産後うつ病と間違われ長年見過ごされる危険性:シーハン症候群の知られざる症状と診断の遅れ episode artwork

EPISODE · Oct 17, 2025 · 7 MIN

産後うつ病と間違われ長年見過ごされる危険性:シーハン症候群の知られざる症状と診断の遅れ

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シーハン症候群: シーハン症候群は、分娩時または直後の大量出血による低血圧やショックが原因で、下垂体前葉が虚血性壊死を起こすことにより発症する産後下垂体機能低下症です。発展途上国では下垂体機能低下症の主要因であり、先進国でも報告例があります。 1. 病因と病態生理 妊娠中の下垂体はエストロゲンの影響で肥大し、虚血に対して脆弱になります。分娩時の急激な血圧低下が血流障害を引き起こし、壊死に至ります。トルコ鞍のサイズ、DIC、自己免疫反応も関与する可能性があります。結果として、成長ホルモン(GH)をはじめとする複数のホルモンが欠損し、汎下垂体機能低下症を呈します。 2. 臨床症状 最も重要な初期症状は、産後の授乳不全(プロラクチン欠損)と月経再開不全(ゴナドトロピン欠損)です。その他、倦怠感、低血糖、低ナトリウム血症、耐寒性低下、性欲減退などがみられます。身体所見としては、GH・エストロゲン欠乏による顔面の細かいしわや、ACTH欠損による皮膚の蒼白が特徴です。 3. 精神症状と誤診 精神症状(抑うつ、幻覚、認知障害など)が前面に出る場合、産後うつ病と誤診されることが多く、診断が平均7〜15年遅れることがあります。精神科的治療が先行し、内分泌疾患としての認識が遅れる臨床的課題です。系統的な誤診頻度データはないものの、多数の症例報告が存在します。 4. 診断 診断には、分娩歴の聴取、ホルモン基礎値と動態試験(ITT、TRH、GnRH、CRH負荷試験)、MRIによる画像診断が用いられます。慢性期には「空のトルコ鞍」が特徴的です。急性期には下垂体の腫大が見られることもあります。 5. 鑑別と治療 鑑別すべき疾患にはリンパ球性下垂体炎、原発性空トルコ鞍症候群、下垂体卒中などがあります。治療は生涯にわたるホルモン補充療法が基本で、グルココルチコイド、甲状腺ホルモン、性ホルモン、GHなどを補充します。特にACTH欠損症では副腎クリーゼ予防のため、甲状腺ホルモン補充に先立ってステロイド投与が必要です。適切な治療により、精神症状も含めて劇的な改善が期待できます。 — 原著のリンク: 産後うつ病と誤診されたシーハン症候群の頻度、臨床症状、および経過 ライセンス: CC-BY 4.0 https://creativecommons.org/licenses/by/4.0 書誌事項: OIO. (2024年3月24日). 産後うつ病と誤診されたシーハン症候群の頻度、臨床症状、および経過. OIO Online. https://plaza.umin.ac.jp/~OIO/?p=3908 改変と限界: 本コンテンツは参照した論文の内容に基づいて、生成AIによりその内容をまとめなおしたものです。 AIの限界としてハルシネーションが知られています。漢字の読み間違いが存在します。

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産後うつ病と間違われ長年見過ごされる危険性:シーハン症候群の知られざる症状と診断の遅れ

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