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The postnatal RV weight trajectory remains disputed; quantitative reappraisal is required to resolve conflicting historical observations.
Uniformity of opinion regarding the changes that occur in the weight of the right ventricle after Ibirth has not been reached yet. Thus, while Muller (1883) and Keen (1955) described the occurrence -of postnatal atrophy of the muscular mass of the right ventricle, Emery and Mithal (1961) found no evidence of such atrophy. According to them the right ventricle increases in weight from birth but more slowly than the left. One of the points at issue is whether, at the time of birth, the weight .of the right ventricle is equal to, greater than, or less than the weight of the left ventricle (Muller, 1883; Keen, 1955; Emery and Mithal, 1961; Sala Panisello et al., 1958; Emery and MacDonald, 1960). The confusion is partly due to the limited number of cases studied by some investigators: some series have included, in the same group, cases whose ages correspond to different stages in -the evolution of the cardiac mass and also some newborn infants with abnormally low body weight.
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Recavarren et al. (1964) studied this question.
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