伝導障害や交差点リズムにおけるヒス・プルキンジェの活動に関するエクストラカルディアック記録
Circulation
|May 1, 1975
まとめ
エピカルディアル平均リード (EAL) は,ヒス・プルキンジェ系 (HPS) の電気活動を効果的に検出します. この技術は,HPSの伝導欠陥を特定し,心律不整の診断に役立ちます.
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:
- 表面記録は,P-Rセグメント中の電気活動を検出することができ,おそらくHis-Purkinjeシステム (HPS) から発生しています.
- これらの記録のHPS伝導欠陥に対する感受性を評価することは,心臓の電気伝播を理解するために重要である.
研究 の 目的:
- ヒス・パーキンジェ系 (HPS) アクティベーションの変化に対する表心臓平均鉛 (EAL) 記録の感度評価.
- EALの発見と実験的に誘発された心臓伝導障害を相関させるため.
主な方法:
- 胸切除手術を受けた15匹の犬の双極性線索を用いた直結性表心記録.
- 信号の増幅,フィルタリング,および信号の強化のためのデジタルコンピュータ平均.
- 試行錯誤により,心房内閉節ブロック,心内閉節ブロック,閉節分岐ブロック,および交差点リズムを誘導した.
主要な成果:
- EALでは,HPSの脱極化が検出され,His bundle electrograms (HBE) と相関しています.
- 特定のEALの変化は,心房小節節ブロック,内ヒスバンドルブロック,右バンドルブランクブロック,およびディスタルヒスバンドル遅延で観察されました.
- EALは,正常な伝導時に再現可能なHPS活動と,伝導異常時に一貫した変化を示した.
結論:
- エピカルディアの平均導線は,ヒス・プルキンジェ系伝導の変化に敏感である.
- この技術は,HPS機能を非侵襲的に評価し,伝導障害を診断するための貴重なツールを提供します.
関連する概念動画
01:13The Cardiac Cycle
The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and empty blood into the...
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and empty blood into the...
01:30Pulse rhythm
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
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
01:28Electrocardiogram Fundamentals
Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...