臨床婦人科産科61巻1号

2007年01月発行

今月の臨床 高年妊娠-母児ケアのポイント

高年妊娠の産科リスク

著者： 藤森敬也¹ 園田みゆき¹ 佐藤章¹

所属機関： ¹福島県立医科大学医学部産科婦人科学講座

ページ範囲：P.14 - P.19

文献概要

はじめに

　近年，欧米をはじめ日本においても，出産年齢が高くなる傾向が著しい．日本においては1970年と2000年を比較すると，初めての子供を出産する年齢が25.6歳から28.0歳へと上昇してきている．高年出産とは，世界産婦人科連合（FIGO）では，初産婦が35歳以上，経産婦では40歳以上と定義している．日本においては，高年初産婦を35歳以上の初産婦とすると定義しているが，経産婦での定義はなされていない．

　日本において35歳以上で出産した全出産数との割合は，1960～1980年では4.2～5.8％程度であったが，1990年では8.6％となり，以後増加をつづけ2003年では14.0％となった．40歳以上の高年出産をみると，1970年には全出産数との割合では0.5％であったものが，2003年では1.6％と約3倍増加してきている^1）．高年出産は染色体異常や多胎が多いこと，帝王切開（以下，帝切と略す）分娩が多いことが知られている．

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