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Selective reduction (or multifetal pregnancy reduction or MFPR) is the practice of reducing the number of fetuses in a multifetal pregnancy, say quadruplets, to a twin or singleton pregnancy. Selective reduction is done for both medical and non-medical reasons. Medical issues generally related to multiple births include premature births, low birth weights, and associated medical problems. Non-medical reasons include that the couple or the mother do not feel that they are emotionally or financially ready to handle more than one child. Selective reduction can also be used to reduce a twin pregnancy to a singleton one. This is a less common but growing practice as the risks in twin pregnancies, while existent, are much lower than in higher-order multiple pregnancies.〔 This type of multifetal reduction has become more common as the practice of using fertility treatments, resulting in multifetal pregnancy, has become more common. ==Practice== The reduction procedure is generally carried out during the first trimester of pregnancy.〔Komaroff, Anthony. (Harvard Medical School Family Health Guide ), page 913 (Simon and Schuster 1999): “Selective reduction is usually performed during the first trimester....”〕 The most common method is to inject potassium chloride into the fetus's heart; the heart stops and the fetus dies as a result. Generally, the fetal material is reabsorbed into the woman's body. While the procedure generally reduces the over-all risk level for the remaining fetus or fetuses, reduction does have its own risks, including the possibility that one or more of the remaining fetuses will also die. Dr. Mark Evans, a New York City-based obstetrician-geneticist, and a group of doctors, developed the procedure for selective reduction in the 1980s.〔(【引用サイトリンク】title=Washington Post Magazine Examines Selective-Reduction Procedure For Pregnancies With Multiple Fetuses )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Selective reduction」の詳細全文を読む スポンサード リンク
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