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ClinicalTrials.gov public records Last synced Oct 23, 2026, 7:33 AM EDT

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Showing 241–264 of 372 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Heart Rate Fast Clear all
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Association Between Fluid Administration, Oxytocin Administration, and Fetal Heart Rate Changes

NCT02121184
View directory record Official record
Conditions
Pregnancy, Labor Pain
Interventions
Routine oxytocin, Half-dose oxytocin
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 60 Years · Female only
Enrollment
172 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 29, 2024 · Synced Oct 23, 2026, 7:33 AM EDT
Completed No phase listed Observational

Prospective Observational Cohort Study of Fetal Atrial Flutter & Supraventricular Tachycardia

NCT03376438
View directory record Official record
Conditions
Atrial Flutter, Tachycardia, Supraventricular, Tachycardia, Atrial Ectopic, Tachycardia, Reciprocating, Tachycardia Atrial, Tachycardia, Atrioventricular Nodal Reentry, Tachycardia, Paroxysmal, Fetal Hydrops
Interventions
Prospective observational cohorts
Other
Lead sponsor
Edgar Jaeggi
Other
Eligibility
16 Years to 50 Years · Female only
Enrollment
330 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2025
U.S. locations
18
States / cities
Phoenix, Arizona • San Francisco, California • Denver, Colorado + 15 more
Source: ClinicalTrials.gov public record
Updated May 31, 2025 · Synced Oct 23, 2026, 7:33 AM EDT
Completed Not applicable Interventional

Remote Self-training Program for Patients With Postural Orthostatic Tachycardia Syndrome

NCT04603157
View directory record Official record
Conditions
Postural Orthostatic Tachycardia Syndrome
Interventions
Hybrid Exercise Training
Behavioral
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Mar 15, 2022 · Synced Oct 23, 2026, 7:33 AM EDT
Active, not recruiting No phase listed Observational

Abbott Atrial Fibrillation Post Approval Study

NCT05434650
View directory record Official record
Conditions
Atrial Arrhythmia, Atrium; Fibrillation, Atrial Tachycardia
Interventions
electrophysiology study and ablation with an Abbott Ablation Catheter
Device
Lead sponsor
Abbott Medical Devices
Industry
Eligibility
Not listed
Enrollment
200 participants
Timeline
2022 – 2026
U.S. locations
20
States / cities
Huntsville, Alabama • Little Rock, Arkansas • Rancho Mirage, California + 16 more
Source: ClinicalTrials.gov public record
Updated Nov 19, 2025 · Synced Oct 23, 2026, 7:33 AM EDT
Not listed No phase listed Observational

South Asian Arrhythmogenic Cardiomyopathy Registry

NCT04895540
View directory record Official record
Conditions
Arrhythmogenic Right Ventricular Cardiomyopathy, Arrhythmogenic Right Ventricular Dysplasia, Arrhythmogenic Ventricular Cardiomyopathy, Arrhythmogenic Cardiomyopathy, Ventricular Tachycardia, Sudden Cardiac Death
Interventions
ECG, Echocardiography, Cardiac MRI, Ambulatory ECG recording, Cardiac EP study, All study subjects will undergo sample collection for genetic testing.
Diagnostic Test · Genetic
Lead sponsor
Sheri Kashmir Institute of Medical Sciences
Other
Eligibility
Not listed
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 2, 2021 · Synced Oct 23, 2026, 7:33 AM EDT
Not listed Phase 4 Interventional

Effect of Ivabradine in Stage D HF/Cardiogenic Shock Patients on Dobutamine

NCT03387605
View directory record Official record
Conditions
Heart Failure, Cardiogenic Shock, Tachycardia
Interventions
Ivabradine, Placebo
Drug
Lead sponsor
Loyola University
Other
Eligibility
18 Years to 99 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated May 23, 2019 · Synced Oct 23, 2026, 7:33 AM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

Reducing Orthostatic Intolerance With Oral Rehydration in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Patients

NCT02854683
View directory record Official record
Conditions
Chronic Fatigue Syndrome, Myalgic Encephalomyelitis, Systemic Exertion Intolerance Disease (SEID), Postural Tachycardia Syndrome (POTS), Neurally Mediated Syncope (NMS)
Interventions
Normal Saline, Oral Rehydration Solution
Drug · Dietary Supplement
Lead sponsor
New York Medical College
Other
Eligibility
15 Years to 29 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
Hawthorne, New York
Source: ClinicalTrials.gov public record
Updated Jun 10, 2021 · Synced Oct 23, 2026, 7:33 AM EDT
Completed Phase 3 Interventional Results available

Ranolazine Implantable Cardioverter-Defibrillator Trial

NCT01215253
View directory record Official record
Conditions
Ischemic Cardiomyopathy, Nonischemic Cardiomyopathy, Heart Failure
Interventions
Ranolazine
Drug
Lead sponsor
University of Rochester
Other
Eligibility
21 Years and older
Enrollment
1,012 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
83
States / cities
Tucson, Arizona • Little Rock, Arkansas • East Palo Alto, California + 70 more
Source: ClinicalTrials.gov public record
Updated Aug 27, 2018 · Synced Oct 23, 2026, 7:33 AM EDT
Completed Not applicable Interventional

Evaluation of a Test Algorithm for Use to Analyze ECG Data Collected From a Test Device of a 24-hour Simulated Use Period

NCT07188129
View directory record Official record
Conditions
Atrial Fibrillation (AF), Tachycardia, Bradycardia, PVC - Premature Ventricular Contraction, Premature Atrial Contraction
Interventions
Test Algorithm and Test Device
Device
Lead sponsor
Zywie, Inc.
Industry
Eligibility
18 Years and older
Enrollment
153 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025
U.S. locations
1
States / cities
Bozeman, Montana
Source: ClinicalTrials.gov public record
Updated Sep 23, 2025 · Synced Oct 23, 2026, 7:33 AM EDT
Active, not recruiting Phase 2 Interventional

Restoring Iron Deficiency in POTS

NCT07197905
View directory record Official record
Conditions
POTS - Postural Orthostatic Tachycardia Syndrome
Interventions
Intravenous iron
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 13, 2026 · Synced Oct 23, 2026, 7:33 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Cardiovagal Baroreflex Deficits Impair Neurovascular Coupling and Cognition in POTS

NCT03261570
View directory record Official record
Conditions
Postural Orthostatic Tachycardia Syndrome (POTS), POTS, Orthostatic Intolerance
Interventions
Pyridostigmine, Digoxin, Placebo
Drug
Lead sponsor
New York Medical College
Other
Eligibility
15 Years to 30 Years · Female only
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
1
States / cities
Hawthorne, New York
Source: ClinicalTrials.gov public record
Updated Sep 28, 2022 · Synced Oct 23, 2026, 7:33 AM EDT
Completed Not applicable Interventional Results available

Atropine in Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT)

NCT02927223
View directory record Official record
Conditions
Catecholaminergic Polymorphic Ventricular Tachycardia
Interventions
Atropine, Exercise treadmill test
Drug · Procedure
Lead sponsor
Vanderbilt University
Other
Eligibility
6 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 28, 2020 · Synced Oct 23, 2026, 7:33 AM EDT
Completed No phase listed Observational

Effects of Monopolar Electrocautery Use During Surgery on Implanted Cardiac Defibrillators

NCT01572246
View directory record Official record
Conditions
Heart Failure, Tachycardia, Ventricular
Interventions
Optimal placement of return pad
Other
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years and older
Enrollment
167 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Feb 24, 2017 · Synced Oct 23, 2026, 7:33 AM EDT
Terminated Early Phase 1 Interventional Results available

Study of Cardiac PET/CT Imaging to Guide Ablation Treatment of Ventricular Tachycardia

NCT02962076
View directory record Official record
Conditions
Ventricular Tachycardia
Interventions
[C-11] Meta-hydroxyephedrine radioactive tracer (MHED)
Drug
Lead sponsor
Khaled Awad, MD
Other
Eligibility
18 Years to 80 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 24, 2024 · Synced Oct 23, 2026, 7:33 AM EDT
Recruiting Not applicable Interventional

Safety and Effectiveness of the Sphere-9™ Catheter and Affera™ Ablation System for the Treatment of Ventricular Tachycardia (Sphere VT)

NCT07585968
View directory record Official record
Conditions
Ventricular Tachycardia
Interventions
Sphere-9 Catheter with the Affera Mapping and Ablation System
Device
Lead sponsor
Medtronic Cardiac Ablation Solutions
Industry
Eligibility
18 Years to 85 Years
Enrollment
260 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
6
States / cities
Indianapolis, Indiana • Manhasset, New York • New York, New York + 3 more
Source: ClinicalTrials.gov public record
Updated Oct 13, 2026 · Synced Oct 23, 2026, 7:33 AM EDT
Not yet recruiting Not applicable Interventional

The Impact of Improved Vagal Function on Periaqueductal Gray Connectivity

NCT05618067
View directory record Official record
Conditions
Postural Tachycardia Syndrome
Interventions
breathing exercise training
Behavioral
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 50 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2028
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Sep 16, 2026 · Synced Oct 23, 2026, 7:33 AM EDT
Recruiting No phase listed Observational

ATrial Tachycardia PAcing Therapy in Congenital Heart

NCT03209583
View directory record Official record
Conditions
Atrial Arrhythmia, Atrial Tachycardia, Congenital Heart Disease, Pacemaker Re-Entrant Tachycardia
Interventions
Medtronic
Device
Lead sponsor
Ian Law
Other
Eligibility
Not listed
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2027
U.S. locations
14
States / cities
Los Angeles, California • Orange, California • Hollywood, Florida + 11 more
Source: ClinicalTrials.gov public record
Updated Mar 13, 2026 · Synced Oct 23, 2026, 7:33 AM EDT
Recruiting No phase listed Observational

Targeted Ablation to Isolate Scar Channels Causing Ventricular Tachycardia

NCT07814079
View directory record Official record
Conditions
Ventricular Tachycardia (VT), Ischemic Cardiomyopathy, Nonischemic Cardiomyopathy
Interventions
Selective Substrate Isolation
Procedure
Lead sponsor
New York Medical College
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Valhalla, New York
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Oct 23, 2026, 7:33 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Sleep Actigraphy in Postural Tachycardia Syndrome (POTS)

NCT00692471
View directory record Official record
Conditions
Postural Tachycardia Syndrome, Orthostatic Intolerance, Sleep Disorders
Interventions
Actigraphy Watch (motion sensors) with light sensors - ActiWatch from Minimitter
Device
Lead sponsor
Satish R. Raj
Other
Eligibility
18 Years to 65 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2029
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 23, 2026, 7:33 AM EDT
Completed No phase listed Observational

Tilt Table With Suspected Postural Orthostatic Tachycardia Syndrome (POTS) Subjects

NCT01617616
View directory record Official record
Conditions
Postural Orthostatic Tachycardia Syndrome, Syncope, Vasovagal, Neurocardiogenic Syncope
Interventions
Not listed
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
10 Years to 21 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 20, 2017 · Synced Oct 23, 2026, 7:33 AM EDT
Withdrawn Not applicable Interventional

Yoga and Rate and Duration of Inappropriate Sinus Tachycardia (IST) Episodes

NCT01695538
View directory record Official record
Conditions
Inappropriate Sinus Tachycardia
Interventions
Yoga
Other
Lead sponsor
Dhanunjaya Lakkireddy, MD, FACC
Other
Eligibility
18 Years to 60 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Nov 16, 2015 · Synced Oct 23, 2026, 7:33 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 28, 2023 · Synced Oct 23, 2026, 7:33 AM EDT
Active, not recruiting Early Phase 1 Interventional Accepts healthy volunteers

Autonomic Determinants of POTS - Pilot1

NCT04050410
View directory record Official record
Conditions
Postural Tachycardia Syndrome
Interventions
Moxonidine, Placebo
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 55 Years · Female only
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2026
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Mar 27, 2026 · Synced Oct 23, 2026, 7:33 AM EDT
Completed No phase listed Observational

MAVRIC VR ICD Registry

NCT00270933
View directory record Official record
Conditions
Ventricular Tachycardia, Ventricular Fibrillation
Interventions
Registry
Device
Lead sponsor
Medtronic Cardiac Rhythm and Heart Failure
Industry
Eligibility
18 Years and older
Enrollment
742 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2005
U.S. locations
81
States / cities
Birmingham, Alabama • Tuscaloosa, Alabama • Little Rock, Arkansas + 78 more
Source: ClinicalTrials.gov public record
Updated Dec 21, 2023 · Synced Oct 23, 2026, 7:33 AM EDT