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関連する概念動画

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

664
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...
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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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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...
6.9K
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

3.3K
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...
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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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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...
1.6K
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

415
Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
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関連する実験動画

Updated: Feb 26, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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左脚ブロックの生理的ペーシングによる矯正：心電図を用いた患者内比較研究

Catalin Pestrea1, Ecaterina Cicala1, Sever Risca1

  • 1Department of Interventional Cardiology, Brasov County Clinical Emergency Hospital, Brasov, Romania.

Pacing and clinical electrophysiology : PACE
|February 24, 2026
PubMed
まとめ

His束ペーシング（HBP）と左脚区域ペーシング（LBBAP）は、左脚ブロック患者において同様の心電図的改善を提供する。両ペーシング法は、脱分極および再分極異常を効果的に減少し、心臓再同期療法を補助する。

キーワード:
His束ペーシング脱分極パラメータ左脚区域ペーシング左脚ブロック再分極パラメータ

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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
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関連する実験動画

Last Updated: Feb 26, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
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科学分野:

  • 循環器病学
  • 電気生理学
  • 心臓ペーシング

背景:

  • 左脚ブロック（LBBB）および左室駆出率低下（LVEF）は、しばしば心臓再同期療法（CRT）を必要とする。
  • His束ペーシング（HBP）および左脚区域ペーシング（LBBAP）は、心臓の脱分極および再分極に様々な影響を与える新しいCRT技術である。
  • 同じLBBB患者におけるHBPとLBBAPの procedurally における心電図変化の直接比較は限られている。

主な方法:

  • CRTのために成功裏にLBBAPを受けた36人の患者のレトロスペクティブレビューで、矯正型HBPの実現可能性が実証された。
  • 両ペーシング法について、QRS幅（QRSd）、QRSおよびT波軸、左室駆出時間（LVAT）、補正QT（QTc）およびJT（JTc）間隔、QT分散（QTd）、補正T波ピークから末端までの間隔（Tpec）を測定した。

結論:

  • LBBBおよびCRTの適応を有する患者において、HBPとLBBAPはどちらも心電図の脱分極および再分極パラメータにおいて、同等かつ有意な改善をもたらした。
  • LBBAPはHBPと比較してLVATが速くなる傾向を示した。
  • HBPとLBBAPの選択は、特定の患者因子およびCRT最適化のための手技目標によって異なる可能性がある。