Decreasing Intakes & Absorption of Phosphorus in Haemodialysis Patients Through Food Choices (DIP HD)

January 15, 2020 updated by: Joseph Eustace, University College Cork

Based on new evidence renal dietitians in Ireland are revising the diet sheet that is used to teach patients about reducing blood phosphate. Changes that renal dietitians plan to make to the dietary phosphorus prescription

  • Inclusion of some nuts and pulses
  • More detailed education re phosphate additives
  • More accurate protein prescription
  • Inclusion of more whole grains
  • Encouraging the use of foods with a low phosphorus to protein ratio

The investigators want to test the two diet prescription to find out, which one is better at reducing blood phosphate and which one is more acceptable to patients. The investigators also want to make sure it is safe.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Background:

Chronic Kidney Disease (CKD) afflicts one in twenty Irish citizens who are over age 45 and is a significant risk factor for cardiovascular disease, premature death and significantly impacts healthcare utilisation. As kidney function deteriorates, phosphorus, upregulates counter regulatory hormones (immunoreactive Parathyroid Hormone (iPTH) and Fibroblast Growth Factor 23 (FGF23), the elevated levels of which are maladaptive. Collectively these abnormalities and their complications are referred to as Chronic Kidney Disease, Mineral & Bone Disorder (CKD MBD). Hyperphosphataemia or high blood phosphate levels is associated with increased mortality, in dialysis patients, in the earlier stages of CKD and even in patients with normal renal function. The use of phosphorus restricted diets in combination with oral phosphate binders has become well established in the management of patients with CKD stages 3-5 (including CKD stage 5D).

Experts have called for research into the dietary management of phosphate in the CKD population. The current evidence base is weak and in a recent Cochrane systematic review the authors concluded that there was limited low quality evidence to indicate that dietary interventions may positively affect CKD-MBD.

In recent years there has been increased focus on dietary phosphorus restriction in the management of CKD-MBD and a number of experts have suggested changes in how we manage dietary phosphorus. Several potential strategies have been suggested and in response the Renal Interest Group (RIG) of the Irish Nutrition & Dietetic Institute (INDI) held a 1 day meeting in Dublin in January 2015 which brought together numerous experts in the field to summarise our current understanding and the recent advances in the field.

Following on from this, RIG set up a working group to translate the new knowledge from the advanced study day and from further literature reviews into a modified low phosphate diet sheet.

Almost all people who have end stage kidney disease (ESKD) and require dialysis to survive, follow a dietary phosphorus restriction, to control high blood phosphate, with the aim of reducing the risk of cardiovascular disease, fractures and death.

Research Hypothesis: The modified low phosphate diet sheet is superior to current treatment in haemodialysis patients

Study Objectives

Primary Objective: To determine if the modified low phosphorus dietary prescription is superior to current management in reducing serum phosphate levels in HD patients

Secondary Objectives To determine if the modified low phosphorus diet is tolerable To determine if the modified low phosphorus diet is safe To determine if the modified low phosphorus diet brings the renal diet closer to healthy eating advice e.g. increased fibre intake.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
74

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

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

  • Ireland
      • Cavan, Ireland, H12 K845
        • Cavan General Hospital
      • Cork, Ireland, T12DC4A
        • Fiona Byrne
      • Dublin, Ireland, D04 T6F4
        • St. Vincents University Hospital
      • Dublin, Ireland, D07 R2WY
        • Mater Misericordia University Hospital
      • Dublin, Ireland, D09 C562
        • Beaumont Hospital
      • Dublin, Ireland, D24 NR0A
        • Tallaght Hospital
      • Galway, Ireland
        • Galway University Hospitals
      • Limerick, Ireland, V94 F858
        • University Hospital Limerick
      • Mayo, Ireland, F23 H529
        • Mayo University Hospital
    • Offaly
      • Tullamore, Offaly, Ireland, R35 NY51
        • Midland Regional Hospital Tullamore

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • >18 years
  • Self reported urine output less than 2 cups (400mls) / day
  • On maintenance haemodialysis for > 3 months
  • Phosphate >1.6mmole/L on average of last 3 available routine monthly blood tests

Exclusion Criteria:

  • Hyperkalemia, defined as a predialysis serum K on routine monthly blood test of >6mmoles/l in the month preceding the trial.
  • Parathyroidectomy
  • Corrected serum calcium <2.2 or > 2.6mmol/L or local normal units where ranges varied significantly from 2.2-2.6mmoles/l.
  • Acute concurrent illness, requiring hospitalisation in the 2 weeks prior to recruitment.

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: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: Standard Care Arm
Patients randomised to the standard care arm will be re educated using the current low phosphorus diet prescription.
Other: Current Low Phosphorus Diet Prescription

Routine / Standard Care: Routine dietary intervention is currently provided by one-to-one counselling to the subject and his/her relevant family members or carers, by a state registered dietitian regarding a diet which provides <15mg Phosphorus /g Protein (over the day). This is equivalent to approximately 1000mg P / day. This is based on the 'Eating Well with Kidney Disease' dietsheet produced by the Renal Interest Group (RIG) of the Irish Nutrition & Dietetic Institute (INDI) in 2010 and includes following main components:

  • Restricting protein intake to requirements (1-1.2g/kg Ideal Body Weight)
  • Restricting dairy intake (1-1.5 portions per day)
  • Avoiding foods high in phosphate
  • Avoiding foods with phosphate additives
Experimental: Modified Intervention Arm
Patients randomised to the intervention arm will be educated using a modified low phosphorus diet prescription.
Other: Modified Low Phosphorus Diet Prescription

Modified Low Phosphorus Diet Prescription: The new prescription recommends five changes to current management

  • Introduction of some plant protein in the form of pulses and nuts where the phosphorus is largely bound by phytate
  • Increased focus on avoiding additives
  • Introduction of more whole grains e.g. wholemeal sliced pan/ pasta/rice .
  • Avoiding over-prescription of protein which carries an obligatory phosphorus load.
  • Focus on high protein foods with a low phosphorus to protein ratio

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Serum Phosphate
Time Frame: 1 month
Difference in serum phosphate value at 1 month v baseline, in those randomised to the modified diet compared to the difference in serum phosphate value at 1 month v baseline in those randomised to standard care.
1 month

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Dietary Intake
Time Frame: 1 month

Between arm difference in dietary phosphate intake (separating phosphate into high & low bioavailability).

Between arm difference in dietary fibre intake.
1 month
Serum iPTH
Time Frame: 1 month
Difference in serum iPTH value at 1 month v baseline, in those randomised to the modified diet compared to the difference in serum iPTH value at 1 month v baseline in those randomised to standard care.
1 month
Palatability and Subject Acceptance (Tolerability)
Time Frame: 1 month
Palatability and subject acceptance of modified diet as assessed by 5 point Likert Scale
1 month
FGF23 (Exploratory Endpoint)
Time Frame: 1 month
Within subject change in geometric mean FGF-23 measurement at baseline as compared to the end of the 1 month intervention. Because of evidence that subjects with diabetes handle phosphorus differently we will analyse result for FGF 23 separately in patients with and without diabetes (Muras et al., 2013, Yoda et al., 2012).
1 month
Serum Potassium (Safety Endpoints):
Time Frame: 1 month
Check serum potassium in week 2. Difference in serum potassium value at 1 month v baseline, in those randomised to the modified diet compared to the difference in serum potassium value at 1 month v baseline in those randomised to standard care.
1 month

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University College Cork

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Cork University Hospital
Irish Nutrition & Dietetic Institute

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Joseph Eustace, MB, HRB Clinical Research Facility

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

  • Byrne F, Gillman B, Renal Interest Group INDI, Eustace J. Multicentre Randomized Control Trial of Phosphate Control with a Modified as Compared to Standard Renal Diet TH-OR030. J Am Soc Nephrol 2018;29:8.

Helpful Links

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 Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
March 6, 2017

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 16, 2017

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
June 16, 2017

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
April 4, 2017

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 5, 2017

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 10, 2017

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
January 18, 2020

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 15, 2020

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
January 1, 2020

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 17-CRFC-01

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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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