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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

3.8K
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...
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Cardiopulmonary Resuscitation III: AED Use01:23

Cardiopulmonary Resuscitation III: AED Use

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Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...
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Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

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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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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

691
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...
691
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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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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Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

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Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
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Updated: Mar 31, 2026

Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts
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Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts

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三相波形による心室除細動.

J Huang1, B H KenKnight, D L Rollins

  • 1Cardiac Rhythm Management Laboratory, Division of Cardiovascular Diseases, Department of Medicine, Department of Physiology, and Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA.

Circulation
|March 22, 2000
PubMed
まとめ
この要約は機械生成です。

三相除細動波形は,特に80%の傾きと特定の電極極性を持つ二相波形よりも効率的かもしれません. しかし,それらの優位性は,すべての構成とコンデンサのサイズに一貫しているわけではありません.

さらに関連する動画

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction

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A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
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A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation

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関連する実験動画

Last Updated: Mar 31, 2026

Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts
08:43

Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts

Published on: August 26, 2021

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Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
06:57

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction

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A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
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科学分野:

  • 心血管科学の研究について
  • バイオメディカルエンジニアリング
  • 電気生理学 電気生理学

背景:

  • 三相波形は,二相波形よりも少量の心筋損傷を引き起こすと仮定されています.
  • この研究では,三相対二相波形の除細動値 (DFTs) を調査しています.

研究 の 目的:

  • 三相波形と二相波形の除細動効率を比較する.
  • 波形の傾き,相持続,電極の極性によるDFTへの影響を評価する.

主な方法:

  • 豚の除細動の値は,静脈経由の鉛系を用いて測定した.
  • 三相波形と二相波形の両方が,異なる容量器サイズ (300マイクロFと140マイクロF) と傾きでテストされました.
  • 各波形について,DFTに対する電極極性 (アナード対正極) の影響を評価した.

主要な成果:

  • 80%の傾きと特定の電極極性を持つ三相波形は,300マイクロFの電容器を使用した二相波形と比較して,著しく低いDFTを示しました.
  • 別のグループでは,49%と56%の傾きを持つ三相波形は,同様の傾きを持つ二相波形よりもエネルギー要求が低いことを示したが,これはアナードフェーズ1でのみであった.
  • 電極の極性は,両方の実験グループで三相波形のためのDFTに大きく影響した.

結論:

  • 特定の三相波形 (例えば,80%の傾き) は,300マイクロFのコンデンサを搭載した二相波形よりも効率的に除細動することができる.
  • 三相波形は,140マイクロFの電容器からの二相波形よりも優れていることが判明しませんでした.
  • 三相除細動の有効性は,特定の相持続時間と電極の極性に依存しています.