Key result
Acute ischaemic mitral regurgitation after first MI is driven by papillary muscle separation (21.7 vs 20.0 mm, P=0.01) and excess angulation (38.4° vs 31.4°, P=0.0009) rather than apical displacement.
Why the study?
What are the unique geometric and dynamic mechanisms of functional mitral regurgitation in acute myocardial infarction compared to chronic MI?
Observational (n=218)
What are the unique geometric and dynamic mechanisms of functional mitral regurgitation in acute myocardial infarction compared to chronic MI?
Absolute Event Rate: 38.4% vs 31.4%
p-value: p=0.0009
In acute MI, ischaemic mitral regurgitation is driven by papillary muscle separation and excess angulation rather than the apical displacement seen in chronic IMR.
Acute IMR mechanisms differ from chronic on 3D echo; hypothesis-generating for targeted interventions but should not yet change practice.
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Kimura et al. (2018) conducted an observational in Acute myocardial infarction with ischaemic mitral regurgitation (n=218). Acute ischaemic mitral regurgitation vs. No ischaemic mitral regurgitation was evaluated on Papillary muscle angulation (p=0.0009). Acute ischaemic mitral regurgitation after first MI is driven by papillary muscle separation (21.7 vs 20.0 mm, P=0.01) and excess angulation (38.4° vs 31.4°, P=0.0009) rather than apical displacement.
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