Relevance of Flavanols for Cardiovascular Function in End-Stage Renal Disease (ESRD)

September 22, 2015 updated by: RWTH Aachen University

Relevance of Flavanols for Cardiovascular Function in End-Stage Renal Disease, a Phase 2 Study

In this study, the acute and long-term effects of flavanols on vascular function in patients with ESRD will be investigated.

Study Overview

Status

Withdrawn

Conditions

Intervention / Treatment

Detailed Description

In order to assess potential acute beneficial effects of flavanols in patients with ESRD, 10 patients undergoing dialysis will be recruited. Subjects will receive a cocoa drink with 16 mg, 250 mg, and 500 mg (in 100 mL water each) flavan-3-ols (40% epicatechine/catechine und 60% procyanidine), respectively, on three consecutively days. The functional/hemodynamic parameters (flowmediated dilation (FMD), venous-occlusion-plethysmography (VOP), blood pressure, heart rate), the biochemical marker of the circulating NO pool (nitrite, nitrate, RNOs), and the plasma levels of flavanols (epicatechine and catechine) will be determined before and after ingestion of the respective cocoadrink.

It is expected that flavanols dose-dependently improve vascular function and that this is associated with an increase in the circulating NO pool.

In order to assess long-term effects of flavanols on vascular function in patients with ESRD.

To characterize potential vascular long-term effects of flavanols in patients with ESRD, a placebo-controlled double-blinded randomized control study will be performed in 40 patients randomized in two groups. Patients will daily receive either a flavanol-poor cocoa drink or a flavanol-rich cocoa drink over a period of three months.

The flavanol-dosis that is necessary to affect vascular function will be assessed as described above. At the beginning of the study, after the first intake of the cocoa (in order to identify nonresponders) and monthly for a period of three months the vascular function will be assessed applying innovative imaging techniques to the brachial artery to assess endothelium-dependent regulation of physicomechanical properties and vascular tone and thus blood flow at the level of the macrocirculation. In parallel new techniques will be applied to assess perfusion at the level of the microcirculation. In particular, measurement of flow-mediated dilation, intima-media-thickness,compliance and stiffness indices will be performed in the macrocirculation of the brachial artery.

Considering the microcirculation, new diagnostic approaches such as Laser-Doppler Flow and peripheral arterial tonometry next to diagnostic approaches such as the venous occlusive plethysmography will be performed. Moreover, the circulating NO pool, markers of inflammation and of oxidative stress, the uremic toxin pcresol and the plasma levels of flavanols will be determined. The exams after month 1, 2, and 3 will be performed in the morning before intake of the cocoa drink. In order to examine potential sustained effects, an additional examination day will take place after 4 month (one month after stopping the flavanol-intake). It is expected that the flavanol-rich cocoa will improve vascular function, which is associated with an increase in the circulating NO-pool and a decrease in inflammatory markers and the marker for oxidative stress.

Study Type

Interventional

Phase

  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Germany
      • Düsseldorf, Germany
        • Düsseldorf University Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

16 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • patients with end stage renal disease

Exclusion Criteria:

  • person under 18 years of age
  • participation in another study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: 1
Treatment with low dose flavanoids
Dietary supplement: low and high dose flavanoids
treatment with flavanoid-rich or flavanoid-low cacao twice daily
Experimental: 2
Treatment with high dose flavanoids
Dietary supplement: low and high dose flavanoids
treatment with flavanoid-rich or flavanoid-low cacao twice daily

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Vascular function
Time Frame: before treatment, directly after treatment and 3, resp. 4 months afterwards
before treatment, directly after treatment and 3, resp. 4 months afterwards

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

RWTH Aachen University

Collaborators

Heinrich-Heine University, Duesseldorf

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Registration Dates

First Submitted

February 3, 2009

First Submitted That Met QC Criteria

February 3, 2009

First Posted (Estimate)

February 4, 2009

Study Record Updates

Last Update Posted (Estimate)

September 23, 2015

Last Update Submitted That Met QC Criteria

September 22, 2015

Last Verified

September 1, 2015

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • ESRD-Study

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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