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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
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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.
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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...
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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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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.
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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...
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Related Experiment Video

Updated: Oct 17, 2025

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Left bundle branch area pacing: Electrocardiographic features.

Asit Das1, Suman Chatterjeet Das1, Aniruddha Mandal1

  • 1Department of Cardiology IPGME&R and SSKM Hospital Kolkata India.

Journal of Arrhythmia
|October 8, 2021
PubMed
Summary
This summary is machine-generated.

Left bundle branch (LBB) area pacing offers narrower QRS duration compared to RV apical pacing. ECG patterns in lead V1 are typically qR or Qr, with greater QRS shortening in patients with baseline LBBB.

Keywords:
His bundleleft bundle branch areaphysiological pacing

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Left bundle branch (LBB) area pacing is an emerging alternative for physiological pacing and cardiac resynchronization therapy.
  • Understanding the electrocardiogram (ECG) features of LBB area pacing is crucial for various patient subsets.

Purpose of the Study:

  • To identify distinct morphological patterns and characteristic ECG features associated with LBB area pacing.
  • To compare ECG findings of LBB area pacing with conventional RV apical pacing.

Main Methods:

  • Utilized a Medtronic 3830 pacing lead to access the LBB area via the interventricular septum.
  • Observed paced QRS morphology in lead V1 and paced QRS duration in 60 patients undergoing LBB area pacing.
  • Compared findings with 60 patients who received RV apical pacing.

Main Results:

  • LBB area pacing resulted in a narrower-paced QRS complex compared to RV apical pacing.
  • Patients with baseline Left Bundle Branch Block (LBBB) experienced greater QRS shortening (34.45 ± 8.07 ms) than those with Right Bundle Branch Block (RBBB) (19.78 ± 10.24 ms).
  • The most common paced QRS morphology in lead V1 was a qR pattern, followed by a Qr pattern.

Conclusions:

  • LBB area pacing yields a narrower QRS duration than RV apical pacing.
  • The predominant paced QRS morphology in lead V1 is qR or Qr.
  • Baseline LBBB patients demonstrate more significant QRS shortening with LBB area pacing compared to baseline RBBB patients.