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Ischemia Index to predict post coronary artery bypass graft change in left ventricular ejection fraction
Rob A J P Ruth1, Galen S Wagner, Mohammed Soliman Hamad
1Maastricht University, Maastricht, The Netherlands. r.ruth@student.maastrichtuniversity.nl
Insights
The Ischemia Index shows a trend towards predicting left ventricular ejection fraction (LVEF) improvement after coronary artery bypass grafting (CABG), especially in patients without confounding ECGs. Further research with larger samples is needed for definitive conclusions.
Area of Science:
- Cardiology
- Cardiac Surgery
- Diagnostic Imaging
Background:
- Myocardial necrosis and ischemia reduce left ventricular ejection fraction (LVEF).
- Differentiating these factors aids decisions on coronary artery bypass grafting (CABG) efficacy.
- Accurate assessment is crucial for managing patients with reduced LVEF.
Purpose of the Study:
- To evaluate the Ischemia Index's ability to predict LVEF improvement post-CABG.
- To assess the relationship between the Ischemia Index and LVEF recovery.
- To investigate the influence of electrocardiographic confounders on this prediction.
Main Methods:
- Studied 55 patients with LVEF <40% undergoing CABG.
- Calculated an Ischemia Index by subtracting ECG-estimated infarction LVEF from measured LVEF.
- Grouped patients based on the presence or absence of confounding ECG factors.
Main Results:
- No significant correlation between Ischemia Index and LVEF improvement in the overall group (p=0.083).
- A strong trend (p=0.056) observed between Ischemia Index and LVEF improvement in patients without confounding QRS changes.
- Suggests potential predictive value in a specific subgroup.
Conclusions:
- The Ischemia Index may positively correlate with LVEF improvement post-CABG in patients without electrocardiographic confounders.
- Results indicate a potential clinical application for the Ischemia Index.
- A larger prospective study is recommended to validate these findings.
Introduction:
Both myocardial necrosis and ischemia can decrease the left ventricular ejection fraction (LVEF). An accurate estimate of the relative contributions of these irreversible and potentially reversible factors could lead to better decisions regarding the risk and benefit of coronary artery bypass grafting (CABG). The value of an Ischemia Index calculated by subtracting the ECG estimated infarction dependent LVEF from the measured LVEF to predict post-operative improvement of LVEF was studied in 55 patients with LVEF <40% before CABG. Patients were grouped according to absence or presence of other coexisting ECG confounders.
Results:
No significant (p=0.083) relationship was found between the Ischemia Index and the improvement in LVEF after CABG in the overall population, but a strong trend was present in the patients with ECGs without confounding QRS changes (p=0.056).
Conclusion:
These results suggest a positive relationship between the Ischemia Index and improvement of LVEF after CABG in patients without electrocardiographic confounders, but a prospective study using a larger sample is needed.
