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Related Concept Videos

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...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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...
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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: Jun 10, 2026

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
28:13

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation

Published on: February 26, 2013

[Ablation devices in arrhythmia surgery].

Yosuke Ishii1, T Nitta

  • 1Department of Cardiothoracic Surgery, Nippon Medical School, Chiba Hokusoh Hospital, Chiba, Japan.

Kyobu Geka. the Japanese Journal of Thoracic Surgery
|August 19, 2010
PubMed
Summary
This summary is machine-generated.

Surgical arrhythmia ablation aims to create conduction blocks. While "cut-and-sew" is effective, alternative devices may not ensure complete transmural lesions, risking incomplete block and reentrant circuit propagation.

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Robotic Ablation of Atrial Fibrillation
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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

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Last Updated: Jun 10, 2026

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
28:13

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation

Published on: February 26, 2013

Robotic Ablation of Atrial Fibrillation
11:21

Robotic Ablation of Atrial Fibrillation

Published on: May 29, 2015

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

Area of Science:

  • Cardiac Surgery
  • Electrophysiology
  • Biomedical Engineering

Context:

  • Arrhythmia surgery relies on creating conduction blocks to interrupt abnormal electrical pathways.
  • The traditional "cut-and-sew" technique effectively achieves transmural conduction block.
  • Minimally invasive ablation devices aim to simplify procedures and reduce risks compared to open-chest surgery.

Purpose:

  • To evaluate the efficacy of alternative ablation devices in creating transmural lesions for arrhythmia surgery.
  • To compare the effectiveness of various ablation technologies against the established "cut-and-sew" method.
  • To highlight the importance of achieving complete conduction block in preventing arrhythmia recurrence.

Summary:

  • The
  • cut-and-sew
  • surgical technique creates a reliable conduction block, preventing abnormal atrial activation and reentrant circuits.
  • Alternative ablation devices (cryoablation, radiofrequency, microwave, ultrasound) are being developed to simplify surgery but may not consistently achieve transmural and continuous necrosis.
  • Incomplete lesions can allow atrial activation to propagate, particularly if surviving myocardium reaches a critical level, necessitating surgeon expertise with each device.

Impact:

  • Incomplete transmural lesions from ablation devices can lead to persistent or recurrent arrhythmias.
  • Surgeons must understand the precise mechanisms of each ablation device to ensure complete lesion creation.
  • Optimizing ablation techniques is crucial for improving surgical outcomes in treating cardiac arrhythmias.