RT Journal Article
SR Electronic
T1 Relationship of functional mitral regurgitation to new-onset atrial fibrillation in acute myocardial infarction
JF Heart
JO Heart
FD BMJ Publishing Group Ltd and British Cardiovascular Society
SP 683
OP 688
DO 10.1136/hrt.2009.183822
VO 96
IS 9
A1 Fadel Bahouth
A1 Diab Mutlak
A1 Moran Furman
A1 Anees Musallam
A1 Haim Hammerman
A1 Jonathan Lessick
A1 Saleem Dabbah
A1 Shimon Reisner
A1 Yoram Agmon
A1 Doron Aronson
YR 2010
UL http://heart.bmj.com/content/96/9/683.abstract
AB 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.