title: Predictors of recovery of left ventricular systolic dysfunction after acute myocardial infarction: from the korean acute myocardial infarction registry and korean myocardial infarction registry.
abstract: OBJECTIVE
  We investigated the predictors of the recovery of depressed left ventricular ejection fraction (LVEF) in patients with moderate or severe left ventricular (LV) systolic dysfunction after acute myocardial infarction (MI).
  
  
  METHODS
  We analyzed 1307 patients, who had moderately or severely depressed LVEF (<45%) on echocardiography soon after acute MI and who underwent a follow-up echocardiography, among 27369 patients from the Korea Working Group on the Myocardial Infarction Registry. Patients were categorized into two groups according to recovery of LVEF: group I with consistently depressed LVEF (<45%) at the follow-up echocardiography and group II with a recovery of LVEF (≥45%).
  
  
  RESULTS
  Recovery of LV systolic dysfunction was observed in 51% of the subjects (group II, n=663; ΔLVEF, 16.2±9.3%), whereas there was no recovery in the remaining subjects (group I, n=644; ΔLVEF, 0.6±7.1%). In the multivariate analysis, independent predictors of recovery of depressed LVEF were as follows {odds ratio (OR) [95% confidence interval (CI)]}: moderate systolic dysfunction {LVEF ≥30% and <45%; 1.73 (1.12-2.67)}, Killip class I-II {1.52 (1.06-2.18)}, no need for diuretics {1.59 (1.19-2.12)}, non-ST-segment elevation MI {1.55 (1.12-2.16)}, lower peak troponin I level {<24 ng/mL, median value; 1.55 (1.16-2.07)}, single-vessel disease {1.53 (1.13-2.06)}, and non-left anterior descending (LAD) culprit lesion {1.50 (1.09-2.06)}. In addition, the use of statin was independently associated with a recovery of LV systolic dysfunction {OR (95% CI), 1.46 (1.07-2.00)}.
  
  
  CONCLUSIONS
  Future contractile recovery of LV systolic dysfunction following acute MI was significantly related with less severe heart failure at the time of presentation, a smaller extent of myonecrosis, or non-LAD culprit lesions rather than LAD lesions.
authors.affiliation: Division of Cardiology, Department of Internal Medicine, Gil Hospital, Gachon University, Incheon, Korea.
authors.forename: Pyung Chun
authors.initials: PC
authors.lastname: Oh
authors.forename: In Suck
authors.initials: IS
authors.lastname: Choi
authors.forename: Taehoon
authors.initials: T
authors.lastname: Ahn
authors.forename: Jeonggeun
authors.initials: J
authors.lastname: Moon
authors.forename: Yeonjeong
authors.initials: Y
authors.lastname: Park
authors.forename: Jong Goo
authors.initials: JG
authors.lastname: Seo
authors.forename: Soon Yong
authors.initials: SY
authors.lastname: Suh
authors.forename: Youngkeun
authors.initials: Y
authors.lastname: Ahn
authors.forename: Myung Ho
authors.initials: MH
authors.lastname: Jeong
keywords: Acute myocardial infarction; Prognosis; Ventricular ejection fraction
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