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Influence of left bundle branch block on left ventricular volumes, ejection fraction and regional wall motion

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Abstract

Background. Left ventricular volumes, ejection fraction and regional wall motion are cardiac parameters which provide valuable information for patient management in a large variety of cardiac conditions. Differences in regional wall motion are of relevance in the field of cardiac resynchronisation therapy. We quantified three-dimensional echocardiographic measurements of left ventricular volumes, ejection and regional wall motion (e.g. expressed as systolic dyssynchrony index (SDI)) in two patient cohorts: patients with normal conduction and patients with complete left bundle branch block.

Methods. Thirty-five patients scheduled for routine cardiac examination underwent three-dimensional echocardiography: 23 patients with normal conduction and 12 patients with a complete left bundle branch block. Full-volume datasets were analysed and end-systolic volume (ESV), end-diastolic volume (EDV) and ejection fraction (EF) were obtained. SDI was derived from the standard deviation of the measured times to reach minimal regional volume for each of the 16 segments of the left ventricle.

Results. A significant difference was observed in left ventricular volumes, ejection fraction and SDI between the two groups. Patients with complete left bundle branch block showed higher EDV (p=0.025) and ESV (p<0.01) and a lower EF (p<0.01) than patients with normal conduction. SDI is significantly higher in patients with complete left bundle branch block (p=0.004) expressing a higher amount of ventricular dyssynchrony. Intraobserver variability showed excellent correlation coefficients: r=0.99 for EDV, ESV and SDI and r=0.98 for EF.

Conclusion. Three-dimensional echocardiography is a feasible and reproducible method for the quantification of left ventricular volumes, left ventricular ejection fraction and regional wall motion. Differences can be assessed between normal patients and patients with left bundle branch block. (Neth Heart J 2007;15:89-94.)

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    J. A. Brunekreeft

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  1. J. A. Brunekreeft
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  2. M. Graauw
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  3. P. A. R. de Milliano
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  4. J. T. Keijer
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Department of Cardiology, Hilversum Hospital, Hilversum, the Netherlands

Correspondence to: J.A. Brunekreeft Department of Cardiology, Tergooi Hospitals, location Hilversum, PO Box 10016, 1201 DA Hilversum, the Netherlands E-mail: ja.brunekreeft@student.vu.nl

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Brunekreeft, J.A., Graauw, M., de Milliano, P.A.R. et al. Influence of left bundle branch block on left ventricular volumes, ejection fraction and regional wall motion. NHJL 15, 89–94 (2007). https://doi.org/10.1007/BF03085961

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