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短いサイクルと長いサイクルにおけるヒトの心室運動ポテンシャルの持続時間. イシュケミアによる急速な調節
P Taggart1, P M Sutton, M R Boyett
1Department of Cardiology, Middlesex Hospital, London, UK.
Circulation
|November 15, 1996
まとめ
動脈不全は,人間の内心臓の電気還元曲線を平坦化し,早発の鼓動や一時停止が心室不律をどのように引き起こすかを説明する可能性がある. この研究では,冠動脈閉塞中の電気回復を調査しました.
科学分野:
- 心臓病学 心臓病学
- 電気生理学 電気生理学
- 心臓発作に関する研究
背景:
- 缺血中の心房不律症のメカニズムは完全に理解されていません.
- 行動ポテンシャル持続時間と心循環の長さの関係である電気還元が重要な役割を果たす可能性があります.
研究 の 目的:
- ヒトの心室内の電気回復に対するイシュケミアの影響を調査する.
- 電気還元の変化と,イシュケミア中の心拍動不全との関連を調査する.
主な方法:
- 冠動脈閉塞 (LADまたはRCA) を受けた患者の右心室隔膜からの記録された単相行動ポテンシャル (MAP)
- テストパルスシーケンスを使用して,サイクル長さの変更により,アクションポテンシャル持続時間 (APD) の変化を評価しました.
- 左前垂動冠動脈 (LAD) 閉塞 (不血症) と右冠動脈 (RCA) 閉塞 (コントロール) の間のMAPを比較した.
主要な成果:
- LAD閉塞は,基本拍数APD (260〜236 ms) を著しく短縮し,APD/透動間隔回復の傾きを平らにした.
- RCA閉塞 (制御) は,基本ビートAPDや還元斜率を大幅に変化させなかった.
- LAD閉塞によって誘発されたイシェミアは,正常なAPD/透析間隔の関係を最小限に抑えたり,廃止したり,逆転させたりした.
結論:
- 筋心臓のイシュケミアは,人間の内心臓の電気還元曲線を平坦化します.
- 缺血中の電気還元の変化は,心室動脈不律の開始に寄与する可能性があります.
- 発見は,イシュケミア誘発のプロアリズム症のメカニズムを示唆しています.
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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...
01:27Specialized Characteristics of Cardiac Muscles
The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy reserves in...
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy reserves in...
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...
01:29Cardiac Cycle
The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
During the cardiac cycle, blood flow through the heart is regulated entirely by changing pressure gradients. This sequence of events begins with the heart in a state of total relaxation, known as mid-to-late diastole, during which blood passively flows from...
During the cardiac cycle, blood flow through the heart is regulated entirely by changing pressure gradients. This sequence of events begins with the heart in a state of total relaxation, known as mid-to-late diastole, during which blood passively flows from...
01:25Correlation between ECG and Cardiac Cycle
The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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