長期発血性心筋症候群における心室性短心症の基礎となる焦点メカニズム
1Department of Internal Medicine, Washington University School of Medicine, St Louis, Mo 63110.
Circulation
|September 1, 1994
まとめ
心不全における心房不律は,マクロエントリーではなく,焦点メカニズムから発生します. 缺血性心筋症の治療法は,これらの焦点的起源を標的とし,不律を予防する必要があります.
科学分野:
- 心臓病学 心臓病学
- 心臓電気生理学 心臓電気生理学
- 心不全に関する研究
背景:
- 静脈動脈不調は,心不全における重大な懸念事項である.
- これらの心律乱のメカニズムを理解することは,効果的な治療に不可欠です.
研究 の 目的:
- 心不全モデルにおける自発的に発生する心室不律症の根本的なメカニズムを定義する.
- アリトモゲネシスにおける焦点活性化とマクロエントリーの役割を調査する.
主な方法:
- 複数の冠動脈内栓塞を介して犬の血動性心筋症の誘導.
- 自発的な心律失調の際に内壁部位の3次元心臓マッピング.
- ホルターモニタリングで心拍不全の負担を評価する.
- 線維症のための心臓組織の解剖学的分析.
主要な成果:
- 缺血性心筋症モデルでは,頻繁に早発性心室複合体 (PVCs) と心室低血圧 (VT) が発症しました.
- 3次元のマッピングにより,焦点メカニズムによって開始され,維持される不律が明らかにされました. 主に下腸内臓です.
- ノントランスムラル線維症は,焦点開始部位と相関し,トランスムラル線維症は伝導の遅延を引き起こした.
結論:
- この缺血性心筋症のモデルにおける自発性心房不律症は,マクロエントリーではなく,焦点メカニズムによって引き起こされる.
- 心不全における心室不律症の治療戦略は,焦点発症部位をターゲットにすべきである.
さらに関連する動画
10:08Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine
Published on: February 17, 2018
06:57Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
Published on: January 31, 2019
関連する概念動画
Electrophysiology of Normal Cardiac Rhythm
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
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.
Pathophysiology of Cardiac Performance
Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Myocarditis I: Introduction
Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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.
Cardiomyopathy III: Hypertrophic Cardiomyopathy
Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
