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Related Concept Videos

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...
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...
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.
Disturbances in Heart Rhythm01:29

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...
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 III: Characteristics of Dysrhythmias01:29

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.

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

Ricardo O Escárcega1, Mario Jiménez-Hernández, Mario Garcia-Carrasco

  • 1Internal Medicine, Temple University Hospital, Philadelphia, Pennsylvania 19140, USA. orlando.escarcega@tuhs.temple.edu

Acta Cardiologica
|February 5, 2010
PubMed
Summary
This summary is machine-generated.

Brugada syndrome is an inherited heart condition linked to SCN5A gene mutations. This review covers its genetics, diagnosis, and management, focusing on electrocardiographic patterns and sudden cardiac death risk.

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Published on: December 28, 2012

Area of Science:

  • Cardiology
  • Genetics
  • Molecular Biology

Background:

  • Brugada syndrome is an inherited cardiac disorder characterized by specific ECG abnormalities and risk of sudden cardiac death.
  • Genetic mutations, particularly in the SCN5A gene encoding the cardiac sodium channel, are implicated.
  • Diagnostic criteria and management strategies have evolved since its initial description.

Purpose of the Study:

  • To review the genetics and molecular biology of Brugada syndrome.
  • To outline the diagnostic criteria, including clinical and electrocardiographic features.
  • To discuss current management and risk stratification approaches.

Main Methods:

  • Literature review of genetics, molecular biology, and clinical studies.
  • Analysis of diagnostic criteria from consensus reports.
  • Synthesis of current therapeutic and risk stratification strategies.

Main Results:

  • Brugada syndrome is associated with mutations in the SCN5A gene.
  • Distinct electrocardiographic patterns (coved and saddleback ST elevation) are observed, with coved type linked to higher risk.
  • Risk stratification and therapeutic approaches are based on clinical and ECG findings.

Conclusions:

  • Understanding the genetic basis and molecular mechanisms is crucial for Brugada syndrome.
  • Accurate diagnosis relies on specific clinical and ECG criteria.
  • Tailored management strategies are essential for reducing the risk of sudden cardiac death.