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Heart rhythm disorders
Relationship of functional mitral regurgitation to new-onset atrial fibrillation in acute myocardial infarction
  1. Fadel Bahouth1,2,
  2. Diab Mutlak1,2,
  3. Moran Furman1,2,
  4. Anees Musallam1,2,
  5. Haim Hammerman1,2,
  6. Jonathan Lessick1,2,
  7. Saleem Dabbah1,2,
  8. Shimon Reisner1,2,
  9. Yoram Agmon1,2,
  10. Doron Aronson1,2
  1. 1Department of Cardiology, Rambam Medical Center, Haifa, Israel
  2. 2The Rappaport Faculty of Medicine and Research Institute, Technion, Israel Institute of Technology, Bat Galim, Haifa 31096 Israel
  1. Correspondence to Dr Doron Aronson, Department of Cardiology, Rambam Medical Center, Bat Galim, POB 9602, Haifa 31096, Israel; daronson{at}tx.technion.ac.il

Abstract

Background/objective The role of factors that increase left atrial pressure or cause acute left atrial dilatation is frequently emphasised in the pathogenesis of atrial fibrillation (AF) in patients with acute myocardial infarction (AMI). This study was designed to test the hypothesis that functional mitral regurgitation (FMR) occurring after AMI may promote AF by producing left atrial volume overload.

Setting Intensive care unit of a tertiary care hospital.

Patients and Methods 1920 patients admitted with AMI were studied. Patients with known AF were excluded. FMR was classified using echocardiography into three groups: none; mild FMR and moderate or severe FMR. The relationship between FMR and AF occurring at any time during the hospital course was examined using multivariable logistic regression.

Results Mild FMR was present in 744 patients (38.8%) and moderate or severe FMR was present in 150 patients (7.8%). AF developed in 51 (5.0%), 83 (11.2%) and 28 (18.7%) patients with no FMR, mild FMR and moderate or severe FMR, respectively (p trend <0.001). In multivariable logistic regression, both mild (odds ratio (OR) 1.6; 95% CI 1.1 to 2.3, p=0.02) and moderate or severe FMR (OR 2.1; 95% CI 1.2 to 3.6, p=0.007) were independent predictors of AF. There was a significant interaction between the left ventricular ejection fraction and FMR (p=0.003) such that mild FMR was predictive of AF only in patients with a reduced (<45%) ejection fraction.

Conclusions There is a graded independent association between the severity of FMR and the new onset of AF in patients with AMI.

  • Acute coronary syndrome
  • atrial arrhythmia
  • mitral regurgitation

https://doi.org/10.1136/hrt.2009.183822

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    Footnotes

    • Competing interests None.

    • Ethics approval This study was conducted with the approval of the Rambam Medical Center.

    • Provenance and peer review Not commissioned; externally peer reviewed.