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Showing 1–23 of 23 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Phenylephrine bolus Clear all
Recruiting Not applicable Interventional Accepts healthy volunteers

Acute and Chronic Repercussion of Spinal Cord Stimulation After Spinal Cord Injury

NCT07210411
View directory record Official record
Conditions
Spinal Cord Injuries
Interventions
Tests of sympathetic inhibition, Tests of above level sympathetic activation, Testing of below level sympathetic activation, Epidural stimulation, Transcutaneous stimulation
Diagnostic Test · Device
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 50 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2031
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 2, 2026, 1:37 AM EDT
Not listed Phase 2 Interventional

Methylene Blue as a Third-line Vasopressor in Septic Shock

NCT04089072
View directory record Official record
Conditions
Septic Shock
Interventions
Methylene Blue, Phenylephrine
Drug
Lead sponsor
Carilion Clinic
Other
Eligibility
18 Years and older
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Roanoke, Virginia
Source: ClinicalTrials.gov public record
Updated Jul 25, 2022 · Synced Sep 2, 2026, 1:37 AM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Role of Sympathetic Overactivity and Angiotensin II in PTSD and CV

NCT02560805
View directory record Official record
Conditions
Stress Disorders, Post-Traumatic
Interventions
Microneurography, Combat virtual reality video clip, Handgrip Exercise, Cold Pressor Test (CPT), Sodium Nitroprusside (SNP), Phenylephrine, Losartan, Atenolol, Transcutaneous Vagal Nerve Stimulation (tVNS), Sham Transcutaneous Vagal Nerve Stimulation (tVNS)
Procedure · Behavioral · Drug + 1 more
Lead sponsor
Emory University
Other
Eligibility
18 Years to 65 Years
Enrollment
134 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2027
U.S. locations
1
States / cities
Decatur, Georgia
Source: ClinicalTrials.gov public record
Updated May 17, 2026 · Synced Sep 2, 2026, 1:37 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Chemoreflex and Baroreflex Alterations Causing Postural Tachycardia Syndrome With Orthostatic Hyperpnea and Hypocapnia

NCT05923840
View directory record Official record
Conditions
Postural Orthostatic Tachycardia Syndrome, Hypocapnia, Hyperventilation
Interventions
Chemoreflex Testing, Baroreflex testing, Orthostatic stress testing
Diagnostic Test
Lead sponsor
New York Medical College
Other
Eligibility
15 Years to 39 Years · Female only
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Hawthorne, New York
Source: ClinicalTrials.gov public record
Updated Jun 27, 2023 · Synced Sep 2, 2026, 1:37 AM EDT
Recruiting Phase 4 Interventional

The Choice of Vasopressor to Prevent Postoperative Acute Kidney Injury After Major Non-Cardiac Surgery

NCT06802224
View directory record Official record
Conditions
Anesthesia, Surgery With General Anesthesia, Noncardiac Surgery, Hypotension During Surgery, Acute Kidney Injury (AKI), Myocardial Injury After Noncardiac Surgery (MINS), Vasopressor
Interventions
Norepinephrine, Phenylephrine
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
18,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
9
States / cities
San Francisco, California • College Park, Maryland • Ann Arbor, Michigan + 6 more
Source: ClinicalTrials.gov public record
Updated May 25, 2026 · Synced Sep 2, 2026, 1:37 AM EDT
Completed Phase 4 Interventional Results available

Oxytocin And Uterotonic Agent Use For Cesarean Delivery

NCT01549223
View directory record Official record
Conditions
Uterine Atony, Hypotension
Interventions
Oxytocin Infusion, Oxytocin Bolus
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 28, 2017 · Synced Sep 2, 2026, 1:37 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Deciphering Preserved Autonomic Function After Spinal Cord Injury

NCT04493372
View directory record Official record
Conditions
Spinal Cord Injuries, Autonomic Imbalance, Autonomic Dysreflexia, Orthostatic Hypotension
Interventions
Tests of sympathetic inhibition, Tests of sympathetic activation, Testing of autonomic dysreflexia
Diagnostic Test
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 50 Years
Enrollment
69 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2026
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 2, 2026, 1:37 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study to Investigate the Effects of Single Intravenous Doses of Difelikefalin (CR845) on the QTc Interval in Healthy Subjects

NCT04019574
View directory record Official record
Conditions
Healthy
Interventions
CR845 0.5 mcg/kg IV, CR845 3 mcg/kg IV, Moxifloxacin 400 mg Oral Tablet, Placebo
Drug · Other
Lead sponsor
Cara Therapeutics, Inc.
Industry
Eligibility
18 Years to 45 Years
Enrollment
57 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Feb 20, 2020 · Synced Sep 2, 2026, 1:37 AM EDT
Terminated Not applicable Interventional Results available

Cerebral Oximetry in Single Lung Ventilation Thoracic Surgery

NCT01866657
View directory record Official record
Conditions
Hypoxia
Interventions
Vasoconstrictor Agents, Head/neck repositioning, Increase ETCO2, IV fluid bolus, Additional anesthesia, RBC transfusion, Increase FiO2
Drug · Other · Biological
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
65 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 4, 2022 · Synced Sep 2, 2026, 1:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Transcutaneous Spinal Cord Neuromodulation to Normalize Autonomic Phenotypes

NCT04858178
View directory record Official record
Conditions
Spinal Cord Injuries, Autonomic Imbalance, Autonomic Dysreflexia, Orthostatic; Hypotension, Neurogenic
Interventions
Tests of sympathetic inhibition, Tests of sympathetic activation, Testing of autonomic dysreflexia, Transcutaneous spinal cord stimulation
Diagnostic Test · Device
Lead sponsor
Spaulding Rehabilitation Hospital
Other
Eligibility
18 Years to 30 Years
Enrollment
4 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 13, 2023 · Synced Sep 2, 2026, 1:37 AM EDT
Withdrawn Not applicable Interventional

Phenylephrine Dose and Mode of Administration for Spinal Anesthesia Induced Hypotension

NCT02101047
View directory record Official record
Conditions
Complications; Cesarean Section, Spinal Anesthetics Causing Adverse Effects in Therapeutic Use
Interventions
Phenylephrine
Drug
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 45 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 7, 2017 · Synced Sep 2, 2026, 1:37 AM EDT
Recruiting Not applicable Interventional

Longitudinal Autonomic Characterization as a Predictor for Secondary Medical Complications Post-SCI

NCT07210437
View directory record Official record
Conditions
Spinal Cord Injuries
Interventions
Tests of sympathetic inhibition, Tests of above level sympathetic activation, Testing of below level sympathetic activation
Diagnostic Test
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 75 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 2, 2026, 1:37 AM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Autoimmune Basis for Postural Tachycardia Syndrome

NCT02725060
View directory record Official record
Conditions
Postural Orthostatic Tachycardia Syndrome, Postural Tachycardia Syndrome, Tachycardia, Arrhythmias, Cardiac, Autonomic Nervous System Diseases, Orthostatic Intolerance, Cardiovascular Diseases, Primary Dysautonomias
Interventions
phenylephrine, isoproterenol, 25 micro-Ci of radiation, Posture study with blood samples, 24-hour heart rhythm and blood pressure monitoring, Quantitative Axonal Sudomotor Reflex Testing, Autonomic function tests, Rebreathing test, Assessment of splanchnic capacitance, microneurography
Drug · Radiation · Procedure + 1 more
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 50 Years
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2026
U.S. locations
2
States / cities
Oklahoma City, Oklahoma • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Nov 11, 2025 · Synced Sep 2, 2026, 1:37 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 2, 2026, 1:37 AM EDT
Completed Not applicable Interventional

Pilot Study of Real-Time Blood Pressure Decision Support During Cesarean Delivery Under Spinal Anesthesia

NCT07534774
View directory record Official record
Conditions
Spinal Hypotension
Interventions
ARX Decision-Support Display
Other
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 15, 2026 · Synced Sep 2, 2026, 1:37 AM EDT
Recruiting Phase 1Phase 2 Interventional

Use of Phenylephrine for Assessment of Mitral Regurgitation Severity

NCT04500899
View directory record Official record
Conditions
Mitral Regurgitation
Interventions
Mydfrin
Drug
Lead sponsor
Montefiore Medical Center
Other
Eligibility
18 Years and older
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 19, 2025 · Synced Sep 2, 2026, 1:37 AM EDT
Completed Phase 4 Interventional Results available

Preventing Hypotension in Parturients With an Elevated Body Mass Index (BMI)

NCT01481740
View directory record Official record
Conditions
Hypotension
Interventions
Phenylephrine bolus, phenylephrine infusion
Drug
Lead sponsor
IWK Health Centre
Other
Eligibility
18 Years and older · Female only
Enrollment
178 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 22, 2018 · Synced Sep 2, 2026, 1:37 AM EDT
Completed Not applicable Interventional

Randomized Trial of Restrictive Versus Liberal Perioperative Fluid Management for Patients Undergoing Pancreatic Resection

NCT01058746
View directory record Official record
Conditions
Pancreatic Cancer
Interventions
restrictive perioperative fluid management, Liberal perioperative fluid management
Other
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
331 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 24, 2019 · Synced Sep 2, 2026, 1:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Phenylephrine in Spinal Anesthesia in Preeclamptic Patients

NCT00458003
View directory record Official record
Conditions
Preeclampsia, Hypotension
Interventions
Ephedrine, Phenylephrine
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 60 Years · Female only
Enrollment
110 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2016
U.S. locations
2
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 1, 2022 · Synced Sep 2, 2026, 1:37 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Deciphering Preserved Autonomic Function After Multiple Sclerosis

NCT07012135
View directory record Official record
Conditions
Multiple Sclerosis, Control Subjects, Autonomic Dysreflexia
Interventions
Tests of sympathetic inhibition, Tests of sympathetic activation, Testing of autonomic dysreflexia
Diagnostic Test
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 50 Years
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 2, 2026, 1:37 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Characterization of Sympathetic Nerve Activity in Stress Cardiomyopathy

NCT01048125
View directory record Official record
Conditions
Cardiomyopathy
Interventions
Sympathetic Nerve Activity, Mental Stress Test (Color Word Test), The Modified Oxford Technique for Baroreflex Sensitivity, Cold Pressor Test, Echocardiographic evaluation
Device · Behavioral · Drug + 1 more
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
21 Years to 90 Years
Enrollment
2 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Nov 22, 2016 · Synced Sep 2, 2026, 1:37 AM EDT
Completed Phase 2 Interventional Results available

Hemodynamics and Extravascular Lung Water in Acute Lung Injury

NCT00624650
View directory record Official record
Conditions
Acute Lung Injury
Interventions
Diuresis (furosemide) part I, Fluid Bolus (crystalloid or albumin), Vasopressors (Norepinephrine, Vasopressin, Phenylephrine, Epinephrine), Dobutamine, Concentrate all drips and nutrition, Diuresis (furosemide) part II, Dialysis
Drug · Other · Procedure
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
3
States / cities
Clackamas, Oregon • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 9, 2019 · Synced Sep 2, 2026, 1:37 AM EDT
Not listed Phase 4 Interventional Accepts healthy volunteers

Study to Determine the Pharmacokinetics and Pharmacodynamic Effects of Phenylephrine on BP Via IV

NCT02323399
View directory record Official record
Conditions
Hypotension
Interventions
Phenylephrine
Drug
Lead sponsor
West-Ward Pharmaceutical
Industry
Eligibility
12 Years to 16 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2024
U.S. locations
10
States / cities
Wilmington, Delaware • Washington D.C., District of Columbia • Miami, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Jul 22, 2024 · Synced Sep 2, 2026, 1:37 AM EDT