J Korean Med Sci.  2015 Jul;30(7):903-910. 10.3346/jkms.2015.30.7.903.

The Prognostic Value of the Left Ventricular Ejection Fraction Is Dependent upon the Severity of Mitral Regurgitation in Patients with Acute Myocardial Infarction

• Cho JS
• Youn HJ
• Her SH
• Park MW
• Kim CJ
• Park GM
• Jeong MH
• Cho JY
• Ahn Y
• Kim KH
• Park JC
• Seung KB
• Cho MC
• Kim CJ
• Kim YJ
• Han KR
• Kim HS
• the Korea Acute Myocardial Infarction Registry Investigators

• KMID: 2164475
• DOI: http://doi.org/10.3346/jkms.2015.30.7.903

Abstract

The prognostic value of the left ventricle ejection fraction (LVEF) after acute myocardial infarction (AMI) has been questioned even though it is an accurate marker of left ventricle (LV) systolic dysfunction. This study aimed to examine the prognostic impact of LVEF in patients with AMI with or without high-grade mitral regurgitation (MR). A total of 15,097 patients with AMI who received echocardiography were registered in the Korean Acute Myocardial Infarction Registry (KAMIR) between January 2005 and July 2011. Patients with low-grade MR (grades 0-2) and high-grade MR (grades 3-4) were divided into the following two sub-groups according to LVEF: LVEF < or = 40% (n = 2,422 and 197, respectively) and LVEF > 40% (n = 12,252 and 226, respectively). The primary endpoints were major adverse cardiac events (MACE), cardiac death, and all-cause death during the first year after registration. Independent predictors of mortality in the multivariate analysis in AMI patients with low-grade MR were age > or = 75 yr, Killip class > or = III, N-terminal pro-B-type natriuretic peptide > 4,000 pg/mL, high-sensitivity C-reactive protein > or = 2.59 mg/L, LVEF < or = 40%, estimated glomerular filtration rate (eGFR), and percutaneous coronary intervention (PCI). However, PCI was an independent predictor in AMI patients with high-grade MR. No differences in primary endpoints between AMI patients with high-grade MR (grades 3-4) and EF < or = 40% or EF > 40% were noted. MR is a predictor of a poor outcome regardless of ejection fraction. LVEF is an inadequate method to evaluate contractile function of the ischemic heart in the face of significant MR.

Keyword

Mitral Regurgitation; Acute Myocardial Infarction; Left Ventricular Ejection Fraction

MeSH Terms

Aged
Coronary Angiography
Coronary Artery Disease/mortality/*pathology/surgery
Echocardiography
Female
Heart/radiography
Humans
Male
Middle Aged
Mitral Valve Insufficiency/*pathology
Myocardial Infarction/mortality/*pathology/surgery
Myocardium/pathology
Percutaneous Coronary Intervention
Prospective Studies
Stroke Volume/*physiology
Treatment Outcome
Ventricular Dysfunction, Left/*surgery
Ventricular Function, Left/physiology

Figure

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  Fig. 1 Kaplan-Meier analysis of all-cause mortality, major adverse cardiac event (MACE), and cardiac death in the mitral regurgitation grades 0-2 (upper panel) and grades 3-4 (lower panel) groups of acute myocardial infarction patients. Primary endpoints were significant in the groups with mild mitral regurgitation (MR) according to ejection fraction (EF) (≤ 40% and > 40%). However, the groups with severe MR did not exhibit significant differences in all-cause mortality based on EF (≤ 40% and > 40%).

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