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

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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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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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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...
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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, 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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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Dissimilar ventricular rhythms: implications for ICD therapy.

S Serge Barold1, Andreas Kucher, Herbert Nägele

  • 1Florida Heart Rhythm Institute, Tampa, Florida 33615, USA. ssbarold@aol.com

Heart Rhythm
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Left ventricular (LV) sensing in cardiac resynchronization therapy (CRT) devices can reveal dissimilar ventricular rhythms. These arrhythmias may explain sudden cardiac death cases and impact implantable cardioverter-defibrillator therapy.

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16:40

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation

Published on: February 28, 2012

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Cardiac resynchronization therapy (CRT) devices often include left ventricular (LV) sensing.
  • This LV sensing function is not universally present in all contemporary CRT devices.
  • LV electrogram recordings offer diagnostic data beyond standard right ventricular electrograms.

Purpose of the Study:

  • To investigate the utility of LV sensing in identifying dissimilar ventricular rhythms and tachyarrhythmias.
  • To explore the clinical significance of these arrhythmias in patients with CRT devices.
  • To determine if LV sensing can provide insights into unexplained sudden death.

Main Methods:

  • Utilized the LV sensing capability of Biotronik CRT defibrillators.
  • Analyzed recorded LV electrograms to identify distinct ventricular rhythms.
  • Correlated findings with patient outcomes and implantable cardioverter-defibrillator (ICD) therapy.

Main Results:

  • Identified 3 cases exhibiting dissimilar ventricular rhythms or tachyarrhythmias.
  • Observed that slower right ventricular activity could interfere with or delay life-saving ICD therapy for faster LV tachyarrhythmias.
  • Highlighted that such arrhythmias may be underdiagnosed and contribute to unexplained sudden death.

Conclusions:

  • LV sensing in CRT devices is valuable for detecting complex ventricular arrhythmias.
  • Dissimilar ventricular rhythms pose a significant clinical challenge, potentially masking or delaying appropriate ICD interventions.
  • Further research is warranted to understand the prevalence and implications of these arrhythmias for sudden cardiac death prevention.