Hemodynamic Mechanisms of Abdominal Compression in the Treatment of Orthostatic Hypotension in Autonomic Failure

Multiple System Atrophy Clinical Trial

Official title: Hemodynamic Mechanisms of Abdominal Compression in the Treatment of Orthostatic Hypotension in Autonomic Failure

Status Recruiting

Clinical Trial Summary

Compression garments have been shown to be effective in the treatment of orthostatic hypotension in autonomic failure patients. The purpose of this study is to determine the hemodynamic mechanisms by which abdominal compression (up to 40 mm Hg) improve the standing blood pressure and orthostatic tolerance in these patients, and to compare them with those of the standard of care midodrine. The investigators will test the hypothesis that abdominal compression will blunt the exaggerated fall in stroke volume and the increase in abdominal vascular volume during head up tilt.

Clinical Trial Description

Patients with autonomic failure are characterized by disabling orthostatic hypotension (low blood pressure on standing) due to severe impairment of the autonomic nervous system. Compression garments such as waist-high stockings and abdominal binders have been shown to improve orthostatic hypotension in these patients. The purpose of this study is to determine the hemodynamic mechanisms by which abdominal compression (up to 40 mm Hg) improve the standing blood pressure and orthostatic tolerance in these patients, and to compare them with those of the standard of care midodrine. The investigators will test the hypothesis that abdominal compression will blunt the exaggerated fall in stroke volume and the increase in abdominal vascular volume during head up tilt. This study will help us better understand the contribution of the abdominal veins to orthostatic hypotension and the mechanisms underlying this non-pharmacological therapeutic approach. Participants will be studied in a tilt table in two separate days in a randomized, crossover fashion with sham abdominal compression (~5 mmHg) and active compression (~40 mmHg). ;

Related Conditions & MeSH terms

• Autonomic Failure
• Hypotension
• Hypotension, Orthostatic
• Multiple System Atrophy
• Orthostatic Hypotension
• Pure Autonomic Failure
• Shy-Drager Syndrome

• NCT number: NCT02429557
• Study type: Interventional
• Source: Vanderbilt University Medical Center
• Contact: Bonnie K Black, RN
• Phone: 615-343-6862
• Email: autonomics@vumc.org
• Status: Recruiting
• Phase: Phase 1
• Start date: April 2015
• Completion date: December 1, 2024