114 studies found for:    Open Studies | "Tachycardia"
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21 Recruiting Aldosterone & Sodium Regulation in Postural Tachycardia Syndrome - Screening
Condition: Postural Tachycardia Syndrome
Interventions: Other: Autonomic Function Testing;   Other: Posture Study;   Procedure: Measurement of Total Blood Volume;   Other: Exercise Capacity Test
22 Recruiting Feasibility of Contact Force Catheter Mapping and Ablation in Epicardial and Endocardial Ventricular Tachycardias
Conditions: Ventricular Tachycardia;   Sudden Death;   Syncope;   Chest Pain
Intervention: Procedure: Catheter ablation
23 Recruiting Dietary Salt in Postural Tachycardia Syndrome
Condition: Postural Orthostatic Tachycardia Syndrome
Interventions: Radiation: Blood Volume;   Radiation: Total Blood Volume;   Procedure: Exercise Capacity Test - Bicycle;   Procedure: Posture Study
24 Recruiting Local Vasoconstriction in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Drug: Losartan;   Drug: Ascorbic Acid (Vitamin C);   Drug: Normal Saline
25 Recruiting Cognitive Dysfunction in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Behavioral: Seated Measurements;   Behavioral: Standing Measurements;   Behavioral: Self-Administered Surveys
26 Recruiting A Study of Pyridostigmine in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Drug: pyridostigmine;   Drug: Placebo
27 Recruiting Dietary Sodium's Effect on Urinary Sodium and Dopamine Excretion in Patients With Postural Tachycardia Syndrome
Condition: Postural Orthostatic Tachycardia Syndrome
Interventions: Radiation: Total Blood Volume;   Procedure: Exercise Capacity Test - Bicycle;   Procedure: Posture Study
28 Recruiting Pathophysiology of Orthostatic Intolerance
Conditions: Tachycardia;   Postural Orthostatic Tachycardia Syndrome
Interventions: Radiation: DAXOR;   Procedure: QSweat;   Drug: Intrinsic Heart Rate
29 Recruiting Adrenocorticotropic Hormone Stimulation in Postural Orthostatic Tachycardia Syndrome (POTS)
Condition: Postural Tachycardia Syndrome
Intervention: Drug: Cosyntropin administration
30 Recruiting REnal SympathetiC Denervation to sUpprEss Ventricular Tachyarrhythmias
Condition: Ventricular Tachycardia
Intervention: Device: Celsius Thermacool Catheter
31 Unknown  Using Non-Fluoroscopic Imaging Devices to Decrease Radiation Exposure During Ablation of Supraventricular Tachycardia
Condition: Supraventricular Tachycardia
Intervention: Device: Intracardiac echocardiography and 3D navigational system
32 Not yet recruiting Safety and Efficacy Aspects of a Standardized Stepwise Anatomical Approach for AVNRT Ablation
Condition: Re-entrant Atrioventricular Node Tachycardia
Intervention: Procedure: Coronary sinus / left-sided slow pathway ablation
33 Not yet recruiting Ultra-high Density Mapping With Multielectrode Catheter vs Conventional Point by Point Mapping for Ventricular Tachycardia Substrate Ablation
Condition: Ventricular Tachycardia
Interventions: Device: Ablation guided by conventional mapping.;   Device: Ablation guided by ultra-high density mapping with multielectrode catheter.
34 Recruiting Ablation of Clinical Ventricular Tachycardia Versus Addition of Substrate Ablation on the Long Term Success Rate of VT Ablation
Condition: Ventricular Tachycardia
Intervention: Procedure: Radiofrequency Catheter Ablation (RFCA)
35 Recruiting Peripheral Dopamine in Postural Tachycardia Syndrome
Conditions: Postural Tachycardia Syndrome;   Orthostatic Intolerance
Interventions: Drug: Carbidopa;   Drug: Placebo
36 Unknown  The Renin-Aldosterone Axis in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Intervention: Drug: Angiotensin II
37 Recruiting Assessment of Vascular Endothelial Function in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Intervention: Device: Blood Pressure and Blood Flow
38 Unknown  Accuracy and Safety Study of the Magnetecs CGCI System for Intracardiac Mapping
Conditions: Tachycardia, Supraventricular;   Tachycardia, Ventricular
Interventions: Procedure: Remote magnetic navigation;   Device: Magnetecs Catheter Guidance Control and Imaging system
39 Recruiting Iron Sucrose in Adolescents With Iron Deficiency and Postural Orthostatic Tachycardia Syndrome (POTS)
Condition: Postural Orthostatic Tachycardia Syndrome
Interventions: Drug: Iron infusion;   Drug: Normal saline infusion
40 Recruiting Circulating Biomarkers and Ventricular Tachyarrhythmia
Conditions: Cardiomyopathy;   Ventricular Tachycardia;   Ventricular Fibrillation
Intervention:

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Indicates status has not been verified in more than two years