July 2013: Dr. Field's team requested and was granted an extension to continue progress in this study, since his study was delayed by one year awaiting approval by the Institutional Review Board. As of July his team had enrolled and scanned 121 people.
September 2012: Researchers continue with their progress in the seven Society-funded CCSVI studies in MS. Read about the most recent progress.
January 2012: Official approval of this study protocol was issued on June 28, 2011. The team continues to actively recruit study subjects from a database of approximately 100 MS patients who had contacted them since the study was first announced, as well as from the patient population seen regularly in their MS clinic. Thus far, 17 people with MS and 12 healthy controls have undergone both MRI/MRV and ultrasound imaging. No results are yet available as the study is blinded.
Since the previous progress report, Dr. Field was awarded a $27,000 grant from his institution to further investigate the novel MRI components of this study in healthy controls, particularly with regard to reliability and reproducibility. Specifically, they investigated (1) the use of a novel method to adjust venous flow measurements for variations related to breathing and heartbeat, (2) the use of a novel MRI method for measuring the iron content in brain tissue, and (3) the use of a relatively new, FDA-approved MRI contrast agent (a drug administered intravenously to enhance the visibility of blood vessels on MRI) that can enhance the visibility of head/neck veins and enable the measurement of blood flow through brain tissue. Ten healthy subjects underwent these components of the team’s CCSVI protocol twice, on separate days. Progress made in these studies includes:
The team’s novel approach to measuring venous flow with MRI is able to detect clear differences in venous flow between inspiration and expiration, and demonstrates evidence of expiration-related reflux (backwards flow) in the jugular veins of healthy subjects.
The team’s system of rating the degree of venous narrowing on MR images of the azygous and jugular veins yields comparable results when performed by different individuals.
Their novel MRI method for measuring iron content in brain tissue provides reproducible results that are comparable to previously described methods of iron measurement, with fewer technical pitfalls.
A single dose of a relatively new MRI contrast agent is sufficient to enhance the visibility of head/neck veins and generate reproducible maps of blood flow through the brain. (It would normally require two separate doses of a conventional contrast agent to accomplish both of these objectives.)
These investigations have yielded two abstracts presented or to be presented at national/international imaging meetings:
“Comprehensive assessment of cerebral venous return with MRA: preliminary results.” Wieben O, Johnson K, Schrauben E, Reeder S, Field A. 23rd annual meeting of the “MRA Club” (International Magnetic Resonance Angiography Workshop), Calgary, Alberta, Canada, September 25-28, 2011.
“The importance of the sonographer in the investigation of chronic cerebrospinal venous insufficiency.” Kohn S, Kliewer K, Field AS. American Institute of Ultrasound in Medicine (AIUM) Annual Convention, Phoenix, AZ, March 29-April 1, 2012.
In addition, three abstracts have been submitted for consideration for the American Society of Neuroradiology (ASNR) 50th Annual Meeting, New York, NY, April 21-26, 2012, and two have been submitted for the International Society of Magnetic Resonance in Medicine (ISMRM) 20th Annual Meeting & Exhibition, Melbourne, Victoria, Australia, May 5-11, 2012.