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Related Concept Videos

Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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...
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
Mechanism of Cardiac Arrhythmias01:28

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.
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...

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Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples
14:39

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Published on: April 21, 2014

J-wave syndromes. from cell to bedside.

Charles Antzelevitch1, Gan-Xin Yan

  • 1Masonic Medical Research Laboratory, Utica, NY 13501, USA. ca@mmrl.edu

Journal of Electrocardiology
|September 13, 2011
PubMed
Summary

Early repolarization (ER) patterns, once considered benign, are now linked to life-threatening arrhythmias. These J-wave syndromes, including ER syndrome and Brugada syndrome, represent a spectrum of risk based on J-wave manifestation.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • J waves on electrocardiograms, often seen as J-point elevation, were historically considered benign.
  • Early repolarization (ER) patterns, characterized by J-point elevation and ST-segment changes, were also deemed harmless.

Purpose of the Study:

  • To re-evaluate the clinical significance of early repolarization patterns.
  • To explore the relationship between early repolarization syndrome, Brugada syndrome, and J-wave syndromes.
  • To classify early repolarization syndrome based on risk stratification.

Main Methods:

  • Analysis of electrocardiographic findings, specifically J-wave and early repolarization patterns.
  • Comparison of clinical outcomes and risk factors between early repolarization syndrome and Brugada syndrome.

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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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  • Classification of early repolarization syndrome into subtypes based on lead distribution.

    • Main Results:

    • Early repolarization patterns in inferior or inferolateral leads are associated with increased risk of life-threatening arrhythmias (early repolarization syndrome).
    • Early repolarization syndrome and Brugada syndrome share commonalities in electrocardiographic features, risk factors, and arrhythmic mechanisms.
    • Early repolarization syndrome subtypes (Type 1: lateral precordial, Type 2: inferior/inferolateral, Type 3: global) show escalating risk for malignant arrhythmias.

    Conclusions:

    • Early repolarization syndrome and Brugada syndrome are part of a continuous spectrum of J-wave syndromes.
    • Risk stratification of early repolarization syndrome is possible based on the location and pattern of J-wave abnormalities.
    • Understanding J-wave syndromes is crucial for identifying patients at risk for sudden cardiac death.