静脈動脈動脈不全時の二重ポテンシャルの特徴. 暫定的な引き寄せの間の研究
B Olshansky1, D Moreira, A L Waldo
1University Hospitals of Cleveland/Case Western Reserve University, Ohio.
Circulation
|February 1, 1993
まとめ
ヒトの心室性タヒカルディア中の二重ポテンシャルは,リエントラント回路内のブロックを示し,遅い伝導ではありません. 暫定的な誘導は,ブロックの領域を囲む明確な活性化波線を明らかにした.
科学分野:
- 心臓病学 心臓病学
- 電気生理学 電気生理学
- 心律不整症とは,心律不整症のこと.
背景:
- 動物モデルでの再発性タヒカルディアの際に二重ポテンシャルが観察されています.
- 人間の心室動脈性急性心臓発作 (VT) におけるその意義は不明である.
研究 の 目的:
- 人間のVT中に記録されたダブルポテンシャルの意味を明らかにするために,一時的なエントレインメントを使用して.
主な方法:
- 静脈動脈症の3人の患者で,一時的な引き寄せが使用されました.
- ダブルポテンシャル・デフレクションの分析と,パッシングサイクルの長さやQRS複合体との関連.
主要な成果:
- ダブルポテンシャルは,引き寄せの過程で捉えられ,短いと長いアクティベーションタイムが区別される.
- 短い間隔はより速いペースで短縮され,活発な脱極化を表していないことを示唆しています.
- 突然の形態の変化は,活性化方向の変化を示し,VT中断時に二重ポテンシャルが消失しました.
結論:
- VT中のダブルポテンシャルとは,再侵入回路内のブロックの領域を横断するアクティベーション波フロントを意味する.
- それらは回路の中央のブロックを表しており,遅い導電そのものではありません.
関連する概念動画
01:19Electrophysiology 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...
01:29Disturbances in Heart Rhythm
Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
01:30Cardiac Action Potential
Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
01:29Dysrhythmias III: Characteristics of Dysrhythmias
Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per minute.
01:18Dysrhythmias 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...
01:25ECG 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...