Effect of Modifying Magnesium Concentration in Citrate-enriched Dialysate on Serum Magnesium Levels (OMAGOD-1)

April 27, 2026 updated by: Universitaire Ziekenhuizen KU Leuven

Effect of Modifying Magnesium Concentration in Citrate-enriched Dialysate on Serum Magnesium Levels: a Randomized Single-blind Crossover Study: Pilot-OMAGOD

Individuals with ESKD and treated with hemodialysis have a high mortality risk. Associative studies suggest a relationship between serum magnesium concentration and mortality risk. The influence of magnesium concentration on mortality risk is unknown. This pilot study will explore whether altering dialysate magnesium concentration in the presence of citrate will change serum magnesium concentrations.

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

To determine if a citrate enriched, Mg 1.0 mmol/L dialysate, when compared to a Mg 0,75 mmol/L citrate enriched dialysate leads to a:

  • higher average serum predialysis total Mg on day 15 of the intervention
  • higher average serum predialysis ionized Mg on day 15 of the intervention
  • higher average serum postdialysis ionized Mg on day 15 of the intervention
  • smaller proportion of patients with serum predialysis Mg <1,05 mmol/L on day 15 of the intervention
  • larger proportion of patients with serum predialysis Mg > 1,50 mmol/L on day 15 of the intervention
  • larger difference in predialysis Mg on day 15 versus day one of the intervention.

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.
54

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

  • Belgium
    • Brussels Capital
      • Brussels, Brussels Capital, Belgium, 1000
        • UZ Brussel
    • Oost-Vlaanderen
      • Aalst, Oost-Vlaanderen, Belgium
        • AZORG
    • Vlaams-Brabant
      • Leuven, Vlaams-Brabant, Belgium, 3000
        • UZ Leuven
    • West-Vlaanderen
      • Kortrijk, West-Vlaanderen, Belgium, 3621
        • Az Groeninge

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

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Written informed consent must be obtained prior to any screening procedures
  2. Clinically stable during two months prior to the study. This will be based upon clinical judgement.
  3. On stable blood pressure medication 4 weeks prior to the study
  4. Dialysis with a K3 dialysate
  5. Adequate double-needle dialysis access (fistula or catheter)
  6. Able to fill questionnaire/symptom score

Exclusion Criteria:

  1. Predialysis calcium <1,9mmol/L during baseline
  2. Magnesium predialysis >1,45mmol/L during baseline
  3. Patient has a history of child C liver cirrhosis
  4. Coronary intervention <3 months before randomization
  5. Hospitalization <2 months before randomization
  6. Uncontrolled predialysis hypertension >160/90mmHg despite 4 antihypertensive drugs
  7. Predialysis blood pressure <90mmHg during baseline visit
  8. History of dialysis access related problems <1 month before the randomization
  9. Chronic Atrial fibrillation
  10. NYHA class 4 heart failure
  11. Any disorder, which in the investigator's opinion might jeopardise participant's safety or compliance with the CIP.

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: Crossover 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: Arm A - B
Patients undergo treatment with intervention A (dialysate magnesium 0.75 mmol), followed by intervention B (dialysate magnesium 1.00 mmol/l)
Device: A - Dialysate magnesium 0.75
Citrate-based concentrate with magnesium 0.75 mmol/l
Other Names:
  • Intervention A
Device: B - Dialysate magnesium 1.00 mmol/L
Citrate-based concentrate with magnesium 1.00 mmol/l
Other Names:
  • Intervention B
Active Comparator: Arm B - A
Patients undergo treatment with intervention B (dialysate magnesium 1.00 mmol), followed by intervention A (dialysate magnesium 0.75 mmol/l)
Device: A - Dialysate magnesium 0.75
Citrate-based concentrate with magnesium 0.75 mmol/l
Other Names:
  • Intervention A
Device: B - Dialysate magnesium 1.00 mmol/L
Citrate-based concentrate with magnesium 1.00 mmol/l
Other Names:
  • Intervention B

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
Proportion predialysis magnesium in target range
Time Frame: 2 weeks
Proportion of patients with a predialysis serum Mg concentration between 1,10 and 1,45mmol/L on day 15 of the intervention
2 weeks

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
Mean predialysis Magnesium
Time Frame: 2 weeks
Average serum predialysis total Mg on day 15 after intervention/comparator
2 weeks
Mean predialysis ionized Magnesium
Time Frame: 2 weeks
Average serum predialysis ionized Mg on day 15 after the intervention/comparator
2 weeks
Mean postdialysis ionized Magnesium
Time Frame: 2 weeks
Average serum postdialysis ionized Mg on day 15 after intervention/comparator
2 weeks
Proportion low predialysis magnesium
Time Frame: 2 weeks
Proportion of patients with predialysis Mg <1,05 mmol/L on day 15 of the intervention
2 weeks
Proportion high predialysis magnesium
Time Frame: 2 weeks
Proportion of patients with predialysis Mg >1,5 mmol/L on day 15 of the intervention
2 weeks
Cardiac safety endpoint 1
Time Frame: 2 weeks
occurrance of cardiac arrythmias
2 weeks
Cardiac safety endpoint 2
Time Frame: 2 weeks
Change in QTc-interval in milliseconds
2 weeks

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Exploratory 1 - muscle cramps
Time Frame: 2 weeks
muscle cramps
2 weeks

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.
Universitaire Ziekenhuizen KU Leuven

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.
Fresenius AG

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.
  • Study Chair: Bjorn Meijers, MD, PhD, UZ Leuven
  • Principal Investigator: Karlien Francois, MD, PhD, Universitair Ziekenhuis Brussel
  • Principal Investigator: Gert Meeus, MD, AZ groeninghe
  • Principal Investigator: Rogier Caluwé, MD, PhD, AZORG

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.
January 28, 2025

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.
January 15, 2026

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.
January 31, 2026

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 27, 2026

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.
April 27, 2026

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 4, 2026

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.
May 4, 2026

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.
April 27, 2026

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.
April 1, 2026

More Information

Terms related to this study

Keywords

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.
  • S67800

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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Conditions

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Dietary Supplements

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