| Not Yet Recruiting | Continuous and Non-invasive Measurements by Task Force® CORE/CARDIO in Autonomic Function Testing (AFT) NCT05977335 | CNSystems Medizintechnik GmbH | — |
| Recruiting | Effects of Age, Sex and Isometric Exercise on Ventricular-Vascular Interactions During Cardiac Unloading NCT06939153 | Tracy Baynard | N/A |
| Recruiting | The STAND-UP Study NCT07195903 | St. Francis Hospital, New York | N/A |
| Recruiting | Autonomic Dysfunction in Patients Following Bariatric Surgery: The ADiPOSE Study NCT06289413 | Kansas City Heart Rhythm Research Foundation | — |
| Unknown | Influence of RIC on the Orthostatic Competence of the Microcirculation NCT05990907 | ISAR Klinikum | N/A |
| Recruiting | Postural Sway and Counterpressure Maneuvers for Pediatric Syncope NCT05633693 | Simon Fraser University | N/A |
| Completed | The Effects of Medication Induced Blood Pressure Reduction on Cerebral Hemodynamics in Hypertensive Frail Elde NCT05529147 | Radboud University Medical Center | — |
| Recruiting | Paediatric Syncope in the Emergency Department NCT05555771 | Dr. Victoria Claydon | N/A |
| Recruiting | Hypercapnia and Orthostatic Tolerance in Postural Orthostatic Tachycardia Syndrome NCT04271878 | University of Calgary | N/A |
| Completed | POTS-CFS Study: Orthostatic Intolerance in the Context of Pediatric ME/CFS NCT06054958 | Technical University of Munich | — |
| Unknown | Orthostatic Intolerance and Hypotension After Administration of Morphine in Patients Prior to Hip or Knee Arth NCT04902222 | Copenhagen University Hospital, Hvidovre | — |
| Unknown | Pathophysiologic Hemodynamics After Primary Unilateral Total Hip Arthroplasty in Patients Receiving ACEIs and NCT04842058 | Hvidovre University Hospital | — |
| Unknown | Postoperative Incidence of Orthostatic Intolerance and Hypotension in Primary Unicompartmental Knee Arthroplas NCT04195360 | Copenhagen University Hospital, Hvidovre | — |
| Unknown | Long-term Effects of Transcutaneous Vagal Nerve Stimulation on Postural Orthostatic Tachycardia Syndrome (POTS NCT04632134 | Istituto Clinico Humanitas | N/A |
| Unknown | Lower Body Muscle Pre-activation in Initial Orthostatic Hypotension NCT03970551 | University of Calgary | N/A |
| Unknown | Pathophysiologic Hemodynamics After Primary Unilateral Total Hip Arthroplasty (THA) NCT03759574 | Hvidovre University Hospital | — |
| Completed | Postoperative Orthostatic Intolerance and Hypotension in Unilateral TKA NCT03743116 | Hvidovre University Hospital | — |
| Terminated | Orthostatic Intolerance After Bariatric Surgery NCT03808740 | Vanderbilt University Medical Center | Phase 1 |
| Completed | Cardiovagal Baroreflex Deficits Impair Neurovascular Coupling and Cognition in POTS NCT03261570 | New York Medical College | EARLY_Phase 1 |
| Completed | Vitamin D Deficiency and Dysautonomia NCT03032328 | Wake Forest University Health Sciences | N/A |
| Enrolling By Invitation | Autoimmune Basis for Postural Tachycardia Syndrome NCT02725060 | Vanderbilt University Medical Center | N/A |
| Completed | EEG Characteristics in Youth POTS and/or Syncope NCT02167412 | Nationwide Children's Hospital | — |
| Unknown | Treatment of Orthostatic Intolerance in Patients With Parkinson's Disease Using Midodrine NCT02365012 | Corporal Michael J. Crescenz VA Medical Center | N/A |
| Completed | Blood Pressure and Brain Blood Flow Regulation After Midodrine Administration in Those With Spinal Cord Injury NCT01498809 | University of British Columbia | — |
| Terminated | Hemodynamic Response of Neuropathic And Non-Neuropathic POTS Patients To Adrenoreceptor Agonist And Antagonist NCT03070730 | Beth Israel Deaconess Medical Center | Phase 1 / Phase 2 |
| Completed | Effect of Exercise in OI NCT00770484 | Vanderbilt University | N/A |
| Active Not Recruiting | Sleep Actigraphy in Postural Tachycardia Syndrome (POTS) NCT00692471 | Satish R. Raj | — |
| Completed | Peripheral Dopamine in Postural Tachycardia Syndrome NCT00685919 | Vanderbilt University | Phase 2 / Phase 3 |
| Completed | Autonomic Nervous System and Chronic Fatigue Syndrome NCT00580619 | Vanderbilt University | Phase 1 |
| Active Not Recruiting | Acute Salt Handling in Orthostatic Intolerance NCT00581633 | Vanderbilt University | N/A |
| Completed | Sex Hormones and Orthostatic Tolerance NCT01153581 | Yale University | Phase 2 |
| Terminated | Treatment of Orthostatic Hypotension NCT00581477 | Vanderbilt University | Phase 2 / Phase 3 |
| Completed | The Pathophysiology of Orthostatic Hypotension NCT00748059 | Vanderbilt University Medical Center | Phase 1 |