In the past year or two there has been renewed interest in the study of fetal activity, particularly in respect to the so-called intra-uterine respiratory movements. Such activity was first reported years ago, but its existence as a physiologic phenomenon has never been settled to the satisfaction of all. Thus, in the latest edition of "Williams' Obstetrics"1 it is stated that the conclusions regarding fetal respiratory movements have not been generally accepted and that doubt still exists as to the significance of some of the observations reported. In the light of new methods recently developed, renewed interest in the subject may serve to determine whether or not fetal respiratory movements in utero are physiologic and to solve some pertinent problems regarding the fetal and neonatal respiratory mechanism, some of which are the existence of a tidal flow of amniotic fluid in the respiratory passages of the fetus, the onset
BONAR BE, BLUMENFELD CM, FENNING C. STUDIES OF FETAL RESPIRATORY MOVEMENTS: I. HISTORICAL AND PRESENT DAY OBSERVATIONS. Am J Dis Child. 1938;55(1):1–11. doi:10.1001/archpedi.1938.01980070010001
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