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MRI to Detect Embolism Following Angiography and Angioplasty-Stenting of the Renal Artery

This study has been completed.
Information provided by:
National Institutes of Health Clinical Center (CC) Identifier:
First received: December 7, 2001
Last updated: March 3, 2008
Last verified: December 2005

This study will use magnetic resonance imaging (MRI) to picture the kidney and renal arteries (arteries that supply blood to the kidney) in patients scheduled for kidney artery angiogram and angioplasty/stenting procedures. An angiogram is a way of taking pictures of arteries that shows areas of narrowing caused by atherosclerosis-a buildup of plaque on the vessel wall. Angioplasty/stent is a treatment procedure in which a balloon-tipped catheter is inserted in the artery and advanced to the area of blockage to open the vessel, increasing blood flow to the kidney. A permanent metal tube (stent) may or may not be put in place to maintain the opening. During either of these invasive procedures, small pieces of plaque can break off and travel in the blood to lodge elsewhere in the body. This is called embolization. Lodged in the kidney, the embolus can impair kidney function. Currently, these emboli cannot be detected. A new way of visualizing the kidneys that allows detection of emboli may reveal whether material has moved to the kidneys and predict if there will be any kidney damage.

Patients 21 years of age and older with suspected kidney artery disease scheduled for invasive angiographic evaluation in NIH protocol 95-H-0047 may be eligible for this study.

Participants will be assigned to one of two study groups, based on the angiogram findings and the decision to have the angioplasty/stent procedure. Participants in both groups will have baseline MRI scans up to 2 weeks before the invasive procedure (angiogram with or without angioplasty/stent) and again within a day after the procedure. Patients who undergo angioplasty/stent will have another MRI study within about a month following the procedure.

MRI uses a magnetic field and radio waves to produce images of body tissues. The patient lies on a table that slides into a large hollow tube (the scanner). During part of the scan, a material called gadolinium contrast may be injected into a vein. This substance brightens the images to better show the kidneys, their blood vessels and blood flow. The procedure lasts from about 1 to 2 hours. During the MRI, the heart is monitored with an electrocardiogram (EKG) and breathing is monitored with a flexible belt. Blood pressure is measured intermittently. The patient can communicate with a staff member at all times.

Blood samples will be drawn from an arm vein at the initial clinic visit, within a day after the procedure and about 1 week after the procedure. For patients who had the angioplasty/stent procedure, a third blood sample will be taken within another 6 six weeks. The blood samples will be used to check for changes in kidney function.

Condition Intervention Phase
Renal Artery Obstruction Kidney Disease Procedure: MRI Phase 1

Study Type: Interventional
Study Design: Primary Purpose: Treatment
Official Title: Evidence of Procedural Embolism Complicating Renal Artery Stenting

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Estimated Enrollment: 60
Study Start Date: December 2001
Estimated Study Completion Date: December 2005
Detailed Description:

Atherosclerotic renal artery stenosis (ARAS) is common and is associated with uncontrolled hypertension and renal excretory dysfunction. Percutaneous stenting of ARAS effectively relieves arterial obstruction, but approximately one-quarter of patients derives no apparent clinical benefit or actually suffers deterioration in renal excretory function. There are reasons to suspect that percutaneous renal intervention is associated with embolization of aorto-ostial atheromatous debris, which may lead to adverse clinical outcomes. There are no known clinical, imaging, or biochemical markers of renal embolism or ischemic necrosis. Investigational or clinical detection of such events might guide future modification of mechanical interventional technique, for example, with the introduction of procedural embolic protection devices.

This pilot study of patients undergoing percutaneous transluminal renal artery stenting (PTRAS) will attempt to image embolization using magnetic resonance imaging (MRI).


Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


Adult patients with clinically suspected renovascular disease undergoing invasive angiographic assessment in protocol 95-H-0047 at the NIH CC.

Adult patients with clinically suspected renovascular disease undergoing invasive angiographic assessment at other medical centers.

EXCLUSION CRITERIA - Contraindications to MRI:

Cardiac pacemaker or implantable defibrillator

Cerebral aneurysm clip

Neural stimulator (e.g. TENS-Unit)

Any type of ear implant

Metal in eye (e.g. from machining)

Any implanted device (e.g. insulin pump, drug infusion device)

Known hypersensitivity to gadolinium contrast agents


Patients less than 21 years old

Pregnant or lactating women

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00027469

United States, Maryland
National Heart, Lung and Blood Institute (NHLBI)
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
  More Information

Publications: Identifier: NCT00027469     History of Changes
Other Study ID Numbers: 020059
Study First Received: December 7, 2001
Last Updated: March 3, 2008

Keywords provided by National Institutes of Health Clinical Center (CC):
Renal Artery Stenosis
Renovascular Hypertension
Renovascular Disease
Renal Artery Stenting

Additional relevant MeSH terms:
Kidney Diseases
Renal Artery Obstruction
Urologic Diseases
Embolism and Thrombosis
Vascular Diseases
Cardiovascular Diseases
Arterial Occlusive Diseases processed this record on August 16, 2017