Author + information
- Received August 12, 2011
- Accepted August 19, 2011
- Published online October 1, 2011.
- J. Tobias Kühl, MD, MA⁎,⁎ (, )
- Jacob E. Møller, MD, DMSc⁎,
- Thomas S. Kristensen, MD, PhD†,
- Henning Kelbæk, MD, DMSc⁎ and
- Klaus F. Kofoed, MD, DMSc⁎,†
- ↵⁎Reprint requests and correspondence:
Dr. J. Tobias Kühl, Department of Cardiology, 2012, the Heart Centre, Rigshospitalet, University of Copenhagen, Blegdamsvej 9, 2100-Cph, Copenhagen, Denmark
Objectives We sought to test the hypothesis that measures of left atrial (LA) function are independent predictors of mortality in patients with acute myocardial infarction.
Background Left atrial maximal volume (LAmax) is known to predict mortality in patients with acute myocardial infarction. In a previous pilot study, however, we found that LA function in terms of fractional change and left atrial ejection fraction (LAEF) assessed by multidetector computed tomography (MDCT) is more closely related to clinical heart failure than LAmax.
Methods We prospectively included 384 patients presenting with non–ST-segment elevation myocardial infarction (NSTEMI) who underwent retrospectively gated, 64-slice MDCT coronary angiography and subsequent measurements of LA size and function. All patients were treated according to the current guidelines based on invasive coronary angiography. Patients were followed for a minimum of 2 years. The study endpoint was all-cause mortality.
Results The median follow-up time was 36 months (range 10 to 1,551 days). During follow-up, 35 (9%) patients died. Overall, 1- and 2-year survival in the study cohort was 97% and 94%. LA size and mechanical function was obtained in all patients: mean LAmax was 55 ± 11 ml/m2, LA minimal volume 31 ± 11 ml/m2, fractional change 45 ± 9%, and LAEF 32 ± 9%. Using a Cox proportional hazards model with adjustments for age, number of diseased coronary vessels, left ventricular ejection fraction (LVEF), and Killip class, both fractional change (hazard ratio [HR]: 0.65; 95% confidence interval [CI]: 0.45 to 0.94) and LAEF (HR: 0.63; 95% CI: 0.44 to 0.91) remained independent predictors of mortality. In contrast to this, LAmax was not significantly associated with an increased risk of mortality in this population.
Conclusions In a low-risk group of patients with NSTEMI, reduced LA function is an independent predictor of mortality and provides prognostic value incremental to that of LAmax.
The study was supported by the John and Birthe Meyer Foundation and Michaelsen Fonden (Copenhagen, Denmark). All authors have reported that they have no relationships relevant to the contents of this paper to disclose.
- Received August 12, 2011.
- Accepted August 19, 2011.
- American College of Cardiology Foundation