彼の電図の交代は,心房細動中の二重心房節経路伝導を明らかにします: ゆっくり経路改変の役割
Youhua Zhang1, Saroja Bharati, Kent A Mowrey
1Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.
Circulation
|February 26, 2003
まとめ
彼のエレクトログラム (HE) の代替は,心房細動 (AF) の二重経路を視覚化しています. この方法は,ゆっくりとした経路の修正を誘導し,心室速度を減速させ,AF中に高速経路の優位性を確認しました.
科学分野:
- 心血管電気生理学 心血管電気生理学
- アトリオベントリキュラー・ノダル・コンダクション
- 心律不整症とは,心律不整症のこと.
背景:
- 伝統的な電気生理学的ツールは,永久性心房動 (AF) 中の二重経路心房節 (AVN) 伝導を研究するのに限られています.
- AFにおける高速経路 (FP) と遅い経路 (SP) の波線の行動と変更は不明のままである.
- 以前の作業では,FPとSPの伝導をビートバイビートで区別するためのインデックスとして,His electrogram (HE) alternansを確立しました.
研究 の 目的:
- AF中に二重経路伝導を監視するためにHEアルターナーを適用する.
- AFにおけるAVN電気生理学に対するSP修正の影響を評価する.
- 治療的介入のガイドとして,HEの代替品の使用の可行性を調査する.
主な方法:
- 使用されたウサギのAVN製剤は,A(1) A(2) のペースと誘発AFを施した.
- デュアルパスウェイの活動を特定するために,記録されたHEのアルターナー.
- HEの代替によって導かれた選択的なSP改変を実行しました.
- ヒス・ヒスの間隔を測定し,介入後の形態学的分析を行った.
主要な成果:
- HEの代替剤は,AF中のウサギのAVN製剤12種のうち9種で二重経路の存在を確認した.
- HEの代替によって導かれたSPの修正は,SPを排除し,主にFP伝導を促進しました.
- この介入により,His-His間隔 (204±14 msから276±51 ms,P<0.001) が著しく増加した.
- 形態学的研究は,SPの修正が,後部AVN拡張のみに影響することを示しました.
結論:
- HE代替は,ダブルパス電気生理学の"視覚化"を可能にし,ウサギのAF中にFPとSPの波面を確認します.
- この新しい指数は,選択的なSP除去を容易にし,心室の速度を大幅に減速させた.
- HEの代替は,AVNの伝導メカニズムに関する新しい洞察を提供し,AFの速度制御のためのAVNの修正を導くことができます.
関連する概念動画
Electrophysiology of Normal Cardiac Rhythm
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
Mechanism of Cardiac Arrhythmias
Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
Conduction System of the Heart
Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
Conduction System of the Heart
The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
This system relies on the unique properties of nodal and Purkinje cells:...
Dysrhythmias IV: Characteristics of Bradyarrhythmias
Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...


