Abstract
Background
Left ventricular recovery (LVR) and adverse left ventricular remodelling (aLVR) after acute myocardial infarction (AMI) play an important prognostic role.
Purpose
Our aim was to evaluate the usefulness of non-invasive myocardial work (MW), a new index of global and regional myocardial performance, to predict LVR and aLVR.
Methods
Fifty patients with AMI (mean age, 63,8±13,4 years), treated by percutaneous coronary intervention (PCI), were prospectively enrolled and underwent a transthoracic Doppler echocardiography within 48 hours after PCI and a median of 31 days at follow-up. Myocardial work is derived from the strain-pressure relation, integrating in its calculation the non-invasive arterial pressure. Segmental LVR was defined as an absolute improvement of left ventricular ejection fraction (LVEF) ≥5% from LVEF at the baseline. The aLVR was defined as an increase of ≥20% of the LV end diastolic volume (LVEDV) at 1 month follow up.
Results
We found significant differences between the baseline and the follow-up value of LVEF (49,28 vs 52,80 p=0.001), Global Longitudinal Strain (GLS) (−13,41 vs −18,72, p=0.016), Global Work Index (GWI) (1368,68 vs 1788,08, p<0.0001), Global Work Efficiency (GWE) (86,96 vs 91,36, p=0.001), and Global Constructive Work (GCW) (1619,16 vs 2008,68, p<0.0001). The LVR at 1 month of follow-up was observed in 36% of the population enrolled, whereas aLVR was described in 18% of cases. Using ROC curve analysis, we identified a cut off value of 137 mmHg/% for baseline Global Wasted Work (Sensitivity 100%, Specificity 57,14%, AUC 0.6667, CI 95%: 0,51618- 0,81715, p<0.0001) to identify patients with aLVR at 1 month. With regards to conventional echo parameters, patients with LVR showed lower baseline Wall Motion Score Index (WMSI) than those with LVR (1,73 vs 1,38, p=0.007).
Conclusions
Baseline global wasted work can predict early adverse left ventricular remodelling at 1 months after AMI. These parameters could be used at baseline in order to predict worse outcome in AMI patients. Further larger scale studies are needed to validate these findings.
FUNDunding Acknowledgement
Type of funding sources: None.
Persistent st-segment elevation after primary stenting for acute myocardial infarction: Its relation to left ventricular recovery