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Related Concept Videos

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...
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...
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.
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 IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...

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Location, Dissection, and Analysis of the Murine Stellate Ganglion
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Location, Dissection, and Analysis of the Murine Stellate Ganglion

Published on: December 22, 2020

Supraventricular and ventricular arrhythmias.

Ramil Goel1, Komandoor Srivathsan, Martina Mookadam

  • 1Department of Cardiovascular Disease, Mayo Clinic, 13400 East Shea Boulevard, Scottsdale, AZ 85259, USA.

Primary Care
|February 14, 2013
PubMed
Summary

This review covers common tachyarrhythmias for primary care physicians, updating knowledge on their mechanisms and management. It aims to equip general practitioners with essential information for diagnosing and treating these cardiac rhythm disorders.

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Location, Dissection, and Analysis of the Murine Stellate Ganglion
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Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping
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Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

Published on: February 22, 2018

Area of Science:

  • Cardiology
  • Internal Medicine

Background:

  • Cardiac arrhythmias are diverse disorders with varied clinical presentations.
  • Arrhythmias can range from benign to life-threatening, often linked to underlying heart conditions.

Purpose of the Study:

  • To provide general practitioners with an overview of common tachyarrhythmias.
  • To update clinicians on recent advancements in understanding arrhythmia mechanisms and management.

Main Methods:

  • Review of current literature on tachyarrhythmias.
  • Synthesis of information on pathophysiology and clinical practice.

Main Results:

  • Common tachyarrhythmias present a spectrum of clinical significance.
  • Recent developments offer improved insights into arrhythmia mechanisms.

Conclusions:

  • Primary care physicians frequently encounter cardiac arrhythmias.
  • Updated knowledge on tachyarrhythmia mechanisms and management is crucial for effective patient care.