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Related Concept Videos

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

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

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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...
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Disturbances in Heart Rhythm01:29

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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.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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.
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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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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

542
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...
542
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

626
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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Related Experiment Video

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Primary Outcome Assessment in a Pig Model of Acute Myocardial Infarction
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Ventricular Arrhythmia after Acute Myocardial Infarction: 'The Perfect Storm'.

Justine Bhar-Amato1, William Davies1, Sharad Agarwal1

  • 1Papworth Hospital NHS Foundation Trust, Papworth Everard, Cambridge, United Kingdom.

Arrhythmia & Electrophysiology Review
|October 12, 2017
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Summary
This summary is machine-generated.

Ventricular tachyarrhythmias (VAs) are a common cause of sudden cardiac death after myocardial infarction (MI). Early detection and risk assessment are crucial for managing VAs and improving patient survival post-MI.

Keywords:
Acute myocardial infarctionmanagementrisk assessmentventricular arrhythmias

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Acute Coronary Syndromes

Background:

  • Ventricular tachyarrhythmias (VAs) are a frequent complication following acute myocardial infarction (MI).
  • The incidence and impact of VAs have evolved with advancements in reperfusion therapies like thrombolysis and percutaneous coronary intervention.
  • VAs can independently affect mortality rates in patients recovering from MI.

Purpose of the Study:

  • To highlight the significance of VAs in the context of acute MI.
  • To emphasize the need for risk stratification and timely intervention for patients with VAs post-MI.
  • To identify areas requiring further research in VA management after infarction.

Main Methods:

  • Review of existing literature on ventricular tachyarrhythmias in acute myocardial infarction.
  • Analysis of the impact of modern reperfusion strategies on VA occurrence and outcomes.
  • Discussion of clinical implications for risk assessment and patient management.

Main Results:

  • VAs remain a significant cause of mortality, particularly early after acute MI.
  • The natural history of MI and subsequent VAs is modified by reperfusion therapies.
  • The presence of VAs is an independent predictor of mortality in post-MI patients.

Conclusions:

  • Risk assessment and appropriate treatment for VAs are essential in MI survivors.
  • Further research is needed to optimize the prevention and treatment of hemodynamically significant VAs in the post-infarct period.
  • Strategies for managing sudden cardiac death remote from the initial MI event require continued investigation.