In a recent study, methods used to assess fetal well-being in early pregnancy included ultrasonography.
However, before a live embryo visualized in the intrauterine gestational sac and yolk sac, it can be difficult to differentiate between normal and abnormal pregnancy.
As a result, repeat examinations after an interval were performed as and usual method.
We wished to assess the usefulness of high resolution transvaginal sonography to determine whether there any features that would enable us to tell distinction at the time of first examination.
We studied normal early pregnancy 40 cases and abnormal early pregnancy 30 cases between pregnancy 4 weeks and 12 weeks.
@ES The results were summarized as follows:
@EN 1. There was no statistically significant difference between normal and abnormal pregnancy group about mean age, mean delivery number, mean gastational weeks(P>0.1).
2. The transvaginal sonography (TVS) detected, on the average, the same embryonal structures about 5 days earlier (gestational sac; 4.2 days, yolk sac; 6.1 days, fetal heart beat; 5.3 days) than the generally used transabdominal sonography (TAS),
and
there was significant difference in two sonography(P<0.01).
3. With regard to the pathologic gestational sac, there was no significant difference in size, shape and trophoblastic reaction using by TVS and TAS but biologic variation was much more decreased from ±9 days to±3 days in TVS because of no
bladder-filling.
4. With regard to the discriminatory zone using by TVS, this level has been adjusted to a much lower level, from 2640mIU/ml to 760mIU/ml, than that of TAS, and there was a significant difference in two sonography (P5. The yolk sac diameters demonstrated wide biologic variation across the gestational age between normal and abnormal pregnancy using TVS and TAS, and there was no significant difference in two sonography (P>0.1), but basic yolk sac structure was
detected one week earlier, on the average, by TVS than TAS. All of the cases that the yolk sac size was smaller than 3.5mm were proved to be abnormal pregnancy.
6. With regard to the growth curve of fetal crown-rump length, there was no significant difference in two sonography (P>0.1) but more or less strong correlation with gestational age in TVS.
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