepinephrine + L-NAME + Ascorbic Acid
Drug
Lead sponsor
The University of Texas at Arlington
Other
Eligibility
18 Years to 35 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2024
U.S. locations
1
States / cities
Arlington, Texas
Source: ClinicalTrials.gov public record
Updated Jun 10, 2024 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Insulin on Endothelin-Dependent Vascular Tone in the Forearm Circulation

NCT00001624
View directory record Official record
Conditions
Hyperinsulinemia
Interventions
Insulin
Drug
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
Not listed
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1997 – 2000
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 5, 2026, 8:52 AM EDT
Completed No phase listed Observational

Dexmedetomidine and Hypoxic Pulmonary Vasoconstriction in Thoracic Surgical Procedures and One-Lung Ventilation

NCT00839605
View directory record Official record
Conditions
Esophageal Cancer, Lung Cancer, Chest Wall Disorders
Interventions
Dexmedetomidine
Drug
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
19 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Oct 3, 2016 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Dose-response "Pilot" Study of Topically Delivered Clobetasol Propionate Lotion in Healthy Adult Subjects

NCT00864240
View directory record Official record
Conditions
Healthy
Interventions
Clobex TM (Clobetasol) 0.05% Lotion, single exposure
Drug
Lead sponsor
Actavis Inc.
Industry
Eligibility
18 Years to 50 Years · Female only
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 8, 2019 · Synced Sep 5, 2026, 8:52 AM EDT
Active, not recruiting No phase listed Observational

Florida Cerebrovascular Disease Biorepository and Genomics Center

NCT05491980
View directory record Official record
Conditions
Cerebrovascular Disease, Ischemic Stroke, Transient Ischemic Attack, Intracerebral Hemorrhage, Aneurysmal Subarachnoid Hemorrhage, Vascular Dementia, Anoxic Brain Injury, Unruptured Intracranial Aneurysm, Carotid Artery Stenosis Symptomatic, Asymptomatic Carotid Artery Stenosis, Non-Aneurysmal Perimesencephalic Subarachnoid Haemorrhage, Cerebral Venous Thrombosis, Moyamoya Disease, Fibromuscular Dysplasia, Subarachnoid Hemorrhage, Leukoaraiosis, Arteriovenous Fistula, Reversible Cerebral Vasoconstriction Syndrome, CADASIL
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
72 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2030
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Sep 2, 2026 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Influence of Race and MitoQ Supplementation on Skin Blood Flow in the Cold

NCT06784531
View directory record Official record
Conditions
Cold Exposure
Interventions
Mitoquinone mesylate (MitoQ), Placebo, Cold Water Hand Immersion, Cold Air Exposure
Dietary Supplement · Other
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
18 Years to 40 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Natick, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 29, 2026 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Effect of Local Antioxidant Therapy on Racial Differences in Vasoconstriction

NCT03680404
View directory record Official record
Conditions
Cardiovascular Diseases, Cardiovascular Risk Factor, Vasoconstriction
Interventions
Control (Phenylephrine), Phenylephrine + Apocynin, Phenylephrine + Allopurinol, Phenylephrine + Tempol
Drug
Lead sponsor
The University of Texas at Arlington
Other
Eligibility
18 Years to 35 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Arlington, Texas
Source: ClinicalTrials.gov public record
Updated Nov 4, 2020 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Sex Disparities in Hypoxic Sympatholysis and Impact of Obesity

NCT04436731
View directory record Official record
Conditions
Obesity, Healthy, Vasoconstriction, Vasodilation
Interventions
Cold Pressor Test
Other
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years to 45 Years
Enrollment
73 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2026
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 27, 2026 · Synced Sep 5, 2026, 8:52 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Hypoxic Pulmonary Vasoconstriction Pilot Study

NCT03733470
View directory record Official record
Conditions
Emphysema
Interventions
Sildenafil study group
Drug
Lead sponsor
Eric A. Hoffman
Other
Eligibility
30 Years to 60 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Sep 30, 2019 · Synced Sep 5, 2026, 8:52 AM EDT
Withdrawn Phase 4 Interventional

RCVS: The Rational Approach to Diagnosis and Treatment

NCT03150524
View directory record Official record
Conditions
Reversible Cerebral Vasoconstriction Syndrome
Interventions
TCD- cerebral blood flow velocities, Headache pain score, Neurological examination, Repeat Neuroimaging, Nimodipine, Verapamil ER
Diagnostic Test · Behavioral · Other + 1 more
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
2
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 17, 2019 · Synced Sep 5, 2026, 8:52 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Diesel Exhaust and Vascular Function

NCT01508637
View directory record Official record
Conditions
Cardiovascular Effects
Interventions
Diesel Exhaust, Filtered Air, Terazosin, placebo
Other · Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 49 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 2, 2015 · Synced Sep 5, 2026, 8:52 AM EDT