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Showing 1–24 of 129 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Cardiac Death, Sudden Clear all
Recruiting No phase listed Observational

Observational Study of Cardiac Arrhythmias During Treatment With BTK Inhibitors or Venetoclax

NCT05724121
View directory record Official record
Conditions
Chronic Lymphocytic Leukemia (CLL), Waldenstr(SqrRoot)(Delta)m s Macroglobulinemia, Mantle Cell Lymphoma, Sudden Cardiac Death, Cardiac Arrhythmias, Hematologic Malignancies
Interventions
Not listed
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
18 Years to 110 Years
Enrollment
135 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Sep 13, 2026, 6:40 PM EDT
Completed No phase listed Observational Results available

Extracellular Matrix Marker of Arrhythmia Risk (EMMA)

NCT00376532
View directory record Official record
Conditions
Myocardiopathies, Ischemia, Myocardial, Arrythmia, Death, Sudden, Cardiac
Interventions
Not listed
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years and older
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 3, 2014 · Synced Sep 13, 2026, 6:40 PM EDT
Completed Phase 3 Interventional

Home Use of Automatic External Defibrillators to Treat Sudden Cardiac Arrest

NCT00047411
View directory record Official record
Conditions
Cardiovascular Diseases, Myocardial Infarction, Heart Diseases, Death, Sudden, Cardiac
Interventions
Cardiopulmonary Resuscitation, Automatic External Defibrillation
Other · Device
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
18 Years and older
Enrollment
7,001 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 9, 2008 · Synced Sep 13, 2026, 6:40 PM EDT
Recruiting No phase listed Observational

Imaging Techniques for Identifying Factors of Sudden Cardiac Death Risk

NCT00181233
View directory record Official record
Conditions
Sudden Cardiac Death
Interventions
Not listed
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2029
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 13, 2026 · Synced Sep 13, 2026, 6:40 PM EDT
Terminated Phase 3 Interventional Results available

Effect of Eleclazine on Shortening of the QT Interval, Safety, and Tolerability in Adults With Long QT Syndrome Type 3

NCT02300558
View directory record Official record
Conditions
Long QT Syndrome Type 3
Interventions
Eleclazine, Eleclazine placebo
Drug
Lead sponsor
Gilead Sciences
Industry
Eligibility
18 Years to 70 Years
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
3
States / cities
Rochester, Minnesota • New York, New York • Rochester, New York
Source: ClinicalTrials.gov public record
Updated Jan 11, 2018 · Synced Sep 13, 2026, 6:40 PM EDT
Completed No phase listed Observational

Signs and Symptoms Associated With Molecular Defects in Genetically Inherited Heart Disease

NCT00027196
View directory record Official record
Conditions
Congenital Heart Defect
Interventions
Not listed
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
Not listed
Enrollment
9,999,999 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1998 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 13, 2026, 6:40 PM EDT
Not listed Phase 3 Interventional

Cardiac Sympathetic Denervation for Prevention of Ventricular Tachyarrhythmias

NCT01013714
View directory record Official record
Conditions
Sudden Cardiac Death, Ventricular Tachycardia, Ventricular Fibrillation, Cardiomyopathy
Interventions
Cardiac Sympathetic Denervation (CSD), Routine Care
Procedure · Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
3
States / cities
Los Angeles, California • Portland, Oregon • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 18, 2024 · Synced Sep 13, 2026, 6:40 PM EDT
Completed No phase listed Observational

Genetic Substudy of the Alternans Before Cardioverter Defibrillator (ABCD) Trial

NCT00583297
View directory record Official record
Conditions
Ventricular Tachycardia, Cardiovascular Diseases, Arrythmia, CVD
Interventions
Not listed
Lead sponsor
CardioDx
Industry
Eligibility
18 Years and older
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 21, 2018 · Synced Sep 13, 2026, 6:40 PM EDT
Terminated Not applicable Interventional Results available

DEfibrillators To REduce Risk by MagnetIc ResoNance Imaging Evaluation

NCT00487279
View directory record Official record
Conditions
Coronary Artery Disease, Left Ventricular Dysfunction, Sudden Cardiac Death
Interventions
Defibrillator, Control
Device · Other
Lead sponsor
Abbott Medical Devices
Industry
Eligibility
18 Years and older
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
56
States / cities
Anchorage, Alaska • Tucson, Arizona • Glendale, California + 42 more
Source: ClinicalTrials.gov public record
Updated Feb 4, 2019 · Synced Sep 13, 2026, 6:40 PM EDT
Completed No phase listed Observational

Prognostic Significance of T Wave Alternans

NCT00006501
View directory record Official record
Conditions
Heart Diseases, Ventricular Arrhythmia, Ventricular Fibrillation, Death, Sudden, Cardiac, Heart Arrest
Interventions
ECG
Procedure
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
549 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2012
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Dec 22, 2015 · Synced Sep 13, 2026, 6:40 PM EDT
Completed Phase 1 Interventional

Nurses Helping Sudden Cardiac Arrest Survivors Recover After Getting An Implantable Cardioverter Defibrillator (ICD)

NCT00226681
View directory record Official record
Conditions
Sudden Cardiac Arrest
Interventions
Nursing Telephone Support Protocol, Usual Care
Behavioral
Lead sponsor
National Institute of Nursing Research (NINR)
NIH
Eligibility
12 Years to 90 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2004
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 9, 2008 · Synced Sep 13, 2026, 6:40 PM EDT
Not listed Not applicable Interventional

Sodium Channel Splicing in Heart Failure Trial (SOCS-HEFT) Prospective Study

NCT02738749
View directory record Official record
Conditions
Death, Sudden, Cardiac
Interventions
Implantable cardioverter-defibrillator (ICD)
Device
Lead sponsor
Rhode Island Hospital
Other
Eligibility
18 Years and older
Enrollment
450 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2020
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Apr 11, 2017 · Synced Sep 13, 2026, 6:40 PM EDT
Recruiting No phase listed Observational

ASSURE WCD Clinical Evaluation - Post Approval Study (ACE-PAS)

NCT05135403
View directory record Official record
Conditions
Sudden Cardiac Arrest
Interventions
Defibrillation
Device
Lead sponsor
Kestra Medical Technologies, Inc.
Industry
Eligibility
18 Years and older
Enrollment
5,179 participants
Timeline
2021 – 2025
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 1, 2025 · Synced Sep 13, 2026, 6:40 PM EDT
Completed No phase listed Observational

Implantable Cardiac Defibrillators for the Prevention of Sudden Death in Patients With Cardiac Sarcoidosis

NCT01013311
View directory record Official record
Conditions
Sarcoidosis of the Heart, Cardiomyopathy
Interventions
Not listed
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Jun 4, 2023 · Synced Sep 13, 2026, 6:40 PM EDT
Recruiting No phase listed Observational

HeartStart HS1 Defibrillator* Event Registry

NCT04840797
View directory record Official record
Conditions
Sudden Cardiac Arrest
Interventions
HeartStart HS1
Device
Lead sponsor
Heartstream US LLC
Industry
Eligibility
Not listed
Enrollment
1,400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2030
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 10, 2026 · Synced Sep 13, 2026, 6:40 PM EDT
Active, not recruiting No phase listed Observational

Neural Circulatory Control and SUDEP Risk.

NCT02813980
View directory record Official record
Conditions
Epilepsy, Seizures
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 90 Years
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2031
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Sep 13, 2026, 6:40 PM EDT
Terminated No phase listed Observational

Study of Paced QRS Duration as a Marker of Sudden Cardiac Death

NCT01948206
View directory record Official record
Conditions
Sudden Cardiac Death
Interventions
Not listed
Lead sponsor
Pocono Medical Center
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
East Stroudsburg, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 12, 2016 · Synced Sep 13, 2026, 6:40 PM EDT
Completed Not applicable Interventional

Feasibility Study of Remote Support for Implantable Pulse Generator (IPG)/Implantable Cardioverter Defibrillator (ICD) Implant

NCT01809652
View directory record Official record
Conditions
Bradycardia, Sudden Cardiac Arrest
Interventions
Remote Implant Support Capability
Other
Lead sponsor
Medtronic Cardiac Rhythm and Heart Failure
Industry
Eligibility
18 Years and older
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 23, 2014 · Synced Sep 13, 2026, 6:40 PM EDT
Completed No phase listed Observational

Identification of Risk Factors for Arrhythmia in Children and Adolescents With Hypertrophic Cardiomyopathy

NCT00753233
View directory record Official record
Conditions
Hypertrophic Cardiomyopathy (HCM)
Interventions
Not listed
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
Up to 21 Years
Enrollment
145 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 1, 2017 · Synced Sep 13, 2026, 6:40 PM EDT
Completed Not applicable Interventional Results available

Hemodynamic Effects of Standard Cardiopulmonary Resuscitation (CPR), Active Compression Decompression CPR With an Inspiratory Impedance Device, and Standard CPR With an Intrathoracic Pressure Regulator During Out-of-hospital Cardiac Arrest

NCT01325870
View directory record Official record
Conditions
Cardiac Arrest, Sudden Cardiac Death
Interventions
ACD-CPR, ITPR, S-CPR, Impedance Threshold Device (ITD)
Device · Procedure
Lead sponsor
Advanced Circulatory Systems
Industry
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Kalamazoo, Michigan
Source: ClinicalTrials.gov public record
Updated Aug 11, 2016 · Synced Sep 13, 2026, 6:40 PM EDT
Recruiting No phase listed Observational

Left Ventricular Structural Predictors of Sudden Cardiac Death

NCT01076660
View directory record Official record
Conditions
Ischemic Cardiomyopathy, Nonischemic Cardiomyopathy
Interventions
Not listed
Lead sponsor
Johns Hopkins University
Other
Eligibility
21 Years to 80 Years
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2030
U.S. locations
2
States / cities
Newark, Delaware • Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jan 19, 2026 · Synced Sep 13, 2026, 6:40 PM EDT
Completed No phase listed Observational

T Wave Alternans in Hemodialysis

NCT00296543
View directory record Official record
Conditions
End Stage Renal Disease, Coronary Heart Disease, Congestive Heart Failure
Interventions
Not listed
Lead sponsor
Indiana University
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Jun 19, 2011 · Synced Sep 13, 2026, 6:40 PM EDT
Completed No phase listed Observational

Personalized Risk Identification and Management for Arrhythmias and Heart Failure by ECG and MRI

NCT01353131
View directory record Official record
Conditions
Inpatients and Outpatients With Routine 12-lead ECG
Interventions
Not listed
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 70 Years
Enrollment
162 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 5, 2018 · Synced Sep 13, 2026, 6:40 PM EDT
Completed No phase listed Observational

Heart and Skeletal Muscle Problems in Neuroacanthocytosis

NCT00007228
View directory record Official record
Conditions
Choreatic Disorder
Interventions
Not listed
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
Not listed
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 13, 2026, 6:40 PM EDT