Variation in Serum Levels of Metformin in Patients With Reduced Renal Function

September 6, 2018 updated by: Gunnar Sterner, Skane University Hospital

Intraindividual Variation of Serum Metformin in a Cohort of Patients With Type 2 DM and Moderately Reduced Renal Function

Metformin is widely used for treatment of type 2 diabetes mellitus. Side-effects are few and mainly from the gastrointestinal tract. Since metformin is cleared from the blood exclusively via the kidneys reduced renal function is a relative contraindication. We have earlier demonstrated that metformin safely can be used to a lower GFR level of 30 ml/min/1.73. Below that level the risk of lactacidosis, a severe complication, increases.

In the present study we plan to analyse serum levels of metformin repeatedly in patients with moderate renal failure (CKD = GFR of 30-60 ml/min/1.73). Blood samples will be taken as trough values in the morning, week 0, 2, 4, and 8 and at four weeks a blood sample will be taken two hours after intake of the morning dose of metformin. Renal function will be estimated with creatinine and cystatin C at each occasion. The intraindividual variation of metformin will be calculated.

The study rests on a new method for measuring metformin. The technique uses Liquid Chromatography Tandem Mass Spectometry (LCMSMS). Proteins are removed from serum by adding acetonitrile to the sample. After centrifugation a diluted portion of the supernatant is injected into the LCMSMS-system. The total runtime for a sample is 6 minutes.

The study will show if variation in serum levels of metformin measured in the same patient is high or low and thus give us better understanding whether a change i serum level is due to biological variation or to increased retention caused by progressive renal failure.

Study Overview

Study Type

Observational

Enrollment (Actual)

30

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

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

Patients with type 2 DM followed at the out-patient department at the hospital will be asked to join the study

Description

Inclusion Criteria:

  • Patients above the age of 18 years with type 2 diabetes mellitus.
  • Reduced renal function measured as estimated GFR (below 60 ml/min/1.73).
  • Treatment with metformin on going.

Exclusion Criteria:

  • Severely reduced GFR (< 30 ml(min/1.73)

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

Collaborators and Investigators

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

Publications and helpful links

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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

October 1, 2008

Primary Completion (Actual)

June 1, 2009

Study Completion (Actual)

July 1, 2009

Study Registration Dates

First Submitted

October 6, 2008

First Submitted That Met QC Criteria

October 6, 2008

First Posted (Estimate)

October 7, 2008

Study Record Updates

Last Update Posted (Actual)

September 10, 2018

Last Update Submitted That Met QC Criteria

September 6, 2018

Last Verified

September 1, 2018

More Information

Terms related to this 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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