健康な80代における,年齢に関連した知能の低下と脳の白質の過濃度の関係:縦断的な研究
E Garde1, E L Mortensen, K Krabbe
1Danish Research Centre of Magnetic Resonance, Copenhagen University Hospital, Hvidovre. elleng@magnet.drcmr.dk
Lancet (London, England)
|September 1, 2000
まとめ
高齢者によく見られる白物質の強度上昇は,認知機能低下と関連しています. この研究では,これらのMRIの発見は,数十年にわたって知的機能の低下と関連しており,特に人生の最後の10年間で発見されました.
科学分野:
- 神経学 神経学とは
- ゲリアトリクス ゲリアトリクス
- 神経画像は,神経イメージングによるものです.
背景:
- ホワイトマター高強度症 (WMH) は,高齢者においてMRIによって頻繁に観察され,しばしば認知症があるか否かです.
- WMHの重度と認知障害の関係に関する以前の研究は,矛盾する結果をもたらしました.
- 年齢に関連する認知機能低下とその80代におけるWMHとの関連を調査するために,縦断研究が行われました.
研究 の 目的:
- 健康な高齢者の白質高強度 (WMH) と認知機能低下の間の縦断的な関係を調べる.
- 50歳から80歳までの知的機能の低下と周周体および深いWMHの関連性を評価する.
- 80歳になる前の10年の認知の変化に対するWMHの影響を決定する.
主な方法:
- 68人の健康な非認知症患者のコホートは,当初は1914年に生まれたより大きなグループの一部であったが,50,60,70,80歳の時,ウェクスラー成人知能スケール (WAIS) を使用した認知テストを繰り返し受けた.
- 脳磁気共鳴画像 (MRI) は,80歳から82歳までの参加者に実施されました.
- 周心室内および深部白質の強度が高さは,MRIスキャンで別々に定量化されました.
主要な成果:
- 周周静脈や深層白質の過濃度症は,80歳で全般的なIQスコアと関連付けられませんでした.
- この2種類の白質過濃度症候群は,50歳から80歳までのパフォーマンスIQの低下と有意に相関していました.
- 白い物質の過濃度と認知機能の低下との関連は,70~80歳の10年で最も顕著でした.
結論:
- 周周動脈および深部白質のハイパーインテンシティは,健康な八十代の人の知的衰退と関連しています.
- しかし,これらのMRIの発見だけでは,年齢に関連する認知機能低下における個々の変動のほんのわずかな部分しか説明できません.
- 高齢者の白質過濃度の診断解釈は,認知老化と複雑な関係があるため,慎重に検討する必要があります.
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