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43 studies found for:    Open Studies | "Orthostatic Intolerance"
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21 Recruiting Blood Pressure Lowering Effects of Angiotensin-(1-7) in Primary Autonomic Failure
Conditions: Autonomic Nervous System Disorders;   Pure Autonomic Failure;   Shy-Drager Syndrome;   Orthostatic Hypotension, Dysautonomic
Interventions: Drug: Angiotensin-(1-7);   Drug: Saline
22 Recruiting POTS Adrenergic Ab (CIHR Aims #1&2)
Condition: Postural Tachycardia Syndrome
Interventions: Drug: Phenylephrine;   Drug: Isoproterenol
23 Recruiting Transdermal Vagal Stimulation for POTS
Condition: Postural Orthostatic Tachycardia Syndrome
Interventions: Other: Stimulation;   Other: Placebo
24 Recruiting A Study of Pyridostigmine in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Drug: pyridostigmine;   Drug: Placebo
25 Not yet recruiting Second Study on Cardio-neuromodulation in Humans
Conditions: Cardiac Disease;   Syncope;   Syncope, Vasovagal;   Sick Sinus Syndrome
Intervention: Device: radio-frequency ablation (nMARQ™ or Smart Touch™ catheter)
26 Not yet recruiting Relation Between Vasovagal Tendency and Smoking Among University Students
Conditions: Vasovagal Syncope;   Smoke Inhalation
Intervention: Behavioral: Comparison between two groups
27 Not yet recruiting Treatment of Post-SCI Hypotension
Conditions: Spinal Cord Injury;   Autonomic Dysreflexia;   Orthostatic Hypotension;   Baroreceptor Integrity;   Sympathetic Integrity;   Vagal Integrity;   Hypotension;   Cerebral Blood Flow;   Blood Pressure;   Venous Occlusion Plethysmography
Intervention: Drug: Midodrine Hydrochloride
28 Recruiting Effects of Midodrine and Droxidopa on Splanchnic Capacitance in Autonomic Failure
Conditions: Autonomic Failure;   Pure Autonomic Failure;   Multiple System Atrophy;   Parkinson Disease;   Orthostatic Hypotension
Interventions: Drug: Droxidopa;   Drug: Midodrine;   Drug: Placebo
29 Recruiting A Proof of Principal Study of Atomoxetine for the Prevention of Vasovagal Syncope
Condition: Syncope, Vasovagal
Interventions: Drug: Atomoxetine;   Drug: Matching Placebo
30 Recruiting Reduction in Splanchnic Capacitance Contributes to Sympathetically Dependent Hypertension in Autonomic
Conditions: Multiple System Atrophy;   Orthostatic Hypotension;   Supine Hypertension
Interventions: Drug: Trimethaphan;   Drug: Placebo
31 Recruiting Observation of ImageReady™ MR Conditional Pacing System in China
Conditions: Arhythmia;   Atrioventricular Heart-block;   Chronic Bundle Branch or Branch Block;   Carotid Sinus Hypersensitivity Reaction Syndrome;   Vasovagal Syncope
Intervention: Device: ImageReady™ MR Conditional Pacing System
32 Recruiting Prevention of Syncope Trial 6 - Atomoxetine in Vasovagal Syncope
Condition: Vasovagal Syncope
Interventions: Drug: Atomoxetine;   Drug: Placebo
33 Recruiting Hemodynamic Mechanisms of Abdominal Compression in the Treatment of Orthostatic Hypotension in Autonomic Failure
Conditions: Orthostatic Hypotension;   Pure Autonomic Failure;   Multiple System Atrophy;   Autonomic Failure
Interventions: Other: Abdominal compression;   Other: Sham abdominal compression;   Drug: Placebo pill;   Drug: midodrine
34 Recruiting Heart Rate Variability and Orthostatic Hypotension in Stroke Patients Evaluated by Intelligent Biosensor System
Condition: Cerebrovascular Accident
Intervention:
35 Recruiting Benefit of Dual-chamber Pacing With Closed Loop Stimulation (CLS) in Tilt-induced Cardioinhibitory Reflex Syncope
Condition: Syncope
Interventions: Device: DDD-CLS;   Device: ODO
36 Recruiting Clinical Autonomic Disorders: A Training Protocol
Conditions: Chronic Fatigue Syndrome;   Pseudopheochromocytoma;   Healthy Volunteers;   Neurocardiogenic Syncope;   Postural Tachycardia Syndrome
Intervention:
37 Recruiting Syncope Prediction Study
Condition: Vasovagal Syncope
Intervention:
38 Recruiting Assessment of Metoprolol in the Prevention of Vasovagal Syncope in Aging Subjects
Condition: Vasovagal Syncope
Interventions: Drug: Metoprolol;   Drug: Matching Placebo
39 Recruiting Efficacy of L-threo DOPS on Orthostatic Hypotension Symptoms and Other Non-motor Symptoms in Patients With MSA
Condition: Multiple System Atrophy
Interventions: Drug: L-Threo DOPS;   Drug: placebo
40 Recruiting Essential Hypotension and Adaptability Registry
Conditions: Blood Pressure;   Depression;   Panic Attack;   Fibromyalgia;   POTS;   Inappropriate Sinus Tachycardia;   Coronary Heart Disease;   Acute Coronary Syndrome (ACS);   Acute Myocardial Infarction (AMI);   Cerebrovascular Disease (CVD);   Transient Ischemic Attack (TIA);   Atrial Fibrillation;   Diabetes Mellitus;   Cancer;   Systolic Heart Failure;   Diastolic Heart Failure;   Chronic Fatigue Syndrome;   Syncope;   Vasovagal Syncope
Intervention:

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