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Related Concept Videos

Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

1.5K
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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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...
195
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

148
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...
148
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

477
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,...
477
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

1.1K
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 I: Introduction01:15

Dysrhythmias I: Introduction

186
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...
186

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Related Experiment Video

Updated: Oct 7, 2025

Rat Model of Right-Sided Cardiac Remodeling and Arrhythmia Using Pulmonary Artery Banding
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Rat Model of Right-Sided Cardiac Remodeling and Arrhythmia Using Pulmonary Artery Banding

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Arrhythmias in COVID-19.

Summit Pandat1, Zhihao Zhu2, Stephanie Fuentes-Rojas1

  • 1Houston Methodist DeBakey Heart & Vascular Center, Houston Methodist Hospital, Houston, Texas, US.

Methodist Debakey Cardiovascular Journal
|January 7, 2022
PubMed
Summary

The coronavirus pandemic causes cardiovascular issues, including arrhythmias like sinus bradycardia and atrial fibrillation. Long-term complications such as POTS and inappropriate sinus tachycardia can also occur post-infection.

Keywords:
COVID-19arrhythmiaatrial fibrillationcoronavirus

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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

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Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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Last Updated: Oct 7, 2025

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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
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Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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Area of Science:

  • Cardiology
  • Infectious Diseases
  • Public Health

Background:

  • The coronavirus pandemic presents a significant global health challenge with diverse systemic effects.
  • Cardiovascular manifestations, particularly arrhythmias, are a key concern requiring further investigation.

Purpose of the Study:

  • To review current data on the incidence and outcomes of arrhythmias during acute and convalescent phases of coronavirus disease.
  • To explore potential pathophysiologic mechanisms and medical management strategies for these arrhythmias.

Main Methods:

  • Review of observational studies and cohort data.
  • Synthesis of current literature on coronavirus-associated cardiovascular complications.

Main Results:

  • Sinus bradycardia is an unexpected inflammatory response during the acute phase.
  • Atrial fibrillation is the most common pathological arrhythmia and a marker of poor prognosis.
  • Long-term complications include postural orthostatic tachycardia syndrome and inappropriate sinus tachycardia.

Conclusions:

  • Coronavirus disease significantly impacts cardiovascular health, leading to various arrhythmias.
  • Understanding these arrhythmias is crucial for patient management and improving outcomes.