The hearts from 31 fetuses aged from 12 to 40 weeks' gestation were dissected after fixation. The right ventricle and the left ventricle plus septum were weighed separately and a ratio was established. The total and separate ventricular weights increase steadily with age and at a similar rate. Throughout fetal life the left ventricle plus septum is larger than the right ventricle, but the right ventricle forms a greater proportion of the total ventricular weight than it does in the child or the adult.
For the first time, a table of normal fetal heart weights and ratios obtained using the method of Fulton, Hutchinson, and Jones (1952) is presented.
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