Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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...

Mechanism of Cardiac Arrhythmias

Mechanism of Cardiac Arrhythmias

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.

Disturbances in Heart Rhythm

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 Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...

Cardiac Action Potential

Cardiac Action Potential

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

Dysrhythmias III: Characteristics of Dysrhythmias

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.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Optical cooling by interfacial charge transfer in 2D heterostructures.

Nature·2026

Same author

The evolving burden of ischemic heart disease in China, 1990-2023: Three decades of trends, risk factors, and future challenges.

American journal of preventive cardiology·2026

Same author

An Atypical Presentation of an Occlusion Myocardial Infarction Requiring Urgent Revascularization.

Circulation·2026

Same author

Exertional Syncope in a Female Teenage Student.

JAMA cardiology·2026

Same author

Comparative study on femoral neck fractures treatment: partial threaded cannulated screw versus different combinations of partial threaded cannulated screw and fully threaded headless cannulated screw.

Journal of orthopaedic surgery and research·2025

Same author

Anticancer behaviour of simplified lysosome-targeted half-sandwich iridium(III) xanthate complexes towards A549 cell lines.

Journal of inorganic biochemistry·2025

Same journal

Critical Appraisal of Self-Supervised Contrastive Pretraining for Extreme Few-Shot ECG Classification.

Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·2026

Same journal

An Unusual Etiology of Bayés' Syndrome: Fabry Disease.

Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·2026

Same journal

Interpreting ECG-Based Risk Stratification in Women With INOCA: Methodological Considerations From the WISE Cohort.

Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·2026

Same journal

Electrocardiographic Repolarization Changes Following Orchiectomy: Insights Into QT Interval Prolongation and Clinical Implications.

Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·2026

Same journal

Critique on Integrated Heart Sound-Electrocardiogram Synchronization System for Early Detecting Left Ventricular Systolic Dysfunction in Pediatric Populations.

Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·2026

Same journal

Beyond Training Stability: The Need for Clinical Generalizability and Explainability in Self-Supervised ECG Models.

Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc·2026

See all related articles

Search research articles

Related Experiment Video

Updated: May 14, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Published on: July 5, 2021

Hyperkalemia-induced Brugada pattern with electrical alternans.

Renguang Liu¹, Qinghua Chang

¹Cardiovascular Institute, First Affiliated Hospital of Liaoning Medical College, Jinzhou, Liaoning Province, China. liurenguanglaoshi@126.com

Annals of Noninvasive Electrocardiology : the Official Journal of the International Society for Holter and Noninvasive Electrocardiology, Inc

|January 26, 2013

Summary

This summary is machine-generated.

Brugada syndrome, a genetic heart condition, can be triggered by hyperkalemia. Recognizing this link is crucial for preventing sudden cardiac death.

More Related Videos

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

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

Published on: December 28, 2012

Related Experiment Videos

Last Updated: May 14, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Published on: July 5, 2021

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

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

Published on: December 28, 2012

Area of Science:

Cardiology
Genetics
Electrophysiology

Background:

Brugada syndrome is an inherited cardiac condition associated with an increased risk of syncope and sudden cardiac death.
Genetic mutations, particularly in the SCN5A gene, are the primary cause of Brugada syndrome.
The syndrome is characterized by specific electrocardiogram (ECG) abnormalities.

Observation:

This case report focuses on a patient presenting with symptoms suggestive of Brugada syndrome.
The patient exhibited electrical alternans, an ECG finding indicating variability in the electrical activity of the heart.
Hyperkalemia, a condition of elevated potassium levels in the blood, was identified as a significant factor.

Findings:

The findings underscore the potential for acquired Brugada sign to be triggered by metabolic disturbances.
Hyperkalemia was identified as a critical trigger for the development of the Brugada sign and electrical alternans in this case.
This highlights the importance of considering electrolyte imbalances in the differential diagnosis of Brugada syndrome presentations.

Implications:

Recognizing hyperkalemia as a trigger is vital for timely diagnosis and management of Brugada syndrome.
This case emphasizes the need for comprehensive patient evaluation, including electrolyte assessment, in cases of syncope or unexplained cardiac events.
Early identification and correction of hyperkalemia can potentially mitigate the risk of life-threatening arrhythmias associated with Brugada syndrome.