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  • Title: M-mode echocardiographic values in sheep.
    Author: Moses BL, Ross JN.
    Journal: Am J Vet Res; 1987 Sep; 48(9):1313-8. PubMed ID: 3662202.
    Abstract:
    M-mode echocardiograms were recorded from 21 adult sheep (20 ewes, 1 whether). Fifteen echocardiographic measurements were taken and compared with body weights or heart rates, using linear regression equations. Significant correlations (P less than 0.05) were found when body weight was compared with left ventricular internal dimensions in systole (Yo = 0.187 Xo + 18.60, P less than 0.05) and diastole (Yo = 0.346 Xo + 26.69, P less than 0.02), septal thickness in systole (Yo = 0.0876 Xo + 7.64, P less than 0.05) and diastole (Yo = 0.0673 Xo + 4.45, P less than 0.05), aortic root dimension (Yo = 0.129 Xo + 23.40, P less than 0.05), and left atrial dimension (Yo = 0.194 Xo + 15.95, P less than 0.005). Heart rate was significantly correlated (P less than 0.05) with body weight (Yo = -0.245 X 96.71, P less than 0.05), ejection time (Yo = -0.0013 Xo + 0.376, P less than 0.001), velocity of circumferential fiber shortening (Yo = 0.0061 Xo + 0.928, P less than 0.05), mean velocity of mitral valve middiastolic closure (Yo = -0.184 Xo + 1.65, P less than 0.02), and left atrial dimension (Yo = -0.109 + 40.55, P less than 0.005). Fractional shortening of the left ventricle was (mean) 37.2 +/- 5.7% and the left atrial to aortic root ratio was (mean) 0.92 +/- 0.10.
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