MRI-Guided Balloon Angioplasty to Treat Blood Flow Blockage in the Legs

June 30, 2017 updated by: National Heart, Lung, and Blood Institute (NHLBI)

Real-Time MRI-Guided Percutaneous Intervention for Aorto-illac and Femoropopliteal, Artery Stenosis

This study will examine the use of magnetic resonance imaging (MRI) instead of x-rays to guide angioplasty in patients who require these treatments to treat blockages in leg arteries. Angioplasty is a procedure in which a balloon is inflated in a blocked artery to improve blood flow. MRI uses a magnetic field and radio waves rather than x-rays to show pictures of body tissues and organs. MRI shows all soft tissue, including the arteries, blood, and other organs, while the usual x-ray technique shows only the lumen of the artery when it is filled with dye, but not the vessel walls.

Patients 18 years of age and older who require angioplasty with or without stenting to restore blood flow to the leg may be eligible for this study.

Participants undergo the usual angioplasty procedure. The skin in the patient's groin area is numbed and a catheter is placed into the groin artery. The patient is given a blood-thinning medicine, and then other catheters are inserted to measure blood pressure and to inject a contrast dye to take pictures. Balloon catheters are inflated to open the blockage and, if needed, stents are put in place to maintain the opening. When the blood thinner wears off, the catheters are removed.

Most of the procedure is conducted using MRI instead of X-rays to visualize the arteries and blockages. The patient is moved back and forth between the x-ray and MRI machines in a specially designed laboratory. If necessary, stenting, placement of a wire mesh to hold open the artery, is done using conventional x-ray techniques.

The entire procedure, including MRI, takes up to 4 hours.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Cardiovascular interventional procedures are minimally-invasive, catheter-based treatments such as coronary artery angioplasty and stenting. These procedures generally can be conducted on awake patients with few complications, and were developed as alternatives to conventional open surgery. Conventional cardiovascular interventional procedures are conducted by physician manipulating medical devices inside patients under the guidance of fluoroscopic x-ray.

We have developed minimally-invasive cardiovascular interventional procedures using real-time magnetic resonance imaging. These procedures have the advantage of excellent imaging without surgery and without ionizing radiation exposure or toxic contrast agents (dyes). Moreover, because real time MRI can produce excellent images of soft tissue, blood, and of three-dimensional structures, it may be possible to guide minimally-invasive procedures not possible even with invasive surgery.

A state-of-the-art combined X-ray and MRI interventional suite has been constructed and equipped with real-time MRI image reconstruction for interventional experiments, patient monitoring and transport equipment for dual imaging modalities, and large-mammal preclinical simulation experiments. Preclinical experiments in a porcine model of surgical aortic coarctation have shown that real-time MRI guided percutaneous intervention can be conducted using entirely commercially-available devices approved by the US Food and Drug Administration.

The goal of this protocol is to test clinical peripheral artery revascularization procedures guided wholly-or in part by real-time MRI.

Study Type

Interventional

Enrollment

24

Phase

  • Phase 1

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

  • United States
    • Maryland
      • Bethesda, Maryland, United States, 20892
        • National Institutes of Health Clinical Center, 9000 Rockville Pike

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

Description

  • INCLUSION CRITERIA:

Patients with known or suspected cardiovascular disease will be eligible for participation in this protocol. The patient is eligible under the following conditions:

  • Patients age is greater than 18 years of age.
  • Undergoing a clinically-indicated therapeutic peripheral artery catheterization procedure.
  • Target peripheral artery is aorto-illac or femoropopliteal artery.
  • Target peripheral artery stenoses, not occlusions, evident on magnetic resonance or x-ray angiography.

EXCLUSION CRITERIA:

Patients with absolute contraindications to MRI scanning will be excluded. These contraindications include patients with the following devices:

  • Implanted cardiac pacemaker or defibrillator.
  • Central nervous system aneurysm clips.
  • Implanted neural stimulator.
  • Cochlear implant.
  • Ocular foreign body (e.g. metal shavings).
  • Insulin pump.
  • Metal shrapnel or bullet.

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

Collaborators and Investigators

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

Sponsor

National Heart, Lung, and Blood Institute (NHLBI)

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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 20, 2004

Study Completion

June 17, 2008

Study Registration Dates

First Submitted

October 22, 2004

First Submitted That Met QC Criteria

October 22, 2004

First Posted (Estimate)

October 25, 2004

Study Record Updates

Last Update Posted (Actual)

July 2, 2017

Last Update Submitted That Met QC Criteria

June 30, 2017

Last Verified

June 17, 2008

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 050007
  • 05-H-0007

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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