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Assessment of left ventricular function from the electrocardiogram in left bundle branch block
S H Recke1, H D Esperer, U Eberlein
1University Heart Centre, Erlangen, F.R.G.
International Journal of Cardiology
|September 1, 1989
Summary
QRS duration on ECG effectively predicts left ventricular function in patients with left bundle branch block. Shorter durations suggest normal function, while longer durations indicate impaired ejection fraction.
Area of Science:
- Cardiology
- Electrocardiography
- Cardiac Electrophysiology
Background:
- Left bundle branch block (LBBB) complicates the assessment of left ventricular (LV) function using standard electrocardiography.
- Identifying non-invasive predictors of LV end-diastolic volume index (LVEDVI) and ejection fraction (LVEF) in LBBB patients is clinically significant.
Purpose of the Study:
- To identify electrocardiographic predictors of LVEDVI and LVEF in patients with complete LBBB.
- To evaluate the diagnostic accuracy of specific ECG parameters for assessing LV dimensions and systolic function.
Main Methods:
- Analysis of QRS duration, S wave amplitude, S-T wave sum, and T wave polarity in 165 LBBB patients.
- Multivariate analysis to determine the discriminatory power of ECG parameters.
- Correlation analysis between ECG parameters and LVEDVI/LVEF measurements.
Main Results:
- QRS duration, maximal S wave amplitude, and T wave polarity were selected by multivariate analysis.
- QRS duration showed the best single correlations with LVEDVI (r=0.57) and LVEF (r=-0.63).
- QRS duration < 140 ms predicted normal LVEDVI/LVEF (sensitivity 100%); QRS duration > 170 ms predicted depressed LVEF < 55% (specificity 98%).
Conclusions:
- QRS duration is a valuable electrocardiographic predictor for evaluating LV function in LBBB.
- ECG parameters, particularly QRS duration, can guide the assessment of LVEDVI and LVEF in LBBB patients.
- QRS duration alone offers a reliable reference for LV function assessment in the presence of LBBB.