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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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Mitral Valve Prolapse I: Introduction01:27

Mitral Valve Prolapse I: Introduction

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IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...
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Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

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Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
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Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

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Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
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Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

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Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Related Experiment Video

Updated: Oct 1, 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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Multifaceted Left Bundle Branch Block: What Are the Mechanisms?

Alexandre Raymond-Paquin1,2, Kenneth A Ellenbogen1, Santosh K Padala1

  • 1Division of Cardiology, Pauley Heart Center, Virginia Commonwealth University, Richmond, Virginia, USA.

JACC. Case Reports
|March 8, 2022
PubMed
Summary
This summary is machine-generated.

This study reviews four distinct electrophysiologic mechanisms of aberrant conduction: phase 3 block, acceleration-dependent block, phase 4 block, and concealed transseptal conduction. Understanding these is key for evaluating cardiac pacing needs.

Keywords:
ECG, electrocardiogramLBB, left bundle branchLBBB, left bundle branch blockRBB, right bundle branchRMP, resting membrane potentialaberrant conductioncardiomyopathyintraventricular conduction delayleft bundle branch block

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Related Experiment Videos

Last Updated: Oct 1, 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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Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Conduction

Background:

  • Aberrant conduction necessitates careful evaluation for appropriate cardiac pacing.
  • Four primary electrophysiologic mechanisms underlie aberrant conduction.

Purpose of the Study:

  • To elucidate the four distinct electrophysiologic mechanisms of aberrant conduction.
  • To present a case study allowing review of all aberrant conduction mechanisms in a single patient.

Main Methods:

  • Case report detailing electrophysiologic findings.
  • Review of aberrant conduction mechanisms including phase 3 block, acceleration-dependent block, phase 4 block, and concealed transseptal conduction.

Main Results:

  • Identification and differentiation of four unique aberrant conduction mechanisms.
  • Demonstration of all four mechanisms within a single patient's cardiac electrophysiology.

Conclusions:

  • Comprehensive understanding of aberrant conduction mechanisms is crucial for clinical decision-making.
  • This case highlights the diverse electrophysiologic pathways leading to aberrant conduction.