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RE: ARTICLE BY DR. CRAIG

PETER GRUENWALD, MD
Am J Dis Child. 1964;107(1):102-103. doi:10.1001/archpedi.1964.02080060104016.
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To the Editor: A recent issue of this Journal contains a paper which should not go unchallenged. Craig1 reports in a study of "distensibility curves and expansion patterns of newborn lungs" on findings in 40 infant lungs which are, apart from casual remarks concerning one or another case, unidentified as to birth weight, length of survival, or gestational age. These parameters are all-important in the study and interpretation of infant lungs, and the weight of one lung in no way replaces them. It is, for instance, stated that "uniform and complete expansion was produced in the lungs of all premature infants without hyaline membranes except two." Table 1 shows that seven of the 13 infants in this group have lung weights below 10 gm and may be quite immature: these lungs expand uniformly because they have no alveoli. The remaining six include one of the exceptions; how many of

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