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Demonstrates in vivo ultrasound measurements of fetal heart dimensions relative to chest size, indicating proportional growth during the final eight weeks of pregnancy.
In the course of routine, two-dimensional ultrasonic echoscopy, echograms have been obtained which show the outline of the fetal heart and interventricular septum. Measurements of the echograms show the fetal heart to occupy 21% of the cross-sectional area of the chest at its widest transverse diameter and to occupy 52% of the transverse diameter of the chest at the same level. The ratio of the tranverse diameter of the left ventricle to that of the right (L.V. ÷ R.V.) is 1.23. The fetal heart grows at the same rate as the fetal chest in the last 8 weeks of pregnancy.
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Garrett et al. (1970) studied this question.
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