Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Rheos Feasibility Trial

This study has been completed.
Information provided by (Responsible Party):
CVRx, Inc. Identifier:
First received: February 25, 2010
Last updated: October 18, 2016
Last verified: October 2016
The Rheos Feasibility Trial is designed to assess safety, device performance, and protocol parameters of the CVRx Rheos Baroreflex Therapy in patients with severe hypertension that are refractory to full drug therapy.

Condition Intervention Phase
Device: Implantation of the Rheos System
Other: Standard of care medical management
Phase 2

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Rheos Feasibility Trial- A Study of Baroreflex Hypertension TherapyTM in Refractory Hypertension

Further study details as provided by CVRx, Inc.:

Primary Outcome Measures:
  • Rheos Feasibility Study [ Time Frame: 13 months ]

    To summarize the efficacy of the Rheos System by estimating the reduction of systolic blood pressure associated with activation of the Rheos System at 4 and 13 months post implant when compared to baseline (1-month post implant).

    To describe the safety of the Rheos System by summarizing all system related adverse events and estimating the serious sytem related event-free rate through 4 and 13 months post-implant.

Enrollment: 16
Study Start Date: January 2005
Study Completion Date: October 2010
Primary Completion Date: December 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Rheos Device Device: Implantation of the Rheos System
Open label
Active Comparator: Medical Management Other: Standard of care medical management
Patients will continue with medical therapy for standard of care of their hypertension.


Ages Eligible for Study:   21 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Be at least 21 years of age.
  2. Have been assessed to have bilateral carotid bifurcations located at or below C3-C4.
  3. Have an office cuff systolic blood pressure greater than or equal to 160 mmHg and a 24-hour ambulatory systolic blood pressure greater than or equal to 150 mmHg despite at least one month of full therapy with at least three (3) anti-hypertensive medications, of which at least one (1) must be a diuretic.
  4. Must be certified by the investigator hypertension specialist as compliant with taking full doses of medication.
  5. Have signed a CVRx approved informed consent for participation in this study.

Exclusion Criteria:

  1. Have been diagnosed with:

    • Baroreflex failure
    • Cardiac bradyarrhythmias
    • Chronic atrial fibrillation
  2. Had a heart transplant
  3. Have carotid atherosclerosis producing a 50% or greater reduction in linear diameter as determined by ultrasound or angiographic evaluation as determined within six months of enrollment in the trial.
  4. Have Grade C ulcerative plaques in the carotid artery as determined by ultrasound or angiographic evaluation.
  5. Have prior surgery or radiation in either carotid sinus region.
  6. Currently have implanted electrical medical devices such as cardiac pacing, defibrillation or neurologic stimulation systems.
  7. Are pregnant or contemplating pregnancy during the 13-month follow-up period.
  8. Currently undergoing dialysis.
  9. Have hypertension secondary to a treatable cause.
  10. Have clinically significant cardiac valvular disease.
  11. Are unable or unwilling to fulfill the protocol medication compliance and follow-up requirements.
  12. Are unlikely to survive the protocol follow-up period.
  13. Are enrolled in another concurrent clinical trial.

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

No Contacts or Locations Provided
  More Information

Responsible Party: CVRx, Inc. Identifier: NCT01077180     History of Changes
Other Study ID Numbers: 360005-001
Study First Received: February 25, 2010
Last Updated: October 18, 2016

Additional relevant MeSH terms:
Vascular Diseases
Cardiovascular Diseases processed this record on April 24, 2017