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相关概念视频

Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

705
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...
705
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

150
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
150
Increased pulse rate01:17

Increased pulse rate

621
Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
621
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

849
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.
849
The Cardiac Cycle01:13

The Cardiac Cycle

80.1K
The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
80.1K
Cardiac Action Potential01:30

Cardiac Action Potential

567
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.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
567

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相关实验视频

Updated: May 9, 2025

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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缩小的右捆分支区块模式在心动节拍.

Zhi Luo1, Yi Liu2, Yuwei Chen2

  • 1Department of Cardiovascular Medicine, The People's Hospital of Jianyang City, Jianyang, China.

Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
|April 29, 2025
PubMed
概括
此摘要是机器生成的。

这个案例研究突出了沃尔夫-帕金森-怀特 (WPW) 综合征的诊断. 在鼻腔节律和心跳期间比较心电图 (ECG) 对于识别正向心房回入性心力衰竭 (AVRT) 至关重要.

科学领域:

  • 心脏病学 心脏病学
  • 电子生理学 电子生理学
  • 医学诊断 医学诊断 医学诊断

背景情况:

  • 沃尔夫 - 帕金森 - 怀特综合征 (WPW) 是一种前兴奋综合征,可以导致脑上脉高心率.
  • 准确诊断WPW综合征和相关心律失常对于有效的患者管理至关重要.
关键词:
沃尔夫 - 帕金森 - 白色电心电图 (ECG) 是一种心电图.鼓动,心跳的发生.右捆的分支区块分支区块.

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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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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Last Updated: May 9, 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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Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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