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Resistive Index Measurements After Kidney Transplantation

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: June 17, 2013
Last Update Posted: June 17, 2013
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
Prof Dr Maarten Naesens, Universitaire Ziekenhuizen Leuven
The purpose of this study is to evaluate the prognostic performance of intrarenal resistive index in the first years after kidney transplantation on graft function and on patient and graft survival. In addition, the determinants of the intrarenal resistive index, including a detailed analysis of the relation between graft histology and the intrarenal resistive index, will be assessed.

Kidney Failure

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Correlation Between Renal Vascular Resistive Index, Renal Allograft Histology and Outcome

Resource links provided by NLM:

Further study details as provided by Prof Dr Maarten Naesens, Universitaire Ziekenhuizen Leuven:

Primary Outcome Measures:
  • Overall renal allograft survival [ Time Frame: 7 years after transplantation ]
  • Death-censored graft survival [ Time Frame: 7 years after transplantation ]
  • Patient survival [ Time Frame: 7 years after transplantation ]
  • Reduction of 50% or more in the eGFR from the value measured at the time of ultrasonography [ Time Frame: 7 years after transplantation ]

Enrollment: 346
Study Start Date: March 2004
Study Completion Date: June 2012
Primary Completion Date: June 2012 (Final data collection date for primary outcome measure)
Kidney transplant recipients
All de novo renal allograft recipients transplanted at the University Hospitals Leuven between March 2004 and October 2007

Detailed Description:

Since March 2004, and as part of routine clinical practice, protocol renal allograft biopsies are routinely performed at implantation and at 3, 12 and 24 months after transplantation, in all patients who receive a kidney transplant at the University Hospitals Leuven, unless there is a medical contra-indication or patient refusal to undergo this procedure. The biopsies are scheduled using a dedicated Microsoft Access database ("Biopsy Database"), that is maintained on the central servers of the University Hospitals Leuven. Patients who have an unexplained change in renal allograft function, undergo additional clinically indicated indication biopsies. These biopsies are also recorded in the aforementioned Microsoft Access Database.

All clinical data, including pretransplant donor and recipient characteristics, and post-transplant follow-up data are directly stored and maintained in a prospectively collected electronic database (CCL database until 06/2012, transferred to the central KWS database in 2012). This electronic database is the only existing clinical database for these patients, and contains all clinical patient charts. No written records are collected.

All renal allograft biopsies will be rescored by a single renal pathologist according to the most recent Banff classification, blinded for the clinical parameters and timing of the biopsy. These rescoring data are directly entered in the dedicated Microsoft Access database ("Biopsy Database").

Just prior to performing a renal allograft biopsy with ultrasound guidance, and as part of the routine clinical procedure, duplex measurements are performed by the radiologist who will perform the biopsy. The peak systolic velocity (Vmax) and the minimal diastolic velocity (Vmin) are determined in each patient in two to three representative interlobar arteries. The resistive index is calculated as [1 - (V min/V max)]. This procedure is repeated at three different places in the kidney (lower, interpolar and upper pole). These data are directly entered in the central electronic clinical database system (KWS, see above).

All electronic data will be transferred to a SAS database at time of data extraction.


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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
All de novo renal allograft recipients transplanted at the University Hospitals Leuven between March 2004 and October 2007

Inclusion Criteria:

Single kidney transplantation

Exclusion Criteria:

  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01879124

Universitaire Ziekenhuizen Leuven
Leuven, Belgium, 3000
Sponsors and Collaborators
Universitaire Ziekenhuizen Leuven
Principal Investigator: Maarten Naesens, MD PhD University Hospitals Leuven
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Prof Dr Maarten Naesens, Prof. Dr. Maarten Naesens, Universitaire Ziekenhuizen Leuven
ClinicalTrials.gov Identifier: NCT01879124     History of Changes
Other Study ID Numbers: KidneyTX-UZLEUVEN-RI
First Submitted: June 10, 2013
First Posted: June 17, 2013
Last Update Posted: June 17, 2013
Last Verified: June 2013

Additional relevant MeSH terms:
Renal Insufficiency
Kidney Diseases
Urologic Diseases