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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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.
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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...
Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

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...
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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.
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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

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

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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Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
06:07

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Published on: May 23, 2021

Arrhythmias in sport.

B Carù1, L Mauri, B Andreuzzi

  • 1Divisione Cardiologica A. De Gasperis, Ospedale Cà Granda, Milano, Italy.

European Heart Journal
|August 1, 1987
PubMed
Summary

Athletes experience arrhythmias, with bradyarrhythmias more common due to training. While tachyarrhythmias occur similarly to the general population, underlying heart conditions are often found in symptomatic athletes.

Area of Science:

  • Cardiology
  • Sports Medicine
  • Exercise Physiology

Background:

  • Arrhythmias are not uncommon in athletes.
  • Bradyarrhythmias are more frequent in athletes than the general population, often due to training-induced vagal hypertony.
  • Tachyarrhythmias occur in athletes at similar rates to sedentary individuals.

Purpose of the Study:

  • To investigate the prevalence and characteristics of arrhythmias in athletes.
  • To identify underlying cardiac conditions in athletes experiencing symptomatic tachyarrhythmias.
  • To determine the relationship between exercise and arrhythmias in athletes.

Main Methods:

  • Utilized exercise testing, Holter monitoring, and electrophysiological testing in 32 athletes with tachyarrhythmias.
  • Assessed athletes presenting with symptomatic tachyarrhythmias.

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  • Conducted a 1-5 year follow-up on arrhythmia recurrence.

    • Main Results:

    • An underlying organic cardiac disorder was identified in 26 of 32 athletes.
    • In 75% of cases with identified disorders, arrhythmias showed a strong relation to exercise.
    • During follow-up, 12 athletes experienced arrhythmia recurrence despite medical treatment.

    Conclusions:

    • Symptomatic tachyarrhythmias in athletes are frequently associated with underlying cardiac abnormalities.
    • Exercise plays a significant role in the manifestation of arrhythmias in many athletes.
    • Sport itself is not directly responsible for causing these arrhythmias.