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Related Concept Videos

Dysrhythmias V: Evaluating Dysrhythmias01:30

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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...
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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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Dysrhythmias I: Introduction01:15

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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...
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Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
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Dysrhythmias VI: Management of Dysrhythmias01:25

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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...
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Pulse rhythm01:30

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Related Experiment Video

Updated: Aug 30, 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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Electrical dyssynchrony mapping and cardiac resynchronization therapy.

Alan J Bank1, Christopher D Brown2, Kevin V Burns2

  • 1Minneapolis Heart Institute East, Allina Health, St. Paul, MN, USA; Cardiology Division, Department of Medicine, University of Minnesota, Minneapolis, MN, USA; Heart Rhythm Science Center, Minneapolis Heart Institute Foundation, Minneapolis, MN, USA.

Journal of Electrocardiology
|September 2, 2022
PubMed
Summary
This summary is machine-generated.

A new method maps cardiac electrical dyssynchrony using wavefront fusion, improving cardiac resynchronization therapy (CRT) device optimization. This approach quantifies synchrony across various delays, enhancing patient outcomes.

Keywords:
Cardiac resynchronization therapyElectrical dyssynchronyElectrocardiographyOptimizationWavefront fusion

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Current clinical methods lack the ability to quantify or display electrical dyssynchrony across a broad spectrum of atrial-ventricular delays (AVD) and ventricular-ventricular delays (VVD) in patients undergoing cardiac resynchronization therapy (CRT).
  • Optimizing CRT device settings is crucial for improving patient outcomes, but this is often limited by the lack of comprehensive electrical synchrony assessment tools.

Purpose of the Study:

  • To develop and validate a novel methodology for mapping and quantifying electrical dyssynchrony in CRT patients.
  • To create a visual representation of electrical synchrony across a wide range of AVD and VVD settings using wavefront fusion.

Main Methods:

  • A cardiac resynchronization index (CRI) was measured in 90 patients across multiple device settings.
  • Electrical dyssynchrony maps (EDMs) were constructed to visualize CRI variations with different AVD and VVD combinations.
  • Wavefront fusion analysis, including right ventricular paced (RVp), left ventricular paced (LVp), and native wavefront offsets, was performed.

Main Results:

  • The study demonstrated a significant increase in CRI from baseline (58.0 ± 28.1%) to optimized settings (98.3 ± 1.7%).
  • Electrical dyssynchrony maps revealed distinct patterns for patients with high-grade heart block and those with intact AV node conduction.
  • Optimal synchrony lines (OSLs) showed specific shifts and configurations based on patient characteristics and pacing strategies, indicating effective CRT optimization.

Conclusions:

  • A new, noninvasive methodology for quantifying and graphing electrical dyssynchrony over a physiologic range of AVDs and VVDs has been successfully developed.
  • This wavefront fusion-based approach provides a practical clinical tool for assessing electrical synchrony.
  • The methodology holds potential for optimizing CRT device settings, thereby improving therapeutic efficacy in patients with cardiac dyssynchrony.