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Magnetic Resonance Adenosine Perfusion Imaging as Gatekeeper of Invasive Coronary Intervention (MAGnet)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02580851
Recruitment Status : Completed
First Posted : October 20, 2015
Last Update Posted : May 2, 2018
Information provided by (Responsible Party):
Dr. Dominik Buckert, University of Ulm

Brief Summary:
Current guidelines for the diagnosis and management of patients with stable coronary artery disease (CAD) strongly support the performance of non-invasive imaging techniques for the detection of myocardial ischemia prior to revascularization procedures. This recommendation originates from the strong evidence base showing the lack of prognostic benefit from percutaneous coronary interventions (PCI) over optimal medical therapy in patients without verification of myocardial ischemia. On the other hand, it could be demonstrated that patients with functionally significant coronary artery stenoses do benefit from revascularization. Cardiac magnetic resonance imaging (CMR) has emerged to be a diagnostic modality of choice for the detection of myocardial ischemia with high sensitivity and specificity. The investigators therefore designed this prospective and randomized trial to compare a CMR-driven vs. angiography-driven management of patients with stable CAD concerning major cardiac endpoints, futile angiographies and quality of life.

Condition or disease Intervention/treatment Phase
Stable Coronary Artery Disease Cardiac Magnetic Resonance Imaging Coronary Angiography Myocardial Revascularization Outcomes and Prognosis Quality of Life Other: diagnostic test - cardiac magnetic resonance imaging Other: diagnostic test - coronary angiography Not Applicable

Detailed Description:

Current guidelines for the diagnosis and management of patients with stable coronary artery disease (CAD) recommend - besides thorough history and physical examination - proper risk stratification prior to invasive therapy. The detection or exclusion of moderate to severe reversible myocardial ischemia is a crucial part of the work-up process which designates the patients to the high-risk group when ischemia is present. This is of special interest, as several observational studies have shown that the prognostic benefit from revascularization depends on the amount of myocardial ischemia. Moreover, patients without ischemia do not seem to benefit from revascularization over optimal medical therapy. This emphasizes the need for functional testing prior to therapeutic decisions.

Invasive coronary angiography still is considered to be the "gold-standard" for the diagnosis of CAD, though it exhibits several limitations and shortcomings. Multiple studies have documented the significant interobserver variability in the grading of coronary artery stenosis, as well as the frequent occurrence of under- and overestimation of hemodynamic relevance. One has to conclude that coronary angiography may provide anatomical information but is not the modality of choice concerning the detection of myocardial ischemia. Moreover, there is no study which has randomized patients with stable CAD to either catheterization or no catheterization yet, so there does not exist high-quality evidence which would support the performance of a diagnostic coronary angiography in the majority of cases of stable CAD. This is of special interest, as there is a reported frequency of complications due to diagnostic coronary angiography of about 1.5%. Nevertheless, coronary angiography remains the most often performed diagnostic test in this setting, with more than one-half of elective percutaneous coronary interventions (PCI) done without previous stress-testing.

Adenosine perfusion cardiac magnetic resonance imaging (CMR) is an imaging modality which provides anatomical and functional information in one single examination. With its ability to reliably detect reversible myocardial ischemia, it plays an increasing role in the diagnosis and risk stratification of patients with suspected or known CAD. Though CMR therefore is highly recommended in the diagnostic work-up in the setting of stable CAD, no study exists which would have evaluated a CMR driven approach in patient management with regard to the occurrence of major cardiac events, quality of life and safety endpoints.

Objective of our study is to show that a CMR based conservative or invasive management of patients with suspected or known CAD is not inferior with regard to major cardiac endpoints and quality of life in comparison to a - more conventional - coronary angiography based approach. The investigators assume that a significant number of diagnostic coronary angiographies and PCIs thus could be spared without decrease in patient safety and comfort.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 200 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Magnetic Resonance Adenosine Perfusion Imaging as Gatekeeper of Invasive Coronary Intervention
Study Start Date : December 2011
Actual Primary Completion Date : January 2018
Actual Study Completion Date : February 2018

Resource links provided by the National Library of Medicine

Drug Information available for: Adenosine

Arm Intervention/treatment
Coronary angiography
Patients directly undergo diagnostic coronary angiography. A PCI is performed according to current guidelines in case of ≥70% stenosis in a coronary vessel with ≥2 mm diameter.
Other: diagnostic test - coronary angiography
Cardiac magnetic resonance imaging
Patients receive adenosine perfusion CMR for functional testing, first. The examination is conducted on a 3.0 Tesla whole-body scanner with a 32-channel phased-array cardiac receiver coil according to a well-established standard protocol [21-23]. In case reversible ischemia can be detected, subjects are sent to coronary angiography and PCI afterwards.
Other: diagnostic test - cardiac magnetic resonance imaging

Primary Outcome Measures :
  1. Number of cardiac deaths and non-fatal myocardial infarctions occurring in study cohort assessed by medical records [ Time Frame: 3 years ]

Secondary Outcome Measures :
  1. Number of invasive procedures [ Time Frame: 3 years ]
    Diagnostic coronary angiographies/PCIs

  2. Quality of life [ Time Frame: 3 years ]
    Assessed by Seattle Angina Questionnaire

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients who present themselves for the evaluation of symptoms being likely to be caused by CAD, such as exercise-related chest pain or dyspnea.

Exclusion Criteria:

  • Unability to give written informed consent
  • Unstable angina
  • Cardiac or respiratory instability
  • Contraindication for CMR
  • Allergy to Gadolinium
  • Impaired renal function
  • Allergy to adenosine
  • Pregnancy

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02580851

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University of Ulm
Ulm, Germany, 89081
Sponsors and Collaborators
University of Ulm
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Principal Investigator: Peter Bernhardt, Prof. Dr. University of Ulm
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Dr. Dominik Buckert, MD, University of Ulm Identifier: NCT02580851    
Other Study ID Numbers: 237/11
First Posted: October 20, 2015    Key Record Dates
Last Update Posted: May 2, 2018
Last Verified: May 2018
Additional relevant MeSH terms:
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Coronary Artery Disease
Coronary Disease
Myocardial Ischemia
Heart Diseases
Cardiovascular Diseases
Arterial Occlusive Diseases
Vascular Diseases