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Showing 1–24 of 49 matching trials from the live ClinicalTrials.gov search.
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Withdrawn Phase 2 Interventional

Effects of Nitric Oxide on the Endothelium During Hemolysis.

NCT03748082
View directory record Official record
Conditions
Endothelial Dysfunction, Hemolysis Intravascular, Cardiovascular Diseases, Cardiovascular Risk Factor
Interventions
Nitric Oxide, Reactive Hyperemia Index, Endothelial Cells Collection
Drug · Diagnostic Test · Procedure
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 1, 2025 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Phase 1 Interventional

Nitrite Infusion Studies

NCT00102271
View directory record Official record
Conditions
Healthy
Interventions
Oxypurinol, Sodium Nitrite
Drug
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
21 Years to 40 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2011
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 1, 2017 · Synced Sep 6, 2026, 1:28 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Endothelial Dysfunction After SCI

NCT07227727
View directory record Official record
Conditions
Spinal Cord Injuries, Endothelial Dysfunction
Interventions
Intra-arterial Infusion of Vasoactive Agents, Intra-arterial Vitamin C Infusion, Blood Sampling
Procedure
Lead sponsor
Craig Hospital
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Englewood, Colorado
Source: ClinicalTrials.gov public record
Updated Nov 13, 2025 · Synced Sep 6, 2026, 1:28 AM EDT
Not yet recruiting No phase listed Observational Accepts healthy volunteers

Hand Perfusion and Pulse Oximetry Performance

NCT06925646
View directory record Official record
Conditions
Oxygen Saturation
Interventions
Finger hyperperfusion via adenosine, Finger hypoperfusion via by norepinephrine, Baseline hypoxic test
Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 12, 2026 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Storage Lesion in Banked Blood Due to Disruption of Nitric Oxide (NO) Homeostasis

NCT01137656
View directory record Official record
Conditions
Healthy
Interventions
Acetylcholine and Blood
Drug
Lead sponsor
Mark Gladwin
Other
Eligibility
18 Years to 50 Years
Enrollment
53 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 13, 2015 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Not applicable Interventional

Coronary Artery Disease in Patients With Friedreich's Ataxia

NCT04649866
View directory record Official record
Conditions
Friedreich Ataxia
Interventions
plethysmography
Diagnostic Test
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 79 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 7, 2023 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Nebivolol and the Endothelin (ET)-1 System

NCT01395329
View directory record Official record
Conditions
Prehypertension, Hypertension
Interventions
Nebivolol, Metoprolol, Placebo, Forearm Blood Flow (FBF) response to BQ-123 (100 mol/min), FBF response to BQ-123 (100 nmol/min)+BQ-788(50 nmol/min), FBF response to Acetylcholine, FBF response to Sodium Nitroprusside, FBF response to BQ-123+BQ-788+ACh
Drug · Other
Lead sponsor
University of Colorado, Boulder
Other
Eligibility
45 Years to 65 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2016
U.S. locations
1
States / cities
Boulder, Colorado
Source: ClinicalTrials.gov public record
Updated Jan 1, 2019 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Nebivolol and Endothelial Regulation of Fibrinolysis (NERF)

NCT01595516
View directory record Official record
Conditions
Prehypertension, Hypertension
Interventions
Nebivolol, Metoprolol, Placebo, Bradykinin, Saline, Vitamin C
Drug · Other
Lead sponsor
University of Colorado, Boulder
Other
Eligibility
45 Years to 65 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
1
States / cities
Boulder, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 24, 2019 · Synced Sep 6, 2026, 1:28 AM EDT
Terminated Early Phase 1 Interventional Accepts healthy volunteers

The Study of Skeletal Muscle Blood Flow in Becker Muscular Dystrophy

NCT02653833
View directory record Official record
Conditions
Muscular Dystrophy
Interventions
Tadalafil 20 MG, beetroot juice extract
Drug · Other
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years to 45 Years · Male only
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 13, 2020 · Synced Sep 6, 2026, 1:28 AM EDT
Terminated Early Phase 1 Interventional Accepts healthy volunteers

The Role of S-nitrosohemoglobin in Regulating Systemic Blood Flow During Hypoxia and Normoxia

NCT01905696
View directory record Official record
Conditions
Focus is Determination of the Role of SNO-Hb in Forearm Blood Flow Regulation
Interventions
Oral N-acetylcysteine
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years to 40 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Dec 28, 2016 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Evaluation of Sports Supplements on Blood Flow

NCT04278053
View directory record Official record
Conditions
Determine the Effects of Nitrosigine and Citrulline-malate on Flow-mediated Dilation Among Young Adults
Interventions
inositol-stabilized arginine silicate
Dietary Supplement
Lead sponsor
University of Arkansas, Fayetteville
Other
Eligibility
18 Years to 29 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Fayetteville, Arkansas
Source: ClinicalTrials.gov public record
Updated May 23, 2022 · Synced Sep 6, 2026, 1:28 AM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Role of Endothelial Function in SCI CVD Risk

NCT06443151
View directory record Official record
Conditions
Spinal Cord Injuries, Cardiovascular Diseases, Endothelial Dysfunction
Interventions
Brachial intra-arterial infusion of vasoactive and antioxidant drugs (acetylcholine, nitroprusside, ascorbic acid), venous occlusion plethysmography, Acetylcholine, Sodium Nitroprusside, Ascorbic acid, venous phlebotomy
Procedure · Drug
Lead sponsor
Craig Hospital
Other
Eligibility
18 Years to 89 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Englewood, Colorado
Source: ClinicalTrials.gov public record
Updated Aug 19, 2024 · Synced Sep 6, 2026, 1:28 AM EDT
Recruiting No phase listed Observational

Testosterone Deficiency and Endothelial Dysfunction After Spinal Cord Injury

NCT07227740
View directory record Official record
Conditions
Spinal Cord Injuries, Endothelial Dysfunction, Testosterone Deficiency
Interventions
Intra-arterial Infusion of Vasoactive Agents, Intra-arterial Vitamin C Infusion, Blood Sampling
Diagnostic Test
Lead sponsor
Craig Hospital
Other
Eligibility
18 Years to 89 Years · Male only
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Englewood, Colorado
Source: ClinicalTrials.gov public record
Updated Nov 20, 2025 · Synced Sep 6, 2026, 1:28 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Assessment of Vascular Endothelial Function in Postural Tachycardia Syndrome

NCT01308099
View directory record Official record
Conditions
Postural Tachycardia Syndrome
Interventions
Blood Pressure and Blood Flow
Device
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 60 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2017
U.S. locations
2
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 17, 2017 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Phase 4 Interventional Results available

Phosphate Lowering in CKD Trial

NCT02209636
View directory record Official record
Conditions
Chronic Kidney Disease, Cardiovascular Disease
Interventions
Lanthanum carbonate, placebo, Ascorbic Acid, Nitroglycerin, Flow-mediated dilation measurement, Aortic pulse-wave velocity, Endothelial cell collection
Drug · Procedure
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
40 Years to 79 Years
Enrollment
66 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Aug 25, 2022 · Synced Sep 6, 2026, 1:28 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Hot Flashes and Neurovascular Function in Women

NCT05193968
View directory record Official record
Conditions
Hot Flashes, Menopause, Vasomotor System; Labile
Interventions
Sympathoexcitatory stressors, Sodium Nitroprusside, Acetylcholine, Terbutaline, Norepinephrine
Other · Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
40 Years to 60 Years · Female only
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Sep 6, 2026, 1:28 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 6, 2026, 1:28 AM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers

Role of Adenosine in the Release of VEGF and Cytokines

NCT00580905
View directory record Official record
Conditions
Inflammation
Interventions
Adenosine, Sodium Nitroprusside
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 60 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2017
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Feb 27, 2018 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effects of Nebivolol on Skeletal Muscle During Exercise in Hypertensive Patients

NCT01501929
View directory record Official record
Conditions
Hypertension
Interventions
Metoprolol succinate, Nebivolol, Non-invasive measurement of Cardiac Output (CO), Endothelial cell collection, Microvascular perfusion assessment using Definity
Drug · Procedure
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Nov 5, 2018 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Ischemia/Reperfusion Injury of Human Endothelium: Role of Glucose and Statins

NCT00995670
View directory record Official record
Conditions
Hyperglycemia
Interventions
5% dextrose, Vitamin C, Simvastatin, Sevoflurane
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years to 35 Years
Enrollment
59 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Mar 16, 2015 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Not applicable Interventional

Blood Volume and Hemodynamic Analysis in Patients With Chronic Heart Failure

NCT02120014
View directory record Official record
Conditions
Congestive Heart Failure
Interventions
blood volume measurement, venous plethysmography
Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2018
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 23, 2018 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Effects of Heating on Exercise Pressor Reflex in Peripheral Artery Disease: Exercise Ability

NCT03900832
View directory record Official record
Conditions
PAD
Interventions
Without Heating, Warm Bath, Neutral Bath, Heating Suit, Lower limb warm water immersion, Gardner walking protocol
Other
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
21 Years to 85 Years
Enrollment
33 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2025
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 15, 2025 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Pharmacogenetics of Ace Inhibitor-Associated Angioedema

NCT01413542
View directory record Official record
Conditions
Hypertension, Diabetes Type 2
Interventions
Sitagliptin (DPP4 inhibitor), Substance P,, bradykinin, enalaprilat (ACE inhibitor), Glucagon-like peptide 1, brain natriuretic peptide
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 65 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Nov 3, 2015 · Synced Sep 6, 2026, 1:28 AM EDT
Completed Phase 4 Interventional Results available

The Effect of Linagliptin on Mitochondrial and Endothelial Function

NCT01969084
View directory record Official record
Conditions
Type II Diabetes Mellitus
Interventions
Linagliptin, Placebo, Microcirculation testing, Macrocirculation testing, MRI Scans
Drug · Other
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
30 Years to 70 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 17, 2016 · Synced Sep 6, 2026, 1:28 AM EDT