Magnetic Resonance Imaging of Narrowed Arteries

Completed · Phase 1

Conditions studied: Arteriosclerosis

In brief

This study will compare four methods of imaging arteries: * angiography (x-ray picture) * intravascular ultrasound (ultrasound from inside the artery) * magnetic resonance imaging (MRI) from outside the body * MRI using an antenna to take pictures inside the arteries of the pelvis Standard angiography shows blockages inside the artery, but does not provide any information about the arterial wall itself. New ways of looking at the artery walls with MRI and ultrasound may provide insight into how arteries cause disease. Patients 21 years of age and older who require catheterization and angiography of the heart, kidney, or leg arteries because of atherosclerosis (narrowing of the arteries), may be eligible for this study. Participants will undergo MRI and intravascular ultrasound of the arteries immediately after their catheterization and angiography. The additional imaging will add from 1 to 2 hours to the angiogram procedure. * Angiography: Using the sheaths already in place in the groin artery, catheters (flexible plastic tubes) are placed inside the arteries in order to inject a contrast dye to take x-ray pictures. (Patients who had an angiogram of the leg artery as part of their medical care will not repeat this test.) * Intravascular ultrasound: An anti-clotting drug called heparin is given through a vein to prevent clot formation. Blood samples are taken during the test to see if more heparin is needed. Special wires are used to guide the catheters to the proper location inside the arteries. A special ultrasound catheter is advanced over one of these wires to the large artery that supplies blood to the legs. X-rays are used to help the physician place the ultrasound in the correct location to take ultrasound pictures of the artery wall. * Magnetic resonance imaging: A special MRI catheter is advanced through the catheter in the groin. With the catheter in place, the patient is carried to a stretcher and moved into a long metal cylinder (the MRI scanner) for imaging. During the scanning, a contrast drug called gadolinium is injected into an arm vein to brighten the images. The patient is able to speak through a microphone at all times to the person taking the pictures.

Key facts

Study ID

NCT00029575

Run by

National Heart, Lung, and Blood Institute (NHLBI)

People needed

25

Starts

2002-01-01

Expected to finish

2003-12-01

Last updated by the study team

2008-03-04

Who can join

Age: any. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Adult patients undergoing a clinically driven transfemoral diagnostic or therapeutic cardiac or peripheral catheterization procedure
• EXCLUSION CRITERIA - General:
• Contraindication to Heparin
• Patients less than 21 years old
• Pregnant or lactating women
• EXCLUSION CRITERIA - Contraindications to MRI:
• Prior allergic reaction to Gadolinium contrast
• 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)
• EXCLUSION CRITERIA - Contraindications to Iodinated Contrast in a Research Study:
• Serum creatinine greater than 2.0 mg/dl
• Decompensated congestive heart failure

Where it is running

• National Heart, Lung and Blood Institute (NHLBI) — Bethesda, Maryland, United States

Full record on ClinicalTrials.gov

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