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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

2.0K
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...
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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,...
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Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

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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

744
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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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

471
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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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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Related Experiment Video

Updated: May 23, 2025

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Syncope and "Normal" ECG: Is Brugada Syndrome the Culprit?

Pamela Ramírez-Rangel1, Luis Emilio Bautista-Torres1, Miguel Angel Lopez-Lizarraga1

  • 1Clinical Cardiology, National Institute of Cardiology Ignacio Chávez, Mexico City, MEX.

Cureus
|May 22, 2025
PubMed
Summary

Brugada syndrome (BrS) is an inherited heart condition linked to sudden cardiac death. This case highlights a young man whose initial normal ECG evolved to a diagnostic Type 1 Brugada pattern, emphasizing the need to rule out phenocopies.

Keywords:
brugada phenocopiesbrugada syndromeelectrocardiogramsyncopeventricular tachycardia

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Area of Science:

  • Cardiology
  • Genetics
  • Electrophysiology

Background:

  • Brugada syndrome (BrS) is an inherited cardiac arrhythmia associated with sudden cardiac death (SCD) in structurally normal hearts, often linked to SCN5A gene variants.
  • The diagnostic hallmark of BrS is the Type 1 electrocardiogram (ECG) pattern, characterized by specific J-point elevation and T-wave morphology in anterior leads.

Observation:

  • The case involves a young male presenting with syncope and an initial non-diagnostic ECG.
  • Subsequent ECG monitoring revealed the development of a Type 1 Brugada pattern.
  • The patient also experienced an episode of non-sustained ventricular tachycardia.

Findings:

  • The study underscores the dynamic nature of ECG manifestations in Brugada syndrome.
  • It emphasizes the critical importance of differentiating true BrS from Brugada phenocopies, which mimic the Type 1 ECG pattern due to various conditions.
  • The case illustrates the potential for syncope and ventricular arrhythmias in patients with evolving BrS.

Implications:

  • Accurate identification of the Type 1 Brugada ECG pattern is crucial for timely diagnosis and management.
  • Ruling out Brugada phenocopies is essential to avoid misdiagnosis and ensure appropriate patient care.
  • This case highlights the need for vigilant ECG monitoring in patients with unexplained syncope, particularly when initial findings are equivocal.