Abstract
Increased sizes and dysfunction of the left atrium have been related to adverse outcomes. 3D-echocardiography is more accurate than 2D-echocardiography in estimating LA volumes and ejection fraction. However, the use of 3DE for LA analysis is limited by the absence of established reference values. We performed a systematic review and meta-analysis to provide reference ranges of LA maximum and minimum volumes indexed for body surface area (LAVi max and LAVi min, respectively), and LA-EF assessed by 3DE in healthy adults. Data search was conducted from inception through September 15, 2021, using the following Medical Subject Heading terms: left atrial/atrium, three-dimensional/3D echocardiography. The study protocol was registered in the PROSPERO database (CRD42021252428). 15 studies including 4,226 healthy adults (51% males) and reporting 3DE values of LAVi max, LAVi min and LA-EF were selected. LAVi max, LAVi min and LA-EF mean and reference values were equal to 25.18 ml/m2 (95% CI 23.10, 27.26), 11.10 ml/m2 (10.01, 12.18) and 55.94% (51.92, 59.96), respectively. No influential studies were identified. Pooled estimates per age group- and sex were also estimated. By meta-regression analyses, we identified variability in LA volumes and LA-EF depending on participants’ age, ethnicity and number of heart cycles at 3D multi-beat acquisition. At individual patient data analysis conducted on 374 subjects, a software effect on LA-EF was shown. This systematic review and meta-analysis provides reference values of LAVi max, LAVi min and LA-EF assessed by 3DE in healthy adults, encouraging 3DE evaluation of the LA evaluation in daily practice.
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Dr Georgiopoulos was supported by the Onassis Foundation under the special grant & support program for scholars’ association members (Grant No. R ZP 001/2019–2020) and by the European Association of Cardiovascular Imaging (Training Grant 2021). The other authors declare that no funds, grants, or other support were received during the preparation of this manuscript.
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SF and GG are responsible of initial study conception and design. Material preparation, data collection and analysis were performed by SF, GG, KP and MT. The first draft of the manuscript was written by SF, GG and KP. All authors revised and implemented the manuscript critically for important intellectual content and approved the final manuscript.
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Figliozzi, S., Georgiopoulos, G., Pateras, K. et al. Normal ranges of left atrial volumes and ejection fraction by 3D echocardiography in adults: a systematic review and meta-analysis. Int J Cardiovasc Imaging 38, 1329–1340 (2022). https://doi.org/10.1007/s10554-021-02520-9
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DOI: https://doi.org/10.1007/s10554-021-02520-9