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Showing 1–24 of 52 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Condition: Long QT Syndrome Clear all
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Influence of Progesterone Administration on Drug-Induced QT Interval Lengthening

NCT01929083
View directory record Official record
Conditions
Prolonged QT Interval in EKG and Sudden Death
Interventions
Progesterone, Placebo, Ibutilide
Drug
Lead sponsor
Indiana University
Other
Eligibility
21 Years to 40 Years · Female only
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
2
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Oct 29, 2015 · Synced Jun 10, 2026, 3:04 PM EDT
Terminated No phase listed Observational

A Registry to Determine the Clinical and Genetic Risk Factors for Torsade De Pointes

NCT02439645
View directory record Official record
Conditions
Long qt Syndrome, Torsade de Pointes
Interventions
Not listed
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2019
U.S. locations
4
States / cities
Boston, Massachusetts • West Roxbury, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 2, 2021 · Synced Jun 10, 2026, 3:04 PM EDT
Recruiting Not applicable Interventional

Continuous Versus Intermittent cARdiac Electrical moNitorinG

NCT04336644
View directory record Official record
Conditions
Torsades de Pointe Caused by Drug, Long QT Syndrome
Interventions
BodyGuardian Mini Plus
Device
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 29, 2025 · Synced Jun 10, 2026, 3:04 PM EDT
Completed No phase listed Observational

Multicenter Evaluation of Children and Young Adults With Genotype Positive Long QT Syndrome

NCT01705925
View directory record Official record
Conditions
Long QT Syndrome
Interventions
Not listed
Lead sponsor
Pediatrix
Other
Eligibility
Up to 20 Years
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2018
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated May 5, 2019 · Synced Jun 10, 2026, 3:04 PM EDT
Not listed Phase 1 Interventional Accepts healthy volunteers

Race Difference Moxifloxacin-induced QT Prolongation Between Healthy Chinese and Caucasian Volunteers

NCT02119091
View directory record Official record
Conditions
Cardiac Toxicity
Interventions
Moxifloxacin
Drug
Lead sponsor
Haiyan Li
Other
Eligibility
18 Years to 45 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
West Bend, Wisconsin
Source: ClinicalTrials.gov public record
Updated Apr 20, 2014 · Synced Jun 10, 2026, 3:04 PM EDT
Completed No phase listed Observational

Effects Rapid Atrial Pacing Has on the Electrocardiogram (ECG) in Patients With Dual Chamber Pacemakers

NCT00883610
View directory record Official record
Conditions
Prolonged QT Interval
Interventions
Not listed
Lead sponsor
Vanderbilt University
Other
Eligibility
21 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Dec 10, 2014 · Synced Jun 10, 2026, 3:04 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Fetal and Neonatal Magnetophysiology

NCT01903564
View directory record Official record
Conditions
Fetal Arrhythmia, Abnormality in Fetal Heart Rate or Rhythm, Long QT Syndrome
Interventions
magnetocardiography, postnatal ECG, fetal echocardiography
Device
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 60 Years · Female only
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2018
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated May 28, 2019 · Synced Jun 10, 2026, 3:04 PM EDT
Recruiting Not applicable Interventional

Comparing Direct vs Indirect Methods for Cascade Screening

NCT05348564
View directory record Official record
Conditions
Long QT Syndrome, Familial Hypercholesterolemia, Ethics, Genetic Testing
Interventions
Direct contact of family members for cascade screening of relevant variants
Behavioral
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Lancaster, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 13, 2026 · Synced Jun 10, 2026, 3:04 PM EDT
Not yet recruiting No phase listed Observational

MCG In Long QT Syndrome

NCT07270211
View directory record Official record
Conditions
Atrial Fibrillation
Interventions
Magnetocardiography
Diagnostic Test
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 4, 2026 · Synced Jun 10, 2026, 3:04 PM EDT
Terminated Phase 1 Interventional

Effect of Potassium and Acetazolamide on People With Andersen-Tawil Syndrome

NCT00839501
View directory record Official record
Conditions
Andersen-Tawil Syndrome
Interventions
Potassium, Acetazolamide
Dietary Supplement · Drug
Lead sponsor
University of Rochester
Other
Eligibility
10 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Jan 19, 2012 · Synced Jun 10, 2026, 3:04 PM EDT
Recruiting No phase listed Observational

Observational Study to Describe Health-Related Quality of Life and Measure Disease Burden Among Patients With Long QT Syndrome Types (LQTS) 2 and 3

NCT07075445
View directory record Official record
Conditions
Long QT Syndrome Type 3, Long QT Syndrome 2
Interventions
Not listed
Lead sponsor
Thryv Therapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Greenville, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 16, 2025 · Synced Jun 10, 2026, 3:04 PM EDT
Recruiting No phase listed Observational

Fetal Electrophysiologic Abnormalities in High-Risk Pregnancies Associated With Fetal Demise

NCT03775954
View directory record Official record
Conditions
High Risk Pregnancy, Congenital Heart Disease, Fetal Hydrops, Twin Monochorionic Monoamniotic Placenta, Gastroschisis, Fetal Demise, Stillbirth, Fetal Arrhythmia, Long QT Syndrome, Intrauterine Fetal Death, Sudden Infant Death, Pregnancy Loss, Twin Twin Transfusion Syndrome, Birth Defect, Fetal Cardiac Anomaly, Fetal Cardiac Disorder, Fetal Death, Brugada Syndrome, Fetal Tachycardia
Interventions
Fetal Magnetocardiogram and Neonatal Electrocardiogram, Substudy only: Maternal/Infant Pharmacogenomic assessment postnatally
Diagnostic Test · Genetic
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
18 Years and older · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2028
U.S. locations
2
States / cities
Madison, Wisconsin • Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Mar 3, 2026 · Synced Jun 10, 2026, 3:04 PM EDT
Completed No phase listed Observational

Exercise in Genetic Cardiovascular Conditions

NCT02549664
View directory record Official record
Conditions
Hypertrophic Cardiomyopathy, Long QT Syndrome
Interventions
Not listed
Lead sponsor
Yale University
Other
Eligibility
8 Years to 60 Years
Enrollment
4,299 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2022
U.S. locations
29
States / cities
Tucson, Arizona • Orange, California • San Diego, California + 24 more
Source: ClinicalTrials.gov public record
Updated Sep 4, 2023 · Synced Jun 10, 2026, 3:04 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Dose Ranging Escalation Study of Tramadol Hydrochloride in Healthy Volunteers

NCT01947920
View directory record Official record
Conditions
Healthy
Interventions
Tramadol HCl, 50 mg, Placebo
Drug
Lead sponsor
Janssen Scientific Affairs, LLC
Industry
Eligibility
18 Years to 45 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated Dec 15, 2014 · Synced Jun 10, 2026, 3:04 PM EDT
Completed Phase 2 Interventional Results available

Long-term Efficacy Study of Sodium Channel Blocker in LQT3 Patients

NCT01648205
View directory record Official record
Conditions
Long QT Syndrome
Interventions
Placebo, Ranolazine
Drug
Lead sponsor
University of Rochester
Other
Eligibility
21 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2018
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Apr 6, 2022 · Synced Jun 10, 2026, 3:04 PM EDT
Terminated Not applicable Interventional Results available

Pediatric Lead Extractability and Survival Evaluation (PLEASE)

NCT00335036
View directory record Official record
Conditions
Ventricular Tachycardia, Ventricular Fibrillation, Cardiomyopathy, Long QT Syndrome, Congenital Heart Disease
Interventions
ICD lead implant, Thin leads
Device
Lead sponsor
Charles Berul
Other
Eligibility
1 Year to 55 Years
Enrollment
748 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 18, 2026 · Synced Jun 10, 2026, 3:04 PM EDT
Not listed No phase listed Observational

Genetics of QT Prolongation With Antiarrhythmics

NCT02439658
View directory record Official record
Conditions
Long QT Syndrome, Drug Toxicity
Interventions
Dofetilide and/or sotalol
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
1,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2023
U.S. locations
5
States / cities
Aurora, Colorado • Boston, Massachusetts • Rochester, Minnesota + 1 more
Source: ClinicalTrials.gov public record
Updated Apr 3, 2022 · Synced Jun 10, 2026, 3:04 PM EDT
Not listed Phase 4 Interventional

Novel Form of Acquired Long QT Syndrome

NCT04169100
View directory record Official record
Conditions
Long QT Syndrome, Connective Tissue Diseases, Rheumatoid Arthritis
Interventions
Prednisone
Drug
Lead sponsor
Narrows Institute for Biomedical Research
Other
Eligibility
18 Years to 89 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2024
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 10, 2022 · Synced Jun 10, 2026, 3:04 PM EDT
Completed Phase 1 Interventional

Methadone Pharmacokinetics and Cardiac Effects in Newborns

NCT00715988
View directory record Official record
Conditions
Pain
Interventions
Methadone HCl Inject 10 mg/ml (will require dilution), Methadone
Drug
Lead sponsor
University of Utah
Other
Eligibility
29 Weeks to 48 Weeks
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2017
U.S. locations
2
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated May 31, 2022 · Synced Jun 10, 2026, 3:04 PM EDT
Completed No phase listed Observational Results available

Ondansetron and the QT Interval In Adult Emergency Department Patients

NCT01759420
View directory record Official record
Conditions
Ondansetron
Interventions
Ondansetron
Drug
Lead sponsor
C.R.Darnall Army Medical Center
Federal
Eligibility
18 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
2
States / cities
Fort Hood, Texas • Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Jun 25, 2014 · Synced Jun 10, 2026, 3:04 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study Evaluating the Effects of Multiple Oral Doses of ERB-041 on Cardiac Repolarization in Healthy Subjects

NCT00316459
View directory record Official record
Conditions
Healthy, Long QT Syndrome
Interventions
ERB-041
Drug
Lead sponsor
Wyeth is now a wholly owned subsidiary of Pfizer
Industry
Eligibility
18 Years to 55 Years
Enrollment
64 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2006
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Apr 12, 2007 · Synced Jun 10, 2026, 3:04 PM EDT
Terminated Not applicable Interventional Results available

Low-dose Epinephrine Infusion Tests in Adolescent and Pediatric Patients

NCT00548886
View directory record Official record
Conditions
Congenital Disorders
Interventions
Epinephrine
Drug
Lead sponsor
Emory University
Other
Eligibility
3 Years to 18 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Dec 5, 2017 · Synced Jun 10, 2026, 3:04 PM EDT
Enrolling by invitation No phase listed Observational

Embryo Assessment Utilizing Timelapse Imaging in Conjunction With Preimplantation Genetic Testing for Aneuploidy With Next Generation Sequencing

NCT06419127
View directory record Official record
Conditions
Infertility, Female, Infertility, Male, Infertility, IVF, Aneuploidy
Interventions
Timelapse incubation and PGT
Diagnostic Test
Lead sponsor
Gattaca Genomics
Industry
Eligibility
18 Years to 50 Years
Enrollment
2,000 participants
Timeline
2025 – 2033
U.S. locations
1
States / cities
Fort Lauderdale, Florida
Source: ClinicalTrials.gov public record
Updated Jan 28, 2026 · Synced Jun 10, 2026, 3:04 PM EDT
Completed No phase listed Observational

The Effect of General Anesthesia on the Risk for Arrhythmia

NCT01174251
View directory record Official record
Conditions
Arrhythmia
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
125 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Oct 7, 2013 · Synced Jun 10, 2026, 3:04 PM EDT