43 studies found for:    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 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
3 Recruiting A Study of Pyridostigmine in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Drug: pyridostigmine;   Drug: Placebo
4 Recruiting Local Vasoconstriction in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Interventions: Drug: Losartan;   Drug: Ascorbic Acid (Vitamin C);   Drug: Normal Saline
5 Unknown  The Renin-Aldosterone Axis in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Intervention: Drug: Angiotensin II
6 Recruiting Peripheral Dopamine in Postural Tachycardia Syndrome
Conditions: Postural Tachycardia Syndrome;   Orthostatic Intolerance
Interventions: Drug: Carbidopa;   Drug: Placebo
7 Enrolling by invitation The Effect of Ivabradine on Patients With Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Intervention: Drug: ivabradine
8 Recruiting Assessment of Vascular Endothelial Function in Postural Tachycardia Syndrome
Condition: Postural Tachycardia Syndrome
Intervention: Device: Blood Pressure and Blood Flow
9 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
10 Recruiting Modafinil and Cognitive Function in POTS
Condition: Postural Tachycardia Syndrome
Interventions: Drug: Placebo;   Drug: Modafinil;   Drug: Propranolol
11 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
12 Recruiting Adrenocorticotropic Hormone Stimulation in Postural Orthostatic Tachycardia Syndrome (POTS)
Condition: Postural Tachycardia Syndrome
Intervention: Drug: Cosyntropin administration
13 Recruiting Effect of Medical Treatment and Prognosis of Postural Orthostatic Tachycardia Syndrome (POTS)
Condition: Postural Orthostatic Tachycardia Syndrome
Interventions: Drug: Propranolol;   Drug: Bisoprolol;   Drug: Propranolol+pyridostigmine;   Drug: Bisoprolol+pyridostgmine
14 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
15 Active, not recruiting Autonomic Nervous System and Chronic Fatigue Syndrome
Conditions: Chronic Fatigue Syndrome;   Orthostatic Intolerance;   Postural Tachycardia Syndrome
Interventions: Other: Autonomic Function Testing;   Other: Saline infusions;   Drug: L-NMMA trimethaphan;   Drug: methyldopa
16 Recruiting Intravenous (IV) Saline and Exercise in Postural Tachycardia Syndrome (POTS)
Condition: Postural Tachycardia Syndrome
Interventions: Drug: Saline;   Other: Placebo
17 Active, not 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
18 Recruiting EEG Characteristics in Youth POTS and/or Syncope
Conditions: Syncope;   Postural Tachycardia Syndrome;   Orthostatic Intolerance
Intervention: Device: Abdominal and lower extremity compression
19 Completed Hypnosis in Autonomic Function
Conditions: Vasovagal Syncope;   Postural Tachycardia Syndrome;   Hypnosis
Intervention:
20 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

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Indicates status has not been verified in more than two years