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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

1.6K
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...
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Electrocardiogram01:29

Electrocardiogram

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An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
6.7K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

641
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...
641
Cardiac Action Potential01:30

Cardiac Action Potential

7.2K
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
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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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...
13.1K
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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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...
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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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明確な心内電図波形は,左束の枝領域のペースインプランテーションの際に穿孔を伴う.

Heli Tolppanen1,2, Valerian Valiton1, Samuel Stempfel1

  • 1Cardiac Pacing Unit, Department of Cardiology, University Hospital of Geneva, rue Gabrielle Perret Gentil 4, Geneva 1211, Switzerland.

Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology
|February 17, 2026
PubMed
まとめ

左バンドルブランチエリアペース (LBBAP) 穿孔は,損傷の電流 (COI) の振幅の低下を引き起こします. 単極電図 (iEGM) の波形を分析することで,LBBAPのリード展開中に穿孔を特定し,患者の安全性を向上させることができます.

キーワード:
合併症 合併症について導電システムのペースを調整する.傷害の現状についてエレクトログラム エレクトログラム左のバンドル 支部エリア パッシング穿孔による穿孔です.

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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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科学分野:

  • 心臓病学 心臓病学
  • 電気生理学 電気生理学
  • 医療機器 医療機器について

背景:

  • LEFT BUNDLE BRANCH AREA PECAMING (LBBAP) は,ペーシングの高度なテクニックである.左バンドルブランチエリアペーシング (LBBAP) は,ペーシングの高度なテクニックである.
  • LBBAP鉛インプラントの穿孔は合併症を引き起こす可能性があります.
  • 単極電図 (iEGM) は,リードの配置中に信号を提供します.

研究 の 目的:

  • LBBAP穿孔中の単極iEGM波形を体系的に分析する.
  • これらの波形を,最終リードポジションで記録された波形と比較するために.
  • 穿孔を示す特定の波形特性を特定するために.

主な方法:

  • LBBAPの穿孔を持つ92人の患者からの単極iEGMの分析.
  • 穿孔時の損傷電流 (COI) の振幅と波形形態の比較と最終リード位置の比較.
  • QRS形態学 (狭い/LBBB以外の対 LBBB/ペースリズム) と穿孔型 (マクロ対マイクロ) に基づいたサブグループ分析.

主要な成果:

  • 感知されたCOI振幅は,最終リード位置 (14.0 mV) と比較して,穿孔 (3.0 mV) 時に有意に低かった.
  • 狭いQRS/非LBBBを持つ患者はQS波形 (67%) を示し,LBBB/ペースリズムを持つ患者はR/RS形態 (93%) を示した.
  • COI振幅よりも大きい感知QまたはS振幅は,狭いQRSサブグループで穿孔を診断するための86%の感度と93%の特異性を有しました.

結論:

  • 単極iEGM波形分析は,LBBAP穿孔のCOI振幅を超える追加の診断情報を提供します.
  • 特定の波形形状形態 (例えば,狭いQRSでQS) は,穿孔を確実に示すことができます.
  • 鉛の配備中にiEGM波形の注意深い監視は,LBBAPの安全性を高めます.