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Related Concept Videos

Cardiac Action Potential01:30

Cardiac Action Potential

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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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Electrocardiogram01:29

Electrocardiogram

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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...
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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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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...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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.
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...
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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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Related Experiment Video

Updated: May 1, 2026

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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Brugada phenocopy: A new electrocardiogram phenomenon.

Daniel D Anselm1, Jennifer M Evans1, Adrian Baranchuk1

  • 1Daniel D Anselm, Jennifer M Evans, Adrian Baranchuk, Division of Cardiology, Electrophysiology and Pacing, Queen's University, Kingston General Hospital, Kingston, Ontario K7L 2V7, Canada.

World Journal of Cardiology
|March 27, 2014
PubMed
Summary

Brugada phenocopies (BrP) are distinct from Brugada syndrome, presenting specific ECG patterns triggered by various conditions. Understanding BrP mechanisms requires experimental models to differentiate transient channel alterations from other causes.

Keywords:
Brugada phenocopyBrugada syndromeCardiomyopathyElectrocardiogram filtersElectrolytesMyocardial ischemiaPulmonary embolism

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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

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Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
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Related Experiment Videos

Last Updated: May 1, 2026

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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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
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Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • Brugada phenocopies (BrP) mimic Brugada syndrome with specific ECG patterns (Type 1 or 2) but have distinct causes.
  • BrP are triggered by transient conditions like ischemia, pulmonary embolism, or electrolyte imbalances, resolving when the underlying cause is treated.

Purpose of the Study:

  • To discuss the emergence of BrP as a distinct ECG phenomenon.
  • To review current understanding and identify future research directions for BrP.
  • To encourage consistent terminology for BrP in scientific literature.

Main Methods:

  • Review of existing literature on Brugada phenocopies.
  • Discussion of clinical observations, including recurrent BrP in hypokalemia.
  • Conceptual analysis of pathophysiological mechanisms.

Main Results:

  • BrP are etiologically distinct from congenital Brugada syndrome.
  • Recurrent BrP in hypokalemia suggests clinical reproducibility.
  • Experimental models are needed to elucidate BrP pathophysiology.

Conclusions:

  • BrP represent a significant, emerging ECG phenomenon requiring further investigation.
  • Experimental validation is crucial to determine if BrP involve transient sodium channel alterations or other ion channel dysfunctions.
  • Standardized use of the term "Brugada phenocopy" will aid research and establish the concept.