Local Heat Stress in Autonomic Failure Patients With Supine Hypertension
Primary Purpose
Hypertension, Pure Autonomic Failure, Multiple System Atrophy
Status
Completed
Phase
Not Applicable
Locations
United States
Study Type
Interventional
Intervention
Passive heat stress
Control (non-heating)
Sponsored by
About this trial
This is an interventional other trial for Hypertension focused on measuring Supine hypertension, Autonomic failure, Heat intolerance, Orthostatic hypotension, Heat stress
Eligibility Criteria
Inclusion Criteria:
- Male and female patients, between 18-80 yrs., with primary autonomic failure (Parkinson Disease, Multiple System Atrophy, and Pure Autonomic Failure) and supine hypertension. Supine hypertension will be defined as SBP≥150 mmHg.
- Patients able and willing to provide informed consent.
Exclusion Criteria:
- Pregnancy
- Significant cardiac, renal or hepatic illness, or with contraindications to administration of pressor agents or with other factors, which in the investigator's opinion would prevent the subject from completing the protocol including clinically significant abnormalities in clinical, mental or laboratory testing.
Sites / Locations
- Vanderbilt University
Arms of the Study
Arm 1
Arm 2
Arm Type
Experimental
Sham Comparator
Arm Label
Local Heat Stress
Control (Non-heating)
Arm Description
Passive heat-stress using a commercial heating pad applied over the abdomen and part of the torso
Commercial heating pad applied over the abdomen and part of the torso but turned off
Outcomes
Primary Outcome Measures
Change in Systolic Blood Pressure
Change from baseline in systolic blood pressure at 2 hr post-intervention
Secondary Outcome Measures
Percent Change in Hemodynamic Parameters (Cardiac Output, Stroke Volume and Systemic Vascular Resistance)
Percent change from baseline ([post-intervention - baseline]/baseline X 100) in cardiac output, stroke volume and systemic vascular resistance at 2 hours post-intervention
Full Information
NCT ID
NCT02417415
First Posted
April 10, 2015
Last Updated
December 25, 2021
Sponsor
Vanderbilt University
1. Study Identification
Unique Protocol Identification Number
NCT02417415
Brief Title
Local Heat Stress in Autonomic Failure Patients With Supine Hypertension
Official Title
Local Heat Stress in Autonomic Failure Patients With Supine Hypertension
Study Type
Interventional
2. Study Status
Record Verification Date
December 2021
Overall Recruitment Status
Completed
Study Start Date
April 2015 (Actual)
Primary Completion Date
February 2021 (Actual)
Study Completion Date
February 2021 (Actual)
3. Sponsor/Collaborators
Responsible Party, by Official Title
Principal Investigator
Name of the Sponsor
Vanderbilt University
4. Oversight
Data Monitoring Committee
No
5. Study Description
Brief Summary
Patients with autonomic failure are characterized by disabling orthostatic hypotension (low blood pressure on standing), and at least half of them also have high blood pressure while lying down (supine hypertension). Exposure to heat, such as in hot environments, often worsens their orthostatic hypotension. The causes of this are not fully understood. The purpose of this study is to evaluate whether applying local heat over the abdomen of patients with autonomic failure and supine hypertension would decrease their high blood pressure while lying down. This will help us better understand the mechanisms underlying this phenomenon, and may be of use in the treatment of supine hypertension.
Detailed Description
Primary autonomic failure is a neurodegenerative condition characterized by severe impairment of the autonomic nervous system. The clinical hallmark of autonomic failure is disabling orthostatic hypotension, but at least half of patients are also hypertensive while lying down. This supine hypertension can be severe and associated with end-organ damage and worsening of orthostatic hypotension due to increased pressure natriuresis. It also complicates the management of these patients by limiting the use of daytime pressor agents for the treatment of orthostatic hypotension.
It is well known that heat exposure (e.g. hot weather or a hot bath or shower) produces an acute and temporary worsening of orthostatic hypotension in autonomic failure patients. However, the mechanisms underlying this phenomenon are completely unexplored. Factors that may predispose autonomic failure patients to the acute lowering blood pressure effects of heat stress include 1) impaired heat dissipation due to inability to sweat, 2) preserved heat-mediated skin vasodilation, and 3) blunted sympathetic hemodynamic responses to maintain blood pressure. In this study, we test the hypothesis that moderate levels of local (abdominal) passive heat stress will lower blood pressure in autonomic failure patients with supine hypertension.
To test this hypothesis, we propose this pilot study with the following specific aims:
To evaluate the acute blood pressure effects of local passive heat stress in autonomic failure patients with supine hypertension, we will compare changes in BP between controlled local heat stress (~44ºC) using a commercial heating pad that covers the abdomen and part of the torso, and a control (non-heating) study day using the same heating pad but turned off.
To evaluate the mechanisms underlying BP changes during local heat stress, we will compare changes in hemodynamic parameters (cardiac output, stroke volume and peripheral vascular resistance), segmental fluid shifts (measured by segmental bioimpedance), skin blood flow and skin temperature between the heat and non-heating study days.
6. Conditions and Keywords
Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Hypertension, Pure Autonomic Failure, Multiple System Atrophy, Autonomic Failure
Keywords
Supine hypertension, Autonomic failure, Heat intolerance, Orthostatic hypotension, Heat stress
7. Study Design
Primary Purpose
Other
Study Phase
Not Applicable
Interventional Study Model
Crossover Assignment
Model Description
randomized, 2-arm crossover study (heat vs. sham)
Masking
Participant
Masking Description
Patients were blinded to the intervention
Allocation
Randomized
Enrollment
22 (Actual)
8. Arms, Groups, and Interventions
Arm Title
Local Heat Stress
Arm Type
Experimental
Arm Description
Passive heat-stress using a commercial heating pad applied over the abdomen and part of the torso
Arm Title
Control (Non-heating)
Arm Type
Sham Comparator
Arm Description
Commercial heating pad applied over the abdomen and part of the torso but turned off
Intervention Type
Other
Intervention Name(s)
Passive heat stress
Other Intervention Name(s)
Heating pad
Intervention Description
Passive heat stress will be applied with a commercial heating pad that covers all the abdomen and part of the torso to provide local heating at ~44ºC continuously for 2 hr.
Intervention Type
Other
Intervention Name(s)
Control (non-heating)
Other Intervention Name(s)
sham
Intervention Description
Heating pad will be applied over the abdomen and part of the torso but it will be turned off.
Primary Outcome Measure Information:
Title
Change in Systolic Blood Pressure
Description
Change from baseline in systolic blood pressure at 2 hr post-intervention
Time Frame
2 hours of heat stress or sham
Secondary Outcome Measure Information:
Title
Percent Change in Hemodynamic Parameters (Cardiac Output, Stroke Volume and Systemic Vascular Resistance)
Description
Percent change from baseline ([post-intervention - baseline]/baseline X 100) in cardiac output, stroke volume and systemic vascular resistance at 2 hours post-intervention
Time Frame
2 hours of heat stress or sham
10. Eligibility
Sex
All
Minimum Age & Unit of Time
18 Years
Maximum Age & Unit of Time
80 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
Inclusion Criteria:
Male and female patients, between 18-80 yrs., with primary autonomic failure (Parkinson Disease, Multiple System Atrophy, and Pure Autonomic Failure) and supine hypertension. Supine hypertension will be defined as SBP≥150 mmHg.
Patients able and willing to provide informed consent.
Exclusion Criteria:
Pregnancy
Significant cardiac, renal or hepatic illness, or with contraindications to administration of pressor agents or with other factors, which in the investigator's opinion would prevent the subject from completing the protocol including clinically significant abnormalities in clinical, mental or laboratory testing.
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Italo Biaggioni, MD
Organizational Affiliation
Vanderbilt University
Official's Role
Principal Investigator
Facility Information:
Facility Name
Vanderbilt University
City
Nashville
State/Province
Tennessee
ZIP/Postal Code
37232
Country
United States
12. IPD Sharing Statement
Citations:
PubMed Identifier
33739123
Citation
Okamoto LE, Celedonio JE, Smith EC, Gamboa A, Shibao CA, Diedrich A, Paranjape SY, Black BK, Muldowney JAS 3rd, Peltier AC, Habermann R, Crandall CG, Biaggioni I. Local Passive Heat for the Treatment of Hypertension in Autonomic Failure. J Am Heart Assoc. 2021 Apr 6;10(7):e018979. doi: 10.1161/JAHA.120.018979. Epub 2021 Mar 19.
Results Reference
derived
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Local Heat Stress in Autonomic Failure Patients With Supine Hypertension
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