Abstract
Background
We evaluated the ability of transthoracic echocardiography (TTE) to correctly identify abnormal left ventricular (LV) size, function, and mass when compared to cardiac magnetic resonance (CMR). Whilst numerous studies have compared TTE and CMR with respect to correlation between measurements and study reproducibility, few have employed categorical analysis relevant to clinical practice.
Methods
Two hundred and fifteen consecutive patients who underwent both TTE and CMR were evaluated for the presence of abnormal LV size, systolic function, and mass. Abnormal LV systolic function was further categorized into grades (mild, moderate, and severe). Quantification of LV morphology and function was performed on TTE and CMR according to published guidelines. The level of agreement between TTE and CMR was compared across binary and categorical variables using Cohen’s kappa.
Results
Compared to CMR, TTE demonstrated excellent agreement in identification of abnormal versus normal function (κ = 0.87). However, agreement across grades of LV function was less strong (κ = 0.63). Whilst agreement for identification of severe LV dysfunction was good (κ = 0.68), this would still lead to misclassification of severe dysfunction in approximately one in seven cases. Agreement between TTE and CMR was moderate to good for identification of LV dilation (κ = 0.43–0.63), but poor for identification of increased mass (κ = 0.04).
Conclusions
Whilst in clinical practice TTE performs well in identification of normal versus abnormal systolic function, it has substantial limitations across grades of dysfunction and in the assessment of LV size and mass. These limitations have important implications when considering management decisions for patients based on thresholds of LV morphology or function.
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Abbreviations
- 2DE:
-
Two-dimensional echocardiography
- 3DE:
-
Three-dimensional echocardiography
- ACEI:
-
Angiotensin-converting enzyme inhibitors
- BMI:
-
Body mass index
- BSA:
-
Body surface area
- CMR:
-
Cardiac magnetic resonance
- EDV:
-
End-diastolic volume
- EF:
-
Ejection fraction
- ICD:
-
Implantable cardioverter-defibrillator
- LV:
-
Left ventricular
- LVEDD:
-
Left ventricular end-diastolic diameter
- TTE:
-
Transthoracic echocardiography
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Authors Andrew Taylor, James Hare, Leah Iles, Andris Ellims and Benedict Costello have multiple affiliations as Cardiologists with Heart Centre, Alfred Hospital, Melbourne and involvement in research opportunities with Baker IDI Heart and Diabetes Institute. No funding was allocated to this research project. Andrew Taylor, James Hare, Benedict Costello, Leah Iles, Andris Ellims and Jeffrey Alexis declare no conflicts of interest.
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All procedures performed in studies involving human participants were in accordance with ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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We conducted a retrospective study of de-identified data and therefore formal consent was not required.
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Alexis, J.A., Costello, B., Iles, L.M. et al. Assessment of the accuracy of common clinical thresholds for cardiac morphology and function by transthoracic echocardiography. J Echocardiogr 15, 27–36 (2017). https://doi.org/10.1007/s12574-016-0322-4
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DOI: https://doi.org/10.1007/s12574-016-0322-4