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Stress Cardiac MRI for Evaluation of Nonspecific Allograft Dysfunction
Not Recruiting
Trial ID: NCT02597543
Purpose
The investigators will use cardiac MRI to measure the myocardial perfusion reserve and amount
of myocardial edema and fibrosis in heart-transplant patients with nonspecific allograft
dysfunction in contrast to those with normal graft function. The investigators hypothesize
that patients with nonspecific allograft dysfunction will demonstrate decreased myocardial
perfusion reserve, related to microvascular allograft vasculopathy, compared to those with
normal graft function.
Official Title
Stress Cardiac MRI Using Regadenoson for Evaluation of Nonspecific Allograft Dysfunction
Stanford Investigator(s)
Patricia Nguyen
Associate Professor of Medicine (Cardiovascular Medicine)
Eligibility
Inclusion Criteria:
- Age greater than or equal to 18 years old.
- At least three months status post heart transplantation.
- Heart-transplant patients with normal graft function (left ventricular ejection
fraction equal to or greater than 55%) and no prior history of clinically significant
acute rejection episodes that required modification of the immunosuppressive regimen
or cardiac allograft vasculopathy.
- Heart-transplant patients with nonspecific allograft dysfunction (left ventricular
ejection fraction equal to or less than 50% AND decrease from post-transplant baseline
ejection fraction by an absolute difference of 10% or greater, no formal diagnosis of
allograft vasculopathy by coronary angiogram or coronary vascular ultrasonography, and
no history of prior acute rejection episodes known to have decreased left ventricular
ejection fraction to or less than 50%).
Exclusion Criteria:
- Biopsy proven acute rejection episode in the past 3 months.
- Patients with symptoms or signs of acute myocardial ischemia or recent acute coronary
syndrome in the past 3 months.
- Uncontrolled obstructive ventilatory disease including asthma and COPD.
- Second or third degree AV nodal block.
- Sinus node dysfunction.
- Contraindications to MRI including pacemakers or implantable
cardioverter-defibrillators.
- Renal dysfunction with an estimated GFR less than 30 mL/min/1.73m2.
- Prior adverse reaction to either regadenoson or gadolinium contrast. Prior adverse
reaction to adenosine will be assessed on a case-by-case basis.
- Any invasive procedure, including endomyocardial biopsy and left coronary angiogram,
performed within one week.
- Systolic blood pressure greater than 180 or less than 85 mmHg.
- Diastolic blood pressure greater than 120 or less than 40 mmHg.
- Resting heart rate greater than 120 or less than 45 beats per minute.
- Severe claustrophobia.
Intervention(s):
drug: Regadenoson
drug: Gadolinium
procedure: Cardiac MRI
Not Recruiting
Contact Information
Stanford University
School of Medicine
300 Pasteur Drive
Stanford,
CA
94305