Multiple Pregnancy
نویسنده
چکیده
I'HIS paper is based on a review of all cases of multiple pregnancy occurring in the Belfast Maternity Hospital, Townsend Street, and the Royal Maternity Hospital, Belfast, during the last ten years 1927-36. During this period, 164 mothers were delivered of twins, and one mother was delivered of triplets, i.e., 165 mothers gave birth to 331 babies. The number of twin pregnancies over this period represents a frequency of 1 in 50 births. The frequency of twin pregnancy is given by Curtisl to vary from 1 in 80 to 1 in 101 births, but it is possible that the higher incidence of this series is due to the fact that abnormalities gravitate to hospital, and the figures for this series, therefore, can hardly be regarded as a true index. At the same time, it has long been known that multiple pregnancy-occurs more frequently in this country and in Russia. The case of triplets herewith recorded represents a frequency of 1 in 8,243, but no reliance can be placed on one instance. We have not had the pleasure of delivering any more than three children at one confinement in these hospitals during the last ten years. Ihe most famous case of multiple pregnancy recorded in the literature is that of the I)ionnie quintuplets, and the story of their birth by Dafoe2 is most interesting reading. Twins may develop from the fertilization of one ovum, or of two separate ova. In the former case-they are known as uni-ovular, monozygotic, identical, or single-ovum twins, and in the latter as binovular, dizygotic, fraternal, or double-ovum twins. Binovular twins, being the result of fertilization of two ova, are really not twins biologically; they are examples of simultaneous development of two ova, the result of an inherited tendency to twinning. Uni-ovular twins, on the other hand, are true biological twins, being the splitting of a single ovum into two separate and complete components, i.e., twoing, twaining, or twinning. In the case of binovular twins, the ova may come from one ovary, or one from each ovary. They are the' more frequent, and may be of the same or different sex. There is a placenta for each ovum, which also possesses its own amnion and chorion. The four layers of the membranes can be shown in the septum uniting the two sacs, and the placentae may or may not be fused. Fusion depends on the proximity of …
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ورودعنوان ژورنال:
- The Ulster Medical Journal
دوره 6 شماره
صفحات -
تاریخ انتشار 1937