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Related Concept Videos

Disturbances in Heart Rhythm01:29

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.
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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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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Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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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...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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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...
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Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

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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...
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Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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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...
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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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J wave pattern in unexplained syncope.

Susanne Löbe1, Jelena Kornej1, Arash Arya1

  • 1Department of Electrophysiology, Heart Center Leipzig, Leipzig, Germany.

Journal of Electrocardiology
|August 2, 2015
PubMed
Summary
This summary is machine-generated.

The J wave pattern (JWP) on ECGs is linked to higher risks. This study found JWP more common in unexplained syncope than vasovagal syncope, suggesting a worse prognosis.

Keywords:
ElectrocardiogramJ wave patternSyncope

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • The J wave pattern (JWP), identified by J-point elevation on ECGs, is a known risk factor for idiopathic ventricular fibrillation and mortality.
  • The prevalence and significance of JWP in patients experiencing syncope of various causes remain largely uncharacterized.

Purpose of the Study:

  • To investigate the prevalence of the J wave pattern in patients with vasovagal syncope versus those with unexplained syncope.
  • To explore the potential association between JWP and the prognosis of unexplained syncope.

Main Methods:

  • A study involving 170 consecutive patients diagnosed with either vasovagal syncope or syncope of unknown etiology after comprehensive evaluation.
  • Electrocardiographic analysis to identify the presence and characteristics of the J wave pattern, specifically in inferior leads with horizontal/descending ST-segment morphology.

Main Results:

  • The J wave pattern, particularly with a horizontal/descending ST-segment in inferior leads, was observed more frequently in patients with unexplained syncope compared to those with vasovagal syncope.
  • This higher prevalence suggests a potential link between JWP and a poorer outcome in unexplained syncope cases.

Conclusions:

  • The J wave pattern in inferior leads may serve as an indicator differentiating unexplained syncope from vasovagal syncope.
  • Findings suggest that JWP could be associated with a worse prognosis in patients presenting with unexplained syncope, warranting further investigation.