Mitral regurgitation quantified by CMR 4D-flow is associated with microvascular obstruction post reperfused ST-segment elevation myocardial infarction

Hosamadin Assadi (Lead Author), Ciaran Grafton-Clarke, Ahmet Demirkiran, Rob J. van der Geest, Robin Nijveldt, Marcus Flather, Andrew J. Swift, Vassilios Vassiliou, Peter P. Swoboda, Amardeep Dastidar, John P. Greenwood, Sven Plein, Pankaj Garg

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Abstract

Objectives: Mitral regurgitation (MR) and microvascular obstruction (MVO) are common complications of myocardial infarction (MI). This study aimed to investigate the association between MR in ST-elevation MI (STEMI) subjects with MVO post-reperfusion. STEMI subjects undergoing primary percutaneous intervention were enrolled. Cardiovascular magnetic resonance (CMR) imaging was performed within 48-hours of initial presentation. 4D flow images of CMR were analysed using a retrospective valve tracking technique to quantify MR volume, and late gadolinium enhancement images of CMR to assess MVO. 

Results: Among 69 patients in the study cohort, 41 had MVO (59%). Patients with MVO had lower left ventricular (LV) ejection fraction (EF) (42 ± 10% vs. 52 ± 8%, P < 0.01), higher end-systolic volume (98 ± 49 ml vs. 73 ± 28 ml, P < 0.001) and larger scar volume (26 ± 19% vs. 11 ± 9%, P < 0.001). Extent of MVO was associated with the degree of MR quantified by 4D flow (R = 0.54, P = 0.0003). In uni-variate regression analysis, investigating the association of CMR variables to the degree of acute MR, only the extent of MVO was associated (coefficient = 0.27, P = 0.001). The area under the curve for the presence of MVO was 0.66 (P = 0.01) for MR > 2.5 ml. We conclude that in patients with reperfused STEMI, the degree of acute MR is associated with the degree of MVO. 
Original languageEnglish
Article number181
JournalBMC Research Notes
Volume15
DOIs
Publication statusPublished - 15 May 2022

Keywords

  • ST-segment elevation myocardial infarction
  • Magnetic resonance imaging
  • Haemodynamics
  • mitral regurgitation

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