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相关概念视频

Electrocardiogram01:29

Electrocardiogram

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 the T...
Exercise Stress Test01:26

Exercise Stress Test

Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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...
Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
Physiological Foundation of Stress01:24

Physiological Foundation of Stress

Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
Role of the Sympathetic Nervous System
Adrenaline triggers the...

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相关实验视频

Updated: Jun 9, 2026

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
07:15

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Published on: January 16, 2019

运动压力测试在长QT综合征的LQT1和LQT2形式中放大了基因型-表型相关性.

Kotoe Takenaka1, Tomohiko Ai, Wataru Shimizu

  • 1Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan.

Circulation
|February 20, 2003
PubMed
概括

在LQT1患者的运动期间,Tpe间隔,心脏复极化的度量,在LQT1患者增加,但不是LQT2患者. 这一发现可能解释了为什么LQT1患者体验更多与运动有关的心脏事件.

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Electrocardiogram Recordings in Anesthetized Mice using Lead II
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Electrocardiogram Recordings in Anesthetized Mice using Lead II

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02:47

Exercise Test for Evaluation of the Functional Efficacy of the Pig Cardiovascular System

Published on: May 12, 2023

相关实验视频

Last Updated: Jun 9, 2026

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
07:15

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Published on: January 16, 2019

Electrocardiogram Recordings in Anesthetized Mice using Lead II
04:16

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Published on: June 20, 2020

Exercise Test for Evaluation of the Functional Efficacy of the Pig Cardiovascular System
02:47

Exercise Test for Evaluation of the Functional Efficacy of the Pig Cardiovascular System

Published on: May 12, 2023

科学领域:

  • 心脏病学 心脏病学
  • 电子生理学 电子生理学
  • 遗传学 是一个遗传学.

背景情况:

  • 电心电图上的Tpe间隔可能反映出复极化的跨壁分散 (TDR).
  • 在LQT1模型中,β-上腺刺激可以放大TDR.
  • 长QT综合征 (LQTS) 是一种影响心脏复极化的遗传性疾病.

研究的目的:

  • 在LQTS患者中检查T波形态和再极化参数.
  • 为了比较LQT1和LQT2患者在休息和运动期间的再极化.
  • 为了研究Tpe变化和运动诱导的心脏事件之间的关系.

主要方法:

  • 评估了82名LQTS患者 (51名LQT1,31名LQT2) 和33名对照.
  • 在12导电心电图上测量了正确的QT (QTc) 和正确的Tpe (Tpec) 间隔.
  • 评估了休息状态和运动压力测试期间的T波形态和再极化参数.

主要成果:

  • 与基线对照组相比,LQT1和LQT2患者的QTc和Tpec显著延长.
  • 在LQT1患者中,运动显著延长了QTc和Tpec,改变了T波形态.
  • 在LQT2患者中,运动没有显著改变QTc或Tpec,但诱导了T波划痕.

结论:

  • 在LQT1患者中,Tpe间隔在运动期间增加,与LQT2患者不同.
  • 在LQT1中,这种运动诱导的Tpe延长可能会导致他们患有与运动相关的致命心脏事件的风险更高.
  • 运动期间的T波形态变化在LQT1和LQT2.2之间是不同的.