Myocardial Perfusion Magnetic Resonance Imaging Using Regadenoson
This is a pilot study to determine whether the drug regadenoson can be used during magnetic resonance imaging to assess regions of poor blood flow to the heart.
The hypothesis of this study is that a single injection of regadenoson could be used instead of a standard adenosine infusion to produce coronary vasodilatation and demonstrate myocardial ischemia during first-pass perfusion cardiac MRI.
|Study Design:||Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Single Blind (Outcomes Assessor)
Primary Purpose: Diagnostic
|Official Title:||Feasibility of Detecting Myocardial Ischemia by First-pass Contrast MRI Using Regadenoson|
- Feasibility of use of regadenoson during cardiac perfusion MRI to visualize regions of myocardial ischemia as demonstrated on SPECT-MPI. [ Time Frame: 1 year ] [ Designated as safety issue: No ]
|Study Start Date:||June 2009|
|Study Completion Date:||December 2011|
|Primary Completion Date:||December 2011 (Final data collection date for primary outcome measure)|
Experimental: Regadenoson CMR
Images in the cardiac short axis will be obtained using a gradient recalled echo sequence, TR 2.3 msec/TE 1.1 msec, 80*256 matrix, slice thickness 10 mm. Images will be obtained during power injection of 0.075 mmol/Kg of a conventional gadolinium based MR contrast agent at a rate of 5 mL/sec followed by a 15 mL saline flush into an antecubital vein. Perfusion imaging will be performed at stress and rest. Stress: Regadenoson 400 mcg will be administered IV bolus via an antecubital cannula. Immediately after injection, MR scanning will begin and contrast will be given. Rest: After 10 minutes, rest imaging will be performed identically, but without regadenoson injection. To identify late enhancement of myocardial tissue inversion recovery prepared images will be obtained.
Regadenoson 400 micrograms will be administered IV bolus via an antecubital cannula.
Other Name: Lexiscan
This is a pilot study that proposes to assess the feasibility of using regadenoson (Lexiscan, Astellas), a recently FDA approved A2A receptor agonist, as the stress perfusion agent in cardiac MRI perfusion examinations. While regadenoson has been approved by the FDA, it has not been approved for the specific indications of use 1) during the simultaneous intravenous administration of a gadolinium-based contrast agent, or 2) during magnetic resonance imaging (MRI).
Because this agent can be given intravenously in a single 400 microgram bolus, rather than in an infusion, this agent may be easier to administer than adenosine during an MRI examination.
The objectives for this pilot study are: 1) To demonstrate the feasibility of using regadenoson during cardiac perfusion MRI to visualize known regions of myocardial ischemia as demonstrated on SPECT-MPI and 2) To describe a cardiac perfusion MRI protocol using regadenoson that would have the potential to be used clinically.
|United States, Missouri|
|Washington University School of Medicine|
|St. Louis, Missouri, United States, 63110|
|Principal Investigator:||Pamela K. Woodard, M.D.||Washington University School of Medicine|