相关实验视频
Updated: Jul 18, 2026

09:45
An Isolated Working Heart System for Large Animal Models
Published on: June 11, 2014
在人类心脏中,腹腔动脉低心率背后的复入和焦点机制
S M Pogwizd1, R H Hoyt, J E Saffitz
1Cardiovascular Division, Washington University School of Medicine, St. Louis, MO 63110.
Circulation
|December 1, 1992
概括
患有心肌梗塞的患者腹腔动脉短心 (VT) 的机制包括室内重新进入和焦点触发器. 这项研究使用3D绘图来识别耐火性静脉瘤的这些潜在原因.
科学领域:
- 心脏病学 心脏病学
- 电子生理学 电子生理学
- 心脏解剖学 心脏解剖学
背景情况:
- 在已治愈心肌梗塞的患者中,阻断性心室动脉冲动 (VT) 呈现出重大临床挑战.
- 了解VT的精确机制对于开发有效的治疗策略至关重要.
研究的目的:
- 阐明先前心肌梗塞患者持续性腹腔动心 (VT) 的潜在机制.
- 用详细的电生理学绘图来区分重新进入者和焦点VT起源.
主要方法:
- 在13名患有已治愈心肌梗塞和耐火静脉瘤的患者中进行了手术期间的三维电解剖绘图.
- 绘制地图包括对多达156个室内站点进行详细分析,以确定VT电路.
- 组织病理学分析与映射数据相关,以确定痕组织和导电异常.
主要成果:
- 分析了8名患者的10次持续性静脉动脉,揭示了两个主要机制:内腔再进入和焦点启动.
- 内腔再进入,通常涉及心下或心上回路,具有显著的导电延迟和阻塞,占VTs的一半.
- 另一半的VTs源自一个焦点机制,其特点是节拍之间没有电活动,尽管内部记录.
结论:
- 在治愈心肌梗塞的背景下,内腔重新进入和焦点机制都对持续的腹腔心动减速有显著的贡献.
- 导电异常,受到心脏病发作位置和相邻纤维组织的影响,在巨型静脉瘤中起着关键作用.
- 了解这些独特的机制对于指导切除策略和改善患者治疗结果至关重要.
相关概念视频
Anatomy of the Heart
The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
Overview of the Heart
The heart, a muscular organ located in the chest, functions as the body's pump, circulating blood through the vascular system. It has four chambers: two atria on top and two ventricles below. The right atrium receives deoxygenated blood from the body and passes it to the right ventricle, which pumps it to the lungs for oxygenation. The left atrium receives oxygenated blood from the lungs and transfers it to the left ventricle, which pumps it to the rest of the body.
The heart's structure...
The heart's structure...
Heart Valves
The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
Conduction System of the Heart
Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
Anatomy of the Heart
The heart is a hollow, muscular organ approximately the size of a fist, consisting of four chambers. It is enclosed in the pericardium, a fibrous sac with two layers: the visceral and parietal pericardium, separated by a fluid-filled space containing serous fluid to reduce friction.
The heart has three layers: the innermost endocardium, the muscular myocardium, and the outer epicardium, all working together for optimal cardiac function.
Chambers of the Heart
The heart is made up of four...
The heart has three layers: the innermost endocardium, the muscular myocardium, and the outer epicardium, all working together for optimal cardiac function.
Chambers of the Heart
The heart is made up of four...
Conduction System of the Heart
The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
This system relies on the unique properties of nodal and Purkinje cells:...

