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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

5.0K
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...
5.0K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
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ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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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....
11.1K
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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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,...
637
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

239
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...
239
Bode Plots Construction01:24

Bode Plots Construction

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The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
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Updated: Dec 21, 2025

In Vivo Surface Electrocardiography for Adult Zebrafish
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In Vivo Surface Electrocardiography for Adult Zebrafish

Published on: August 1, 2019

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Conduction Disorders: The Value of Surface ECG.

Rose M F L da Silva1, Alessandra de Souza Maciel1

  • 1Department of Internal Medicine, Faculty of Medicine, University of Minas Gerais, Hospital das Clínicas, Federal, Belo Horizonte/Minas Gerais, Brazil.

Current Cardiology Reviews
|May 12, 2020
PubMed
Summary

Surface electrocardiography (ECG) is crucial for diagnosing cardiac conduction disorders, including atrioventricular and intraventricular blocks. ECG also aids in managing patients with cardiac implantable electronic devices and predicting therapy response.

Keywords:
Cardiac conduction system diseasesbundle-branch blockcardiac resynchronization therapy.electrocardiographyheart conduction systemsinus node dysfunction

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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Cardiac conduction disorders affect the heart's electrical system.
  • Accurate diagnosis is essential for effective patient management.

Purpose of the Study:

  • To highlight the significance of surface electrocardiography (ECG) in diagnosing cardiac conduction disorders.
  • To review current understanding and future directions in ECG for conduction abnormalities.

Main Methods:

  • Literature review using MEDLINE/PubMed with keywords "ECG" and "conduction disorders" (last 10 years).
  • Inclusion of relevant supplementary documents.

Main Results:

  • Detailed description of cardiac electrical system anatomy and function.
  • Epidemiology, etiology, and presentation of sinus node dysfunction, atrioventricular blocks, and intraventricular conduction disorders.
  • Role of ECG in patients with cardiac implantable electronic devices and future perspectives.

Conclusions:

  • Surface ECG reliably diagnoses atrioventricular and intraventricular conduction disorders and their anatomical sites.
  • ECG obviates the need for invasive electrophysiological studies in many cases.
  • ECG is valuable for diagnosing device dysfunction and predicting cardiac resynchronization therapy response.