Two-dimensional echocardiography with a 15-MHz transducer is a promising alternative for in vivo measurement of left ventricular mass in mice

H. J. Youn, G. Rokosh, Steven Jay Lester, P. Simpson, N. B. Schiller, E. Foster

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Abstract

Murine models of left ventricular (LV) hypertrophy recently have been developed. We tested the accuracy of 2-dimensional (2D) echocardiographic measurement of LV mass with high-frequency imaging in mice. Ten anesthetized mice (weight 20 to 31 g, aged 1 to 5 months) were examined with a 15-MHz transthoracic linear-array transducer. End-diastolic myocardial area (A)(epicardial - endocardial) from the parasternal short-axis view at the midpapillary level and LV length (L) from the parasternal long-axis view were measured to calculate LV mass with the area-length method (1.05 [5/6 x A x L]) and data were compared with LV-mass with the 2D guided M-mode method. Within 3 days of echocardiography, the hearts were removed and weighed after potassium-induced cardiac arrest. Two-dimensional echocardiographic measurement with a 15-MHz transducer was performed in all mice. LV chamber dimensions included end-diastolic septal (0.80 ± 0.12 mm) and posterior wall thickness (0.76 ± 0.13 ram), end-diastolic dimension (3.64 ± 0.28 mm), and end-systolic dimension (2.34 ± 0.32 mm). Echocardiographic LV mass with the area-length method, 2D guided M-mode method, and autopsy LV weight were 80.8 ± 16.1 mg, 97.6 ± 17.8 mg, and 78.8 ± 13.2 mg, respectively. A strong correlation existed between LV weight (x) and echocardiographic LV mass (y) with the area-length method: y = 0.745x + 18.9, r =0.908, standard error of estimate (SEE) = 5.9 mg, P < .0005. This correlation was stronger than that of LV weight (x) and echocardiographic LV mass (y) with the 2D guided M-mode method: y = 0.577x + 22.6, r =0.779, SEE = 8.8 mg, P = .008. These data suggest that serial in vivo measurements of LV mass with the 2D area-length method may be more accurate than M-mode methods in experimental murine models of LV pathology.

Original languageEnglish (US)
Pages (from-to)70-75
Number of pages6
JournalJournal of the American Society of Echocardiography
Volume12
Issue number1
DOIs
StatePublished - 1999
Externally publishedYes

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Transducers
Echocardiography
Weights and Measures
Induced Heart Arrest
Left Ventricular Hypertrophy
Autopsy
Potassium
Theoretical Models
Pathology

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

Cite this

Two-dimensional echocardiography with a 15-MHz transducer is a promising alternative for in vivo measurement of left ventricular mass in mice. / Youn, H. J.; Rokosh, G.; Lester, Steven Jay; Simpson, P.; Schiller, N. B.; Foster, E.

In: Journal of the American Society of Echocardiography, Vol. 12, No. 1, 1999, p. 70-75.

Research output: Contribution to journalArticle

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abstract = "Murine models of left ventricular (LV) hypertrophy recently have been developed. We tested the accuracy of 2-dimensional (2D) echocardiographic measurement of LV mass with high-frequency imaging in mice. Ten anesthetized mice (weight 20 to 31 g, aged 1 to 5 months) were examined with a 15-MHz transthoracic linear-array transducer. End-diastolic myocardial area (A)(epicardial - endocardial) from the parasternal short-axis view at the midpapillary level and LV length (L) from the parasternal long-axis view were measured to calculate LV mass with the area-length method (1.05 [5/6 x A x L]) and data were compared with LV-mass with the 2D guided M-mode method. Within 3 days of echocardiography, the hearts were removed and weighed after potassium-induced cardiac arrest. Two-dimensional echocardiographic measurement with a 15-MHz transducer was performed in all mice. LV chamber dimensions included end-diastolic septal (0.80 ± 0.12 mm) and posterior wall thickness (0.76 ± 0.13 ram), end-diastolic dimension (3.64 ± 0.28 mm), and end-systolic dimension (2.34 ± 0.32 mm). Echocardiographic LV mass with the area-length method, 2D guided M-mode method, and autopsy LV weight were 80.8 ± 16.1 mg, 97.6 ± 17.8 mg, and 78.8 ± 13.2 mg, respectively. A strong correlation existed between LV weight (x) and echocardiographic LV mass (y) with the area-length method: y = 0.745x + 18.9, r =0.908, standard error of estimate (SEE) = 5.9 mg, P < .0005. This correlation was stronger than that of LV weight (x) and echocardiographic LV mass (y) with the 2D guided M-mode method: y = 0.577x + 22.6, r =0.779, SEE = 8.8 mg, P = .008. These data suggest that serial in vivo measurements of LV mass with the 2D area-length method may be more accurate than M-mode methods in experimental murine models of LV pathology.",
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AU - Youn, H. J.

AU - Rokosh, G.

AU - Lester, Steven Jay

AU - Simpson, P.

AU - Schiller, N. B.

AU - Foster, E.

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