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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.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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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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Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH...
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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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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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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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Updated: Apr 27, 2026

Author Spotlight: Accurately Assessing Thyroid Hormone-Driven Motor Alterations in Mouse
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Arrhythmia and thyroid dysfunction.

S Marrakchi1, F Kanoun, S Idriss

  • 1Abderrahmane Mami hospital, Tunis, Tunisia, marrakchi.sonia@yahoo.fr.

Herz
|July 4, 2014
PubMed
Summary
This summary is machine-generated.

Thyroid dysfunction, both overt and subclinical, increases arrhythmia risk. Promptly treating thyroid disease is crucial for improving patient outcomes and managing arrhythmias effectively.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Internal Medicine

Background:

  • Arrhythmia poses a significant health burden in Europe and the US.
  • Thyroid disease is a known risk factor for cardiac arrhythmias.
  • Overt and subclinical thyroid dysfunction require careful evaluation in arrhythmia patients.

Purpose of the Study:

  • To review prospective studies on arrhythmia risk in thyroid disease.
  • To assess the impact of overt and subclinical thyroid dysfunction on arrhythmia development.
  • To discuss current management strategies for arrhythmias associated with thyroid disorders.

Main Methods:

  • Comprehensive literature search for relevant prospective studies.
  • Inclusion of studies published in English.
  • Keywords included thyroid conditions, treatments, and various arrhythmia types.

Main Results:

  • Untreated overt and subclinical thyroid dysfunction are linked to higher arrhythmia risk.
  • Hyperthyroidism is associated with an increased incidence of atrial arrhythmias.
  • Hypothyroidism is correlated with an increased incidence of ventricular arrhythmias.

Conclusions:

  • Early detection and treatment of thyroid dysfunction are essential for patients with arrhythmias.
  • Effective management of thyroid disorders can improve the long-term prognosis of cardiac arrhythmias.
  • Addressing thyroid dysfunction is a mandatory step in comprehensive arrhythmia care.