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Related Concept Videos

Cardiac Action Potential01:30

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
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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 of...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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, and...
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...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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...

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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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Early repolarization pattern: innocent finding or marker of risk?

Luigi De Ambroggi1, Antonio Sorgente, Guido De Ambroggi

  • 1Arrhythmias and Electrophysiology Center, IRCCS Policlinico San Donato, San Donato Milanese, Milan, Italy. luigi.deambroggi@grupposandonato.it

Journal of Electrocardiology
|April 2, 2013
PubMed
Summary

Early repolarization (ER) patterns on ECGs, characterized by J-point elevation, are common. While often benign in athletes, specific ER findings may indicate increased ventricular fibrillation risk, though long-term significance requires further study.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Sports Medicine

Background:

  • Early repolarization (ER) patterns, defined by J-point elevation and QRS slurring/notching (J waves), are frequently observed on 12-lead ECGs.
  • ER is often considered benign in young, healthy individuals, including athletes, males, and Black individuals.
  • Conflicting evidence exists regarding the association between ER patterns and the risk of ventricular fibrillation (VF).

Purpose of the Study:

  • To investigate the prevalence of J waves and QRS slurring in young competitive athletes who experienced cardiac arrest compared to control athletes.
  • To assess the prognostic significance of these ER patterns following sport discontinuation.

Main Methods:

  • A case-control study comparing 21 young competitive athletes with cardiac arrest to 365 control athletes without cardiac arrest.
  • ECG analysis focusing on J wave and/or QRS slurring in inferior and lateral leads (V4-V6).
  • 36-month follow-up after sport discontinuation to monitor arrhythmia recurrences.

Main Results:

  • The prevalence of J wave and/or QRS slurring was significantly higher in athletes who experienced cardiac arrest compared to controls.
  • No significant difference in arrhythmia recurrence rates was observed between athletes with and without J waves or QRS slurring during follow-up.
  • Rapidly ascending ST segments after the J point appear to be a generally benign ER pattern.

Conclusions:

  • Specific early repolarization patterns, like J waves and QRS slurring, may be more prevalent in young athletes experiencing cardiac arrest.
  • The long-term prognostic value of various ER patterns remains unclear.
  • Standardized definitions and measurements for ER are crucial for future research and clinical interpretation.