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Related Concept Videos

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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.
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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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Mechanism of Cardiac Arrhythmias01:28

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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, 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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The pathophysiology of Acute Coronary Syndrome [ACD] involves several key processes:The main underlying cause of ACD is atherosclerosis, a chronic inflammatory disease characterized by the buildup of lipid-laden plaques within the coronary arteries.As the atherosclerotic plaque grows in the coronary artery, it may become unstable due to the formation of a lipid-rich core and a thin fibrous cap. Inflammatory cells within the plaque, such as macrophages, secrete enzymes that degrade the...
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Related Experiment Video

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Atrial Fibrillation Structural Substrates: Aetiology, Identification and Implications.

Ahmed M Al-Kaisey1,2, Ramanathan Parameswaran1,2, Jonathan M Kalman1,2

  • 1Department of Cardiology, Royal Melbourne Hospital, Melbourne, Victoria, Australia.

Arrhythmia & Electrophysiology Review
|November 26, 2020
PubMed
Summary

Atrial remodeling involves electrical, structural, and mechanical changes in patients with atrial fibrillation (AF). Targeted interventions may reverse these changes, guiding tailored ablation strategies for better AF outcomes.

Keywords:
AFatrial remodellingatrial substrateelectroanatomic mappinglow-voltage areareverse remodelling

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Science

Background:

  • Atrial remodeling encompasses electrical, structural, and mechanical alterations in the atria of patients with atrial fibrillation (AF).
  • Risk factors for AF contribute to the development of the atrial substrate.
  • Evidence suggests that atrial remodeling reversal may be achievable through targeted interventions.

Purpose of the Study:

  • To review the electrophysiological changes characterizing the atrial substrate in patients with AF risk factors.
  • To discuss the challenges in mapping the atrial substrate.
  • To explore the implications for developing tailored ablation strategies to improve AF patient outcomes.

Main Methods:

  • Literature review of electrophysiological changes in atrial fibrillation.
  • Analysis of risk factors contributing to atrial substrate development.
  • Discussion of mapping techniques and their limitations.
  • Exploration of ablation strategy development.

Main Results:

  • Atrial remodeling is characterized by specific electrophysiological changes.
  • Mapping the atrial substrate presents significant challenges.
  • Understanding remodeling is crucial for effective ablation strategies.

Conclusions:

  • Atrial remodeling is a key feature of AF, involving complex electrophysiological, structural, and mechanical changes.
  • Effective management of AF may involve interventions aimed at reversing atrial remodeling.
  • Tailored ablation strategies, informed by substrate mapping, are essential for improving patient outcomes in AF.