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Related Concept Videos

Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

674
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...
674
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

800
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...
800
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

3.5K
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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Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

766
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...
766
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

907
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...
907
Increased pulse rate01:17

Increased pulse rate

1.5K
Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
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Related Experiment Video

Updated: Mar 24, 2026

In Vivo Surface Electrocardiography for Adult Zebrafish
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Irregular Wide Complex Tachycardia in a Young Man.

Yogita Rochlani, Naga Venkata Pothineni, Hakan Paydak

    The Journal of the Arkansas Medical Society
    |March 5, 2016
    PubMed
    Summary

    Wolf Parkinson White syndrome, a pre-excitation disorder, can manifest as irregular wide complex tachycardia, potentially leading to sudden cardiac death. Early recognition and appropriate management, avoiding AV nodal blockers, are crucial.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Medical Diagnostics

    Background:

    • Wolf Parkinson White (WPW) syndrome is a cardiac pre-excitation disorder caused by an accessory electrical conduction pathway.
    • Standard electrocardiography (ECG) in WPW syndrome typically shows a short PR interval, prolonged QRS duration, and delta waves during normal sinus rhythm.

    Observation:

    • Atrial fibrillation in patients with WPW syndrome can present as irregular wide complex tachycardia.
    • This presentation can be the initial sign of the underlying conduction abnormality, particularly in younger individuals.
    • Irregular wide complex tachycardia carries a risk of precipitating ventricular fibrillation and sudden cardiac death.

    Findings:

    • Emergency management for hemodynamically unstable patients with irregular wide complex tachycardia includes synchronized cardioversion.

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  • Intravenous Procainamide is a recommended treatment for hemodynamically stable patients.
  • Agents that block the atrioventricular (AV) nodal pathway must be avoided in managing these patients.

    • Implications:

    • Recognizing irregular wide complex tachycardia as a potential sign of WPW syndrome is critical for timely intervention.
    • Radiofrequency ablation is the definitive treatment for WPW syndrome, addressing the accessory pathway.
    • Appropriate emergency management can mitigate the risk of life-threatening arrhythmias associated with WPW syndrome.