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Related Concept Videos

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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Structure of Cardiac Muscles01:13

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Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
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Imbalances in Cardiac Output01:26

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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Disturbances in Heart Rhythm01:28

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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...
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Myasthenia Gravis: Diagnostic Tests01:15

Myasthenia Gravis: Diagnostic Tests

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Myasthenia gravis is an autoimmune condition affecting neuromuscular transmission, causing generalized weakness in skeletal muscles. Initial diagnoses rely on patients' signs, symptoms, and medical history. The challenge lies in distinguishing myasthenia from other muscular dystrophies. An important diagnostic feature is the significant improvement of symptoms after administering anticholinesterase inhibitors.
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Specialized Characteristics of Cardiac Muscles01:27

Specialized Characteristics of Cardiac Muscles

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The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
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Updated: Jul 6, 2025

Isolation of Atrial Myocytes from Adult Mice
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Isolation of Atrial Myocytes from Adult Mice

Published on: July 25, 2019

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Atrial myopathy.

Muhammad Umer Riaz Gondal1, Raja Sadam Mehmood2, Rahmeen Pervaiz Khan2

  • 1Department of Medicine, Reading Hospital, PA, USA.

Current Problems in Cardiology
|January 8, 2024
PubMed
Summary
This summary is machine-generated.

Atrial myopathy, a condition linked to aging and inflammation, increases stroke risk independently of atrial fibrillation (AF). Identifying atrial myopathy can guide anticoagulation decisions in AF patients.

Keywords:
AnticoagulationAtrial fibrillationAtrial myopathyInflammationStroke

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Sterile Pericarditis in Aachener Minipigs As a Model for Atrial Myopathy and Atrial Fibrillation
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Area of Science:

  • Cardiology
  • Pathophysiology
  • Biomedical Research

Background:

  • Atrial myopathy is a progressive condition affecting atrial characteristics.
  • The link between atrial myopathy, atrial fibrillation (AF), and stroke is complex.
  • Current understanding seeks additional stroke risk factors beyond paroxysmal AF episodes.

Purpose of the Study:

  • To explore the development and impact of atrial myopathy.
  • To elucidate the relationship between atrial myopathy, AF, and stroke.
  • To propose clinical strategies for identifying atrial myopathy and guiding anticoagulation.

Main Methods:

  • Investigation of animal models.
  • Human studies.
  • Analysis of aging, inflammation, oxidative stress, and mechanical stretching mechanisms.

Main Results:

  • Identified interrelations among aging, inflammation, oxidative stress, and stretching in atrial myopathy development.
  • Demonstrated contribution to fibrosis, electrical alterations, autonomic remodeling, and pro-thrombotic state.
  • Established a detrimental cycle exacerbating atrial myopathy, AF, and stroke risk.

Conclusions:

  • Atrial myopathy is a significant risk factor for stroke, distinct from AF.
  • Methods for identifying patients with atrial myopathy are discussed.
  • Incorporating atrial myopathy into clinical practice can refine anticoagulation strategies for AF patients.