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Related Concept Videos

Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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...
Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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.
Dysrhythmias VII: Nursing Management of Dysrhythmias01:25

Dysrhythmias VII: Nursing Management of Dysrhythmias

Nursing management of dysrhythmias involves the following:AssessmentSubjective Assessment:The initial step involves gathering patient-reported symptoms such as dizziness, palpitations, and chest discomfort. It is crucial to collect a detailed history, including previous heart conditions, current medication use, and lifestyle factors like caffeine and alcohol consumption.Objective Assessment:This involves observing clinical signs such as jugular venous distention, cool and pale skin, and...

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Related Experiment Video

Updated: May 25, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

Published on: December 11, 2017

Electrical remodeling in dyssynchrony and resynchronization.

Takeshi Aiba1, Gordon Tomaselli

  • 1Division of Arrhythmia and Electrophysiology, Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, 5-7-1 Fujishiro-dai, Suita, Osaka, Japan 565-8565. aiba@hsp.ncvc.go.jp

Journal of Cardiovascular Translational Research
|January 25, 2012
PubMed
Summary
This summary is machine-generated.

Cardiac resynchronization therapy (CRT) partially restores electrical function in heart failure (HF) with dyssynchronous left ventricular (LV) contraction. This improves calcium handling and reduces arrhythmias, contributing to CRT

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Remodeling

Background:

  • Heart failure (HF) causes significant cardiac remodeling, altering electrical activity and leading to arrhythmias.
  • Dyssynchronous left ventricular (LV) contraction in HF patients presents unique electrophysiological challenges.
  • The precise electrophysiological effects of Cardiac Resynchronization Therapy (CRT) in HF remain incompletely understood.

Purpose of the Study:

  • To investigate the molecular and cellular basis of electrical remodeling in dyssynchronous heart failure (DHF).
  • To elucidate the electrophysiological consequences of CRT in a canine model of DHF.
  • To understand how CRT restores cardiac function and reduces arrhythmia risk.

Main Methods:

  • Utilized a canine tachypacing model to induce HF and DHF.
  • Assessed ion channel function, calcium homeostasis, and β-adrenergic responsiveness.
  • Measured action potential duration (APD) and electrical conduction across LV regions.

Main Results:

  • CRT partially reversed downregulation of K+ currents and improved Na+ channel function.
  • CRT normalized Ca2+ homeostasis by reducing Ca2+/calmodulin-dependent protein kinase II activity and restoring T-tubule structure.
  • CRT abbreviated APD prolongation, reduced regional APD gradients, and suppressed early afterdepolarizations.

Conclusions:

  • CRT partially restores ion channel remodeling and calcium handling in DHF.
  • CRT mitigates regional electrical heterogeneity and blunted β-adrenergic response.
  • CRT may suppress ventricular arrhythmias and improve cardiac mechanical performance.