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相关概念视频

Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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 heart...
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage. When...
Dysrhythmias III: Characteristics of Dysrhythmias01:29

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.
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...

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相关实验视频

Updated: Jul 6, 2026

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
09:52

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts

Published on: November 7, 2019

超性心肌病中心室动与节奏右心室电图的分数增加有关.

R C Saumarez1, A J Camm, A Panagos

  • 1Department of Cardiological Sciences, St. George's Hospital Medical School, London, UK.

Circulation
|August 1, 1992
PubMed
概括

患有缩性心肌病症 (HCM) 的患者表现出增加的电导异常,特别是在那些有突然心脏死亡风险的人群中. 这些发现表明,导电分散与危险心律的发展之间存在联系.

更多相关视频

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
08:10

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation

Published on: July 20, 2022

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
10:17

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

相关实验视频

Last Updated: Jul 6, 2026

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
09:52

Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts

Published on: November 7, 2019

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
08:10

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation

Published on: July 20, 2022

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
10:17

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

科学领域:

  • 心脏病学 心脏病学
  • 电力生理学 电力生理学
  • 心脏电生理学 心脏电生理学

背景情况:

  • 超性心肌病 (HCM) 的特征是肌纤维细胞失调.
  • 假设这种混乱会导致整个心室肌动脉的电活化分散.

研究的目的:

  • 在患有HCM的患者中研究心室内导电.
  • 测试肌纤维细胞失调导致心室激活分散的假设.

主要方法:

  • 研究了37名HCM患者和4名对照人群,使用右心室 (RV) 节奏和电图记录.
  • 分析了S1S2合间隔减少期间的电图延迟和持续时间.
  • 利用高通过来强调小肌细胞束激活.

主要成果:

  • 与风险较低的患者和对照组相比,患有心室动 (VF),心室低心率 (VT) 或家族突发死亡史的患者表现出更长的电图持续时间.
  • 差别分析显著区分了VF患者和那些有突然死亡风险的人.
  • 电子图表的延迟变化在不同组之间有所不同,VF患者显示较早的延迟增加.

结论:

  • 患有急性死亡风险的HCM患者在心室内导电中表现出更大的分散和不均性.
  • 这种电气不均性可能会使个体易患复发性心律失常和心脏突发事件.