[Prenatal aspects of the "small for date" infants projected into the 1st years of life].
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The relations between the maternal and foetal organisms during pregnancy are partly very complicated and remain inexplicable. Blastocyst, trophoblast, embryo and foetus have membrane antigens at a very early stage, and the immunocompetence of the foetus develops already during the second third of the pregnancy period. Many non-specific factors are involved in preventing the castingoff reaction of the foetal organism. The trophoblastic tissue is probably of central importance. The focal point of interest in trophoblast tissue research is probably the testing of the local action of HCG and HPL and perhaps also AFP, as well as the question whether cellular and nuclear fusions occur in the region of the syncytiotrophoblasts and the decidual base, or if leucocyte antibodies can block the HLA antigens or the trophoblastic surface.
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A double-blind clinical study of five preinduction scoring systems was undertaken to determine the accuracy of clinical usefulness of each system as applied to a diverse group of patients. When strictly applied, all five systems were found to be as accurate and useful as it was originally claimed they were. However, when applied without regard to each author's prerequisites, none of the five scoring systems was found to be reliable. A series of preinduction score modifiers is presented which, when applied to any of the preinduction scoring systems, will reliably predict the outcome of induction of labor, with a 50% induction failure rate in patients with lower third scores, a 10% failure for middle third scores, and essentially a 0% failure in the upper third scores.
In an attempt to circumvent the need for 24-hour urine collections for estriol analyses in assessment of fetal status, the possibility of using morning urine samples was investigated. Results indicate 1) good correlation between 24-hour estriol excretion and morning estriol concentration, and between corresponding E/C ratios, 2) similar morning and 24-hour estriol concentrations, 3) high dependence of estriol and creatinine excretion on 24-hour urine volume but not on morning volume, 4) larger variations in 24-hour than in morning urine volume, and 5) better consistency of values in morning than in 24-hour samples in pathologic pregnancy. The use of serial morning urine concentrations at least as an outpatient monitoring procedure is suggested.
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Determination of the creatinine concentration of the amniotic fluid was undertaken between the 25th and 40th week of gestation in 114 patients. The normal serum creatinine level was simultaneously determined in 43 of these patients. The aim of this study was to examine whether this parameter of fetal renal function allows a conclusion to be drawn with respect to fetal maturity and the length of gestation. With increasing length of gestation a marked increase in the amniotic fluid and the maternal serum creatinine concentration was observed (p less than 0.01). The large scatter of the values made it impossible to relate any particular creatinine concentration to a certain week of gestation. However, if the concentration of creatinine in the amniotic fluid has reached a value of 2 mg% or more, a mature baby can be predicted in most cases. A tendency to raised levels of creatinine was seen in cases of EPH gestosis and latent diabetes mellitus. The determination of creatinine in the amniotic fluid can be recommended with certain reservations as an additional method to assess fetal maturity.
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