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64 studies found for:    arrhythmia OR atrial fibrillation OR ventricular fibrillation OR tachycardia OR bradycardia | Open Studies | NIH, U.S. Fed
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Rank Status Study
1 Recruiting MRI Assessment of Arrythmia Ablation Lesions
Conditions: Ventricular Tachycardia;   Cardiac Arrhythmia
Intervention: Other: MRI scan
2 Recruiting A Study of Pyridostigmine in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Drug: pyridostigmine;   Drug: Placebo
3 Recruiting New Formulations of Propafenone to Treat Atrial Fibrillation
Condition: Atrial Fibrillation
Interventions: Drug: (R)-propafenone;   Drug: (S)-Propafenone;   Drug: Placebo
4 Recruiting Influence of Sleep Apnea on Risk of Atrial Fibrillation
Conditions: Sleep Apnea;   Atrial Fibrillation
Intervention: Other: Continuous Positive Airway Pressure
5 Not yet recruiting Skin Sympathetic Nerve Activity and Cardiac Arrhythmias
Condition: Sympathetic Nerve Activity
Intervention: Other: Physiologic maneuvers
6 Recruiting Substrate Versus Trigger Ablation for Paroxysmal Atrial Fibrillation
Condition: Atrial Fibrillation
Interventions: Procedure: FIRM Ablation;   Procedure: Conventional AF ablation with PVI
7 Recruiting Pathophysiology of Orthostatic Intolerance
Conditions: Tachycardia;   Postural Orthostatic Tachycardia Syndrome
Interventions: Radiation: DAXOR;   Procedure: QSweat;   Drug: Intrinsic Heart Rate
8 Recruiting Vein of Marshall Ethanol Infusion for Persistent Atrial Fibrillation
Conditions: Ventricular Tachycardia;   Atrial Fibrillation
Interventions: Drug: Ethanol;   Procedure: Ablation
9 Recruiting Reducing Orthostatic Intolerance With Oral Rehydration in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Patients
Conditions: Chronic Fatigue Syndrome;   Myalgic Encephalomyelitis;   Systemic Exertion Intolerance Disease (SEID);   Postural Tachycardia Syndrome (POTS);   Neurally Mediated Syncope (NMS)
Interventions: Drug: Normal Saline;   Dietary Supplement: Oral Rehydration Solution
10 Recruiting Identification of Genomic Predictors of Adverse Events After Cardiac Surgery
Conditions: Heart; Dysfunction Postoperative, Cardiac Surgery;   Genetic Predisposition to Disease;   Atrial Fibrillation;   Myocardial Infarction;   Heart Failure
Intervention:
11 Recruiting Plerixafor After Radiation Therapy and Temozolomide in Treating Patients With Newly Diagnosed High Grade Glioma
Conditions: Adult Ependymoblastoma;   Adult Giant Cell Glioblastoma;   Adult Glioblastoma;   Adult Gliosarcoma;   Adult Medulloblastoma;   Adult Mixed Glioma;   Adult Oligodendroglial Tumors;   Adult Pineoblastoma;   Adult Supratentorial Primitive Neuroectodermal Tumor (PNET)
Interventions: Radiation: radiation therapy;   Drug: temozolomide;   Drug: plerixafor;   Other: laboratory biomarker analysis;   Other: pharmacological study
12 Recruiting Exercise in Genetic Cardiovascular Conditions
Conditions: Hypertrophic Cardiomyopathy;   Long QT Syndrome
Intervention:
13 Not yet recruiting Cardiac Sympathetic Denervation for Prevention of Ventricular Tachyarrhythmias
Conditions: Sudden Cardiac Death;   Ventricular Tachycardia;   Ventricular Fibrillation;   Cardiomyopathy
Interventions: Procedure: Cardiac Sympathetic Denervation (CSD);   Drug: Routine Care
14 Recruiting Open-Labeled PK-PD Studies of Metoprolol ER
Condition: Blood Pressure
Interventions: Drug: Toprol XL;   Device: SmartPill Capsule;   Procedure: Exercise Treadmill;   Procedure: 24 hour holter monitor;   Other: 24-hour pharmacokinetic parameters;   Drug: Wockhardt metoprolol;   Drug: Activas metoprolol
15 Recruiting Inflammation, Viral Replication, and Atherosclerosis in Treated HIV Infection
Condition: Atherosclerosis
Intervention:
16 Recruiting Clinical Autonomic Disorders: A Training Protocol
Conditions: Chronic Fatigue Syndrome;   Pseudopheochromocytoma;   Healthy Volunteers;   Neurocardiogenic Syncope;   Postural Tachycardia Syndrome
Intervention:
17 Recruiting CT COMPARE: CT COronary Angiography to Measure PlAque REduction
Condition: Cardiovascular Disease
Interventions: Drug: Rosuvastatin;   Drug: Atorvastatin
18 Recruiting Prospective Observational Study of the ICD in Sudden Cardiac Death Prevention
Conditions: Heart Failure, Congestive;   Death, Sudden, Cardiac;   Arrhythmia;   Cardiomyopathies
Intervention:
19 Recruiting Measurement of Autonomic Cardiovascular Integrity in Persons With SCI
Condition: Spinal Cord Injury
Intervention:
20 Recruiting A Genomic Approach to Warfarin Dose Prescription in Admixed Caribbean Hispanics
Conditions: Atrial Fibrillation;   Deep Vein Thrombosis;   Cardiac Valvular Insufficiency;   Coagulopathies;   Pulmonary Embolism
Interventions: Genetic: Genotype-guided;   Other: Standard-of-Care

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Study has passed its completion date and status has not been verified in more than two years.