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Am J Physiol Heart Circ Physiol 280: H1954-H1962, 2001;
0363-6135/01 $5.00
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Vol. 280, Issue 5, H1954-H1962, May 2001

Accuracy of echocardiographic estimates of left ventricular mass in mice

Keith A. Collins1, Claudia E. Korcarz1, Sanjeev G. Shroff2, James E. Bednarz1, Richard C. Fentzke1, Hua Lin1, Jeffrey M. Leiden1, and Roberto M. Lang1

1 Noninvasive Cardiac Imaging Laboratory, University of Chicago, Chicago, Illinois 60637; and 2 Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261

Genetically modified mice have created the need for accurate noninvasive left ventricular mass (LVM) measurements. Recent technical advances provide two-dimensional images adequate for LVM calculation using the area-length method, which in humans is more accurate than M-mode methods. We compared the standard M-mode and area-length methods in mice over a wide range of LV sizes and weights (62-210 mg). Ninety-one CD-1 mice (38 normal, 44 aortic banded, and 9 inherited dilated cardiomyopathy) were imaged transthoracically (15 MHz linear transducer, 120 Hz). Compared with necropsy weights, area-length measurements showed higher correlation than the M-mode method (r = 0.92 vs. 0.81), increased accuracy (bias ± SD: 1.4 ± 27.1% vs. 36.7 ± 51.6%), and improved reproducibility. There was no significant difference between end-systolic and end-diastolic estimates. The truncated ellipsoid estimation produced results similar in accuracy to the area-length method. Whereas current echocardiographic technology can accurately and reproducibly estimate LVM with the two-dimensional, area-length formula in a variety of mouse models, additional technological improvements, rather than refinement of geometric models, will likely improve the accuracy of this methodology.

disease models; echocardiography; methods


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