Article Text
Abstract
Background: The selection of patients for prophylactic implantable cardioverter-defibrilator (ICD) treatment after myocardial infarction (MI) remains controversial.
Aim: To determine the optimum left ventricular ejection fraction (LVEF) dichotomy limit for ICD treatment in patients with a history of MI.
Methods and results: Data from the placebo arms of four randomised trials were pooled to create a cohort of 2828 patients (2206 men, mean (SD) age 65 (11) years) with reduced left ventricular function after MI. The median LVEF was 33% (range 6–40%). LVEF significantly predicted mortality. Each 10% reduction in LVEF <40% conferred a 42% increase in all-cause mortality, a 39% increase in arrhythmic cardiac mortality and a 49% increase in non-arrhythmic cardiac mortality over the 2-year period of follow-up (p<0.001 for all modes of mortality). As the LVEF progressively decreased from ⩽40% to ⩽10%, the data show a U-shaped relationship between the dichotomy limit for LVEF used and the number of patients who must be treated to prevent one arrhythmic death in 2 years. At an LVEF of 16–20%, more patients are likely to die from arrhythmic than non-arrhythmic cardiac deaths, whereas in those with LVEF ⩽10% all deaths were non-arrhythmic. However, the total number of deaths substantially decreased with lower LVEF.
Conclusion: A trade-off exists between the sensitivity and positive predictive accuracy across a range of LVEF, and no single dichotomy limit is completely satisfactory. In patients with LVEF ⩽10% ICD treatment was not beneficial as all patients in this subgroup died from non-arrhythmic causes. The use of a single dichotomy limit for LVEF alone is not sufficient in selecting patients for ICD treatment in the primary prevention of cardiac arrest.
- AMI, acute myocardial infarction
- DIAMOND-MI, Danish Investigation of Arrhythmias and Mortality On Dofetilide-Myocardial Infarction
- EMIAT, European Myocardial Infarct Amiodarone Trial
- ICD, implantable cardioverter defibrillator
- LVEF, left ventricular ejection fraction
- MADIT II, Multicenter Automatic Defibrillator Implantation Trial II
- MI, myocardial infarction
- TRACE, TRAndolapril Cardiac Evaluation
Statistics from Altmetric.com
- AMI, acute myocardial infarction
- DIAMOND-MI, Danish Investigation of Arrhythmias and Mortality On Dofetilide-Myocardial Infarction
- EMIAT, European Myocardial Infarct Amiodarone Trial
- ICD, implantable cardioverter defibrillator
- LVEF, left ventricular ejection fraction
- MADIT II, Multicenter Automatic Defibrillator Implantation Trial II
- MI, myocardial infarction
- TRACE, TRAndolapril Cardiac Evaluation
Footnotes
-
Published Online First 18 January 2007
-
Competing interests: None.