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相关概念视频

Cardiac Action Potential01:30

Cardiac Action Potential

1.3K
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
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Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

936
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...
936
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

911
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.
911
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

210
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,...
210
Electrocardiogram01:29

Electrocardiogram

2.3K
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
2.3K
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

3.3K
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...
3.3K

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相关实验视频

Updated: Jun 24, 2025

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

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运动诱导的1型布鲁加达在儿童中的模式.

Giovanni Domenico Ciriello1, Emanuele Romeo1, Diego Colonna1

  • 1Adult Congenital Heart Disease and Congenital and Familial Arrhythmias Unit, Monaldi Hospital, Naples, Italy.

Pacing and clinical electrophysiology : PACE
|June 9, 2024
PubMed
概括

运动压力测试可以揭示一些患者的布鲁加达综合征1型模式. 这个案例突出了儿童的运动诱导布鲁加达模式,建议进一步探索运动测试.

关键词:
布鲁加达综合征是什么孩子孩子孩子孩子孩子孩子电心电图 (ECG) 是一种心电图.炼压力测试 运动压力测试可植入的循环记录器

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Dual-Dye Optical Mapping of Hearts from RyR2R2474S Knock-In Mice of Catecholaminergic Polymorphic Ventricular Tachycardia
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Measuring Cardiac Autonomic Nervous System ANS Activity in Children
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相关实验视频

Last Updated: Jun 24, 2025

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Dual-Dye Optical Mapping of Hearts from RyR2R2474S Knock-In Mice of Catecholaminergic Polymorphic Ventricular Tachycardia
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Dual-Dye Optical Mapping of Hearts from RyR2R2474S Knock-In Mice of Catecholaminergic Polymorphic Ventricular Tachycardia

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Measuring Cardiac Autonomic Nervous System ANS Activity in Children
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科学领域:

  • 心脏病学 心脏病学
  • 儿科电子生理学 儿科电子生理学

背景情况:

  • 布鲁加达综合征是一种影响心律的遗传性疾病.
  • 运动压力测试可以揭露一些人的1型布鲁加达模式.

研究的目的:

  • 报告一例儿童患者的运动诱导型1布鲁加达模式.
  • 讨论儿童布鲁加达综合征运动压力测试的诊断效用和风险分层潜力.

主要方法:

  • 一个有心的12岁孩子的案例介绍.
  • 运动压力测试的执行.
  • 对布鲁加达综合征和儿童运动测试现有文献的综述.

主要成果:

  • 运动压力测试成功揭露了小儿病患者的1型布鲁加达模式.
  • 患者在测试期间出现心,与心电图变化相关.

结论:

  • 运动压力测试可以成为诊断儿科患者布鲁加达综合征的宝贵工具.
  • 需要进一步的研究来确定运动压力测试在这个人群的风险分层中的作用.