低出生体重の赤ん坊の剖腹产率の増加. 結果への影響
M H Malloy1, G G Rhoads, W Schramm
1Prevention Research Program, National Institute of Child Health and Human Development, Bethesda, Md 20892.
JAMA
|September 15, 1989
まとめ
低出生体重の乳児の帝王切開は有意に増加したが,全生存率を改善することはなかった. 最小の乳児の早期死亡は,後の死亡によって相殺され,帝王切開による出産の増加の利益はほとんどなかった.
科学分野:
- 産周医学は,産周医学である.
- ネオナトロジーの新生児科
- 産科は産婦人科です.
背景:
- 低出生体重 (500~1499g) の乳児の剖腹产率の顕著な上昇は,1980年から1984年の間に発生しました.
- この期間に,他の乳児の体重グループでは,帝王切開の割合も増加した.
研究 の 目的:
- 帝王切開の頻度の増加が,出生体重が非常に低い乳児の生存率に与える影響を調査する.
- 帝王切開による出産が500~749gの乳児の生存に有益かどうかを判断する.
主な方法:
- ミズーリ州 (1980年−1984年) の出生証明書と死亡証明書のリンク分析.
- 帝王切開と経分娩の1日目の死亡率の比較,出生体重が非常に低い乳児について.
- 妊娠年齢やその他の潜在的な混同因子などの要因を統計的に調整する.
主要な成果:
- 生後1日目の死亡率は,帝王切開グループ (10%) で,出生体重が非常に低い乳児の陰道グループ (22%) と比較して低かった.
- この違いは,主に500〜740gの範囲の乳児によって引き起こされた (33%対59%の死亡率).
- しかし,この早期生存の利点は,その後の週における死亡の増加によって否定され,その結果,最初の週生存における有意な違いはなかった (オッズ比0.85).
結論:
- 研究期間中,出生体重が非常に低い乳児の剖腹产の急激な増加は,全生存率を改善する証拠がほとんどなかった.
- これらの脆弱な乳児に対する帝王切開の使用の増加は,母または胎児の苦痛とは無関係であるため,明確な理由が見つかりませんでした.
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