The practice of obstetrics, designed for the use of students and practitioners of medicine . rculation is interrupted while the head is still in the vagina and remote from atmos-pheric air. There are a number of conditions which favor the development ofasphyxia and which are divisible into maternal and fetal. Such conditions donot produce a forcible shutting-off of the oxygen supply, and the mechanismby which asphyxia develops in these cases is by no means clear. There occursa suppression in the amount of oxygen which reaches the fetus, either becauseof scarcity of that substance in the matern
The practice of obstetrics, designed for the use of students and practitioners of medicine . rculation is interrupted while the head is still in the vagina and remote from atmos-pheric air. There are a number of conditions which favor the development ofasphyxia and which are divisible into maternal and fetal. Such conditions donot produce a forcible shutting-off of the oxygen supply, and the mechanismby which asphyxia develops in these cases is by no means clear. There occursa suppression in the amount of oxygen which reaches the fetus, either becauseof scarcity of that substance in the maternal blood, or of some anomaly of thefetal organs which interferes with the oxj^genation of the blood. Hemorrhagein the mother, by greatly reducing the number of red corpuscles, and therebyinterfering with the oxygen supply, becomes a cause of asphyxia. In fetalasphyxia from eclampsia the shutting-off of the oxygen supply might be dueto interference with maternal respiration or to a tetanic condition of the after the fetus is born can the various conditions, such as persistence. Fig. 1009.—Face of a Newly Born ChildCovered by a Portion of the possible cause of asphyxia in the newlyborn. 816 THE PATHOLOGY OF THE NEWLY BORN. of the foramen ovale, atresia of the pulmonary artery, etc., come into from interference with pulmonary respiration begin to be operativebefore delivery to the extent that the entrance of maternal secretions, meconium,etc., into the breathing passages may obstruct the first efforts at respiration. Per-sistence of the membranes unruptured will have the same effect; likewise thefact of so-called vaginal birth (Fig. 1009). Again, when the child first attemptsto breathe by the lungs the presence of a disease or malformation may be evidentfor the first time; e. g., atresia of the pulmonary artery, persistence of the foramenovale, congenital atelectasis. An entirely different mechanism obtains in asphyxiafrom brain compression. W
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
