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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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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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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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Cardiac Catheterization III: Left Heart Catheterization01:24

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Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...
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Cardiac Catheterization II: Right Heart Catheterization01:21

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Right Heart Catheterization: An OverviewRight heart catheterization is an invasive diagnostic procedure that measures right-sided cardiac and pulmonary artery pressures, calculates cardiac output, and identifies intracardiac shunts. It provides detailed hemodynamic data essential for diagnosing and managing various cardiovascular conditions, such as pulmonary hypertension.Access SitesCommon access sites for right heart catheterization include the internal jugular vein in the neck region, the...
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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Mitral Stenosis III: Medical Management01:26

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Mitral stenosis, a condition marked by the narrowing of the mitral valve, necessitates an integrated approach for effective management. This approach includes preventative measures, medical therapy, and surgical interventions to reduce symptoms and prevent complications.PreventionPrevention of mitral stenosis primarily focuses on reducing the incidence of bacterial infections, particularly streptococcal infections, which can lead to rheumatic fever and subsequent valvular damage. Timely...
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Related Experiment Video

Updated: Dec 22, 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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[Indications for His bundle and left bundle branch pacing].

Carsten W Israel1, Sona Tribunyan2, Sergio Richter3

  • 1Klinik für Innere Medizin - Kardiologie, Diabetologie & Nephrologie, Evangelisches Klinikum Bethel, Burgsteig 13, 33617, Bielefeld, Deutschland. Carsten.Israel@evkb.de.

Herzschrittmachertherapie & Elektrophysiologie
|May 10, 2020
PubMed
Summary
This summary is machine-generated.

His bundle pacing (HBP) offers improved cardiac synchronicity over traditional methods and is effective in over 90% of patients. This pacing technique is a viable alternative for various heart conditions, including atrioventricular block.

Keywords:
Ablate and paceAlternative pacing sitesCardiac conduction systemCardiac pacingCardiac resynchronization

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • His bundle pacing (HBP) utilizes the natural cardiac conduction system for ventricular excitation, promoting better contraction synchronicity and efficacy compared to myocardial pacing.
  • Advancements in implantation tools and techniques have made HBP a highly successful procedure, achievable in over 90% of patients with comparable lead stability and threshold increase rates to conventional systems.

Purpose of the Study:

  • To evaluate His bundle pacing (HBP) as an alternative to conventional pacing methods.
  • To identify specific clinical conditions where HBP is indicated.
  • To introduce Left Bundle Branch Pacing (LBBP) as a potential solution for limitations associated with HBP.

Main Methods:

  • Review of existing data and clinical experience with His bundle pacing (HBP).
  • Comparison of HBP outcomes with conventional right or biventricular pacing.
  • Introduction and preliminary description of Left Bundle Branch Pacing (LBBP) technique.

Main Results:

  • HBP is a successful alternative for high-degree atrioventricular (AV) block, AV block with prolonged PQ intervals, AV node ablation for atrial fibrillation, and pacing-induced cardiomyopathy.
  • HBP may also be beneficial in cardiac resynchronization therapy (CRT).
  • Left bundle branch block (LBBB) is a limitation for HBP, leading to the development of LBBP.

Conclusions:

  • His bundle pacing (HBP) is an effective and broadly applicable pacing strategy for specific cardiac conditions.
  • Left bundle branch pacing (LBBP) is an emerging technique to address LBBB, though long-term data is limited.