普通の犬の心臓におけるインターカヴァルブロック: 末端の頂線の役割
1University of Heidelberg, Department of Cardiology, Heidelberg, Germany. ruediger_becker@med.uni-heidelberg.de
Circulation
|May 23, 2001
まとめ
誘導性インターカバル伝導ブロックは,健康な心臓では一般的です. ターミナル・クライスト ターミナル・クライスト ターミナル・クライスト
科学分野:
- 心臓病学 心臓病学
- 電気生理学 電気生理学
- 心臓の解剖学 心臓の解剖学
背景:
- 典型的な心房の振動の間隔の伝導ブロックは,既存の伝導異常を示唆しています.
- 導電ブロックにおける端末頂部領域の役割を調査することは極めて重要です.
研究 の 目的:
- 終端の頂部地域における伝導ブロックの位置と電気生理学的根拠を正確に特定する.
- インターカバルブロックにおけるアニゾトロピック伝導と耐火性グラデーションの役割を理解するために.
主な方法:
- 高密度パッチ電極 (10x10双極) が,フォックスハウンドの末端のとペクチナート筋肉に使用されました.
- 局所活性化パターンと効果的な耐火期は,ペースとエクストラ刺激の間にマッピングされました.
- エピカルディアルブロックの位置は,死後の内臓内臓の検証のためにマークされました.
主要な成果:
- 活性化 (アニソトロピー) の顕著な方向差は,端の頂部領域 (1.1+/- 0.4 m/s 平行 vs. 0.5+/- 0.2 m/s 軸に垂直) で観察されました.
- 導電速度は,ペクチナート筋肉領域内の両方向に類似していました.
- 終端の頂点に平行する導導管ブロックは,S(3) の刺激中に,犬の40%で誘導可能であった.
結論:
- 誘導性インターカバルブロックは,正常な心臓でも一般的です.
- アニゾトロプ的伝導と耐火性グラデーションは,終端の頂上のブロックを完全に説明することはできません.
- 末端のクライスト/ペクチナート筋肉の接点の解剖学的および電気生理学的特性は,おそらく,インターカバル伝導ブロックの基礎となっている.
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