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Related Concept Videos

Electrocardiogram Fundamentals01:28

Electrocardiogram 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...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias 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...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG 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...
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias 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.
Disturbances in Heart Rhythm01:29

Disturbances 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...
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology 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...

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Related Experiment Video

Updated: May 29, 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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Electrocardiographic Characteristics Associated With Lead Position Variations in Left Bundle Branch Area Pacing.

Naoki Matsumoto1, Kenji Shimeno1, Yumi Kashima1

  • 1Department of Cardiology, Osaka City General Hospital, Osaka, Japan.

Pacing and Clinical Electrophysiology : PACE
|May 28, 2026
PubMed
Summary

Left bundle branch area pacing (LBBAP) lead placement impacts electrocardiogram (ECG) findings. Low septal pacing is linked to specific ECG patterns, influencing the interpretation of left bundle branch capture.

Keywords:
V6–V1 interpeak intervalelectrocardiographylead positionleft bundle branch area pacingsV6RWPT

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Published on: January 31, 2019

Area of Science:

  • Electrophysiology
  • Cardiology
  • Medical Devices

Background:

  • Physiology-based electrocardiographic (ECG) criteria are standard for assessing left bundle branch area pacing (LBBAP).
  • The influence of specific lead implantation sites on ECG parameters in LBBAP is not well-defined.

Purpose of the Study:

  • To investigate how lead implantation site affects ECG parameters during LBBAP.
  • To evaluate ECG criteria for left bundle branch (LBB) capture based on lead position.

Main Methods:

  • Analysis of 212 patients with successful LBBAP, categorized into high septum (HS), mid septum (MS), and low septum (LS) groups.
  • Comparison of ECG parameters including QRS morphology in lead V1, stimulus-to-R-wave peak times (sV6RWPT, sV1RWPT), and V6-V1 interpeak interval.
  • Assessment of proportions meeting proposed ECG criteria for LBB capture.

Main Results:

  • The low septum (LS) group showed a higher prevalence of dominant R waves in V1 (qR morphology).
  • LS group exhibited shorter sV6RWPT compared to the mid septum (MS) group, and longer sV1RWPT and V6-V1 interpeak intervals.
  • The LS group more frequently met the V6-V1 interpeak interval criterion (>44 ms).

Conclusions:

  • Low septal lead placement in LBBAP is associated with distinct ECG findings, including specific QRS morphologies and timing intervals.
  • Implantation site is a critical factor influencing ECG interpretation for LBBAP, particularly for assessing LBB capture.