Representative transthoracic high-frequency echocardiograms.

(A) Pulsed Doppler tracing of the left ventricular outflow tract measured just above the aortic valve without angle correction. (B) M-mode echocardiogram in the parasternal long-axis view. (C) Systolic diameter of the left ventricle (M-mode long-axis view, wt: 11 measurements in 6 mice; tg: 10 measurements in 5 mice) was significantly increased in tg mice, *P < .05.