合併症のない急性心筋梗塞後の交感性ニューラル過活性の時間経過
Lee N Graham1, Paul A Smith, John B Stoker
1Department of Cardiology, St James's University Hospital, Leeds, UK. lee@graham93.fsnet.co.uk
Circulation
|August 15, 2002
まとめ
合併症のない急性心筋梗塞 (AMI) の後,少なくとも6ヶ月間,交感性神経の活動は上昇しています. この持続的な交感性多動性は,心臓発作後の長期的な心血管リスクに寄与する可能性があります.
科学分野:
- 心血管生理学 心血管の生理学
- 自律神経系の研究
- 心筋梗塞の研究
背景:
- 急性心筋梗塞 (AMI) の後の交感神経系の活動に関するデータは限られている.
- 交感性ドライブの上昇は,AMIに関連する罹病率と死亡率に関連しています.
- プラズマカテキオラミンの一時的な上昇は観察されていますが,長期的な自律的変化はあまり理解されていません.
研究 の 目的:
- 合併症のないAMIの後,周辺部への中央シンパシー出力を定量化するために.
- AMI後のシンパティック活動の時間の経過を調査する.
- AMI患者における同情活動と対照群を比較する.
主な方法:
- 筋肉交感神経活動 (MSNA) と単単位MSNA (s-MSNA) は,13人のAMI患者で測定されました.
- 測定はAMIの2〜4日後に,また3ヶ月と6ヶ月後に行われました.
- コントロールグループには,健康な被験者,冠動脈疾患患者,非AMI入院患者が含まれていました.
主要な成果:
- AMI患者のMSNAおよびs-MSNAは,すべての時間点において,すべてのコントロールグループと比較して上昇していました.
- 交感活性は,AMI後3ヶ月で変化しなかった.
- AMI後6ヶ月でMSNAとs-MSNAの有意な減少が観察されたが,レベルは対照群よりも高いままだった.
- 交感性多動性は,左心室の放出分数と逆に相関していた.
結論:
- 合併症のないAMIの後,交感性多動性の長期的な状態が起こります.
- この持続的な多動性は,遅れた心血管疾患と死亡率に寄与すると示唆されています.
- ハイパーアクティビティは,心臓受容体から発する反射の障害に起因する可能性があります.
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