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相关概念视频

Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

945
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...
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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
1.3K
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

917
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.
917
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

3.7K
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...
3.7K
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

830
Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...
830
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

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相关实验视频

Updated: Jun 27, 2025

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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电风暴/耐火性心室动脉短心

Ashley R Tarchione1, Amrita Vempati2

  • 1Kaiser Permanente San Diego Medical Center, Department of Emergency Medicine, San Diego, CA.

Journal of education & teaching in emergency medicine
|May 6, 2024
PubMed
概括

这种模拟有效地训练了急诊医疗人员,使用高级心脏生命支持 (ACLS) 协议来管理心脏电风暴和耐火性心室性心力衰竭. 参与者发现现实案例改善了医疗知识和患者护理技能.

科学领域:

  • 医疗教育 医学教育
  • 心脏病学 心脏病学
  • 紧急医疗 紧急医疗

背景情况:

  • 心脏电风暴 (ES) 被定义为在24小时内≥3次持续的腹腔动脉高心率/或≥3次除器冲击.
  • 脑脊髓炎影响着多达40%的植入式除器患者,并且可能发生在有结构性心脏病,心肌梗塞或电解质障碍的患者中.
  • 耐火性心室失常会增加死亡风险,原因是细胞内失调升级,心肌损伤和catecholamine释放.

研究的目的:

  • 评估一个高保真模拟案例,用于应急医疗的住院医生在管理心脏电风暴.
  • 增强学习者识别和管理不稳定和耐火性心室高动脉的能力.
  • 提高决策技能,应用高级心脏生命支持 (ACLS) 算法和解释复杂的心电图.

主要方法:

  • 高准确度模拟,然后立即进行汇报.
  • 案例涉及在患有ST升高心肌梗塞 (STEMI) 的患者中管理耐火性心室低心率.
  • 学习者 (医学学生,PGY-1-3居民) 通过Zoom参与或观察;模拟后调查评估了案件的可信性,复杂性和教育价值.

主要成果:

  • 百分之百的受访参与者同意该案是可信的,并改善了医学知识/患者护理.
  • 92%的人认为案件的复杂性正确,92%的人报告了真实生活经历.

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Tissue Preparation Techniques for Contrast-Enhanced Micro Computed Tomography Imaging of Large Mammalian Cardiac Models with Chronic Disease
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A Model of Long-Term Ventricular Fibrillation in Isolated Rat Hearts
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A Model of Long-Term Ventricular Fibrillation in Isolated Rat Hearts

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Last Updated: Jun 27, 2025

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

Published on: January 31, 2019

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Tissue Preparation Techniques for Contrast-Enhanced Micro Computed Tomography Imaging of Large Mammalian Cardiac Models with Chronic Disease
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Tissue Preparation Techniques for Contrast-Enhanced Micro Computed Tomography Imaging of Large Mammalian Cardiac Models with Chronic Disease

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A Model of Long-Term Ventricular Fibrillation in Isolated Rat Hearts
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A Model of Long-Term Ventricular Fibrillation in Isolated Rat Hearts

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  • 所有参与者都同意,汇报会增强了他们的知识.

    • 结论:

    • 高准确度模拟对于教育住院人员关于腹腔动脉高心率和管理是有效的.
    • 学习者提高了应用ACLS算法的技能,管理耐火性心律失常症,并与家人沟通有关复苏愿望的技能.
    • 模拟为复杂的心脏紧急情况提供了有价值的,现实的学习体验.