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Found 25 studies with search of: Postural Tachycardia Syndrome
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1 Recruiting Cognitive Dysfunction in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Behavioral: Seated Measurements;   Behavioral: Standing Measurements;   Behavioral: Self-Administered Surveys
2 Recruiting A Study of Pyridostigmine in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Drug: pyridostigmine;   Drug: Placebo
3 Recruiting Local Vasoconstriction in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Drug: Losartan;   Drug: Ascorbic Acid (Vitamin C);   Drug: Normal Saline
4 Unknown † The Renin-Aldosterone Axis in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Intervention: Drug: Angiotensin II
5 Recruiting Peripheral Dopamine in Postural Tachycardia Syndrome
Conditions: Postural Tachycardia Syndrome;   Orthostatic Intolerance
Interventions: Drug: Carbidopa;   Drug: Placebo
6 Recruiting Assessment of Vascular Endothelial Function in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Intervention: Device: Blood Pressure and Blood Flow
7 Recruiting Breathing Device in Postural Orthostatic Tachycardia Syndrome (POTS)
Conditions: Postural Tachycardia Syndrome;   Postural Orthostatic Tachycardia Syndrome
Interventions: Device: Inspiratory Threshold Device (Res-Q-Gard ITD);   Device: Sham Inspiratory Threshold Device
8 Active, not recruiting Renal Salt Handling in Postural Tachycardia Syndrome Following Dietary Dopa Administration
Condition: Postural Tachycardia Syndrome
Intervention: Biological: Fava beans
9 Recruiting Autonomic Nervous System and Chronic Fatigue Syndrome
Conditions: Chronic Fatigue Syndrome;   Orthostatic Intolerance;   Postural Tachycardia Syndrome
Interventions: Other: Autonomic Function Tests;   Other: Saline infusions;   Drug: L-NMMA trimethaphan;   Drug: methyldopa
10 Recruiting Intravenous (IV) Saline and Exercise in Postural Tachycardia Syndrome (POTS)
Condition: Postural Tachycardia Syndrome
Interventions: Drug: Saline;   Other: Placebo
11 Recruiting Sleep Actigraphy in Postural Tachycardia Syndrome (POTS)
Conditions: Postural Tachycardia Syndrome;   Orthostatic Intolerance;   Sleep Disorders
Intervention: Device: Actigraphy Watch (motion sensors) with light sensors - ActiWatch from Minimitter
12 Completed Hypnosis in Autonomic Function
Conditions: Vasovagal Syncope;   Postural Tachycardia Syndrome;   Hypnosis
Intervention:
13 Unknown † Autonomic Profiles in Pediatric Patients With Cyclic Vomiting Syndrome (CVS), Irritable Bowel Syndrome (IBS),Postural Orthostatic Tachycardia Syndrome (POTS), Functional Abdominal Pain (FAP) or Chronic Nausea
Conditions: Vomiting Syndrome;   Irritable Bowel Syndrome;   Postural Orthostatic Tachycardia Syndrome;   Abdominal Pain;   Chronic Nausea
Intervention:
14 Recruiting Head Circumference Growth in Children With Ehlers-Danlos Syndrome Who Develop Dysautonomia Later in Life
Conditions: Ehlers Danlos Syndrome;   External Hydrocephalus;   Dysautonomia;   Postural Orthostatic Tachycardia Syndrome;   Venous Insufficiency
Intervention:
15 Recruiting Objective Sleep Disturbances in Orthostatic Intolerance
Conditions: Postural Tachycardia Syndrome;   Chronic Orthostatic Intolerance
Intervention: Procedure: Polysomnography
16 Unknown † Dopamine in Orthostatic Tolerance
Condition: Postural Tachycardia Syndrome
Intervention: Dietary Supplement: dietary sodium
17 Recruiting Effect of Exercise in OI
Conditions: Orthostatic Intolerance;   Postural Tachycardia Syndrome
Interventions: Drug: Propanolol;   Drug: Placebo
18 Active, not recruiting Acute Salt Handling in Orthostatic Intolerance
Conditions: Postural Tachycardia Syndrome;   Orthostatic Tachycardia;   Orthostatic Intolerance
Intervention: Other: normal saline (0.9%)
19 Unknown † Cardiovascular Effects of Selective I(f)-Channel Blockade
Condition: Postural Orthostatic Tachycardia Syndrome
Interventions: Drug: beta-blocker (Metoprolol);   Drug: I(f)-blocker (ivabradine);   Drug: Placebo
20 Recruiting Pathophysiology of Orthostatic Intolerance
Conditions: Tachycardia;   Postural Orthostatic Tachycardia Syndrome
Interventions: Radiation: DAXOR;   Procedure: QSweat;   Drug: Intrinsic Heart Rate

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† Indicates status has not been verified in more than two years
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