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Lookup NU author(s): Dr David AustinORCiD
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© Author(s) (or their employer(s)) 2025.Background: Cardiac magnetic resonance (CMR) may radiologically identify or confirm underlying pathophysiologies in myocardial infarction with non-obstructive coronary arteries (MINOCA), however, there are scant prospective data evaluating the impact on routine clinical care. Methods: In a multicentre international cohort study of MINOCA, clinical diagnosis, diagnostic certainty and intended clinical management were prospectively determined before and again after CMR. The primary outcome was a composite of change in clinical diagnosis and/or management. Secondary outcomes were individual components of the primary outcome, change in diagnostic certainty and number-needed-to-test for deprescription of dual antiplatelet therapy (DAPT). Predictors of the primary outcome were evaluated by multivariable logistic regression analysis. Results: In 320 patients, CMR was associated with change in diagnosis and/or management in 63% (95% CI 57% to 68%, p<0.001) and significantly increased diagnostic certainty (8/10 post-CMR (5-9) vs 6/10 pre-CMR (4-7), p<0.0001). Relevant predictors of the primary outcome on multivariable analysis were early CMR (≤14 days), absence of atheroma on coronary angiography and significant pre-CMR diagnostic uncertainty (≤5/10); CMR changed diagnosis and/or management in 80% of individuals with all three predictors versus 40% in those with none. In individuals where treating physicians initially chose to prescribe DAPT despite no obstructive culprit lesion, number-needed-to-test by CMR for DAPT deprescription was 3. Conclusions: CMR in MINOCA is associated with significant changes in clinical diagnosis, diagnostic certainty and management. The impact on deprescription of unnecessary DAPT could have important implications for patient safety and costs and warrants further evaluation. Early CMR should be considered to augment diagnosis and management in MINOCA.
Author(s): Rajwani A, Giudicatti L, Telyuk P, Maredia N, Ihdayhid A, Chieng D, Pasupathy S, Beltrame J, McQuillan B, Spiro J, Schultz C, Hillis GS, Austin D, Dwivedi G
Publication type: Article
Publication status: Published
Journal: Heart
Year: 2025
Pages: epub ahead of print
Online publication date: 13/06/2025
Acceptance date: 18/05/2025
ISSN (print): 1355-6037
ISSN (electronic): 1468-201X
Publisher: BMJ Publishing Group
URL: https://doi.org/10.1136/heartjnl-2024-325181
DOI: 10.1136/heartjnl-2024-325181
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