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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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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...
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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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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.
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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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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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Related Experiment Video

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Atrial premature beat bigeminy with slow pathway conduction causing regular RR intervals.

Xingjie Li1, Yanmei Wang2

  • 1Department of Electrocardiogram Room, Jining NO.1 People's Hospital, Jining, Shandong, China..

Journal of Electrocardiology
|April 1, 2026
PubMed
Summary

This study details a rare case of atrial premature beat bigeminy where fast and slow pathways conducted differently, creating alternating QRS complexes. The findings clarify a complex electrocardiographic pattern mimicking other arrhythmias.

Keywords:
Accelerated junctional rhythmAtrial premature beat (APB)Atrioventricular dissociationBigeminyDual pathway conduction

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • Atrial premature beats (APBs) can manifest with varying conduction patterns.
  • Understanding atrioventricular (AV) nodal physiology is crucial for interpreting complex arrhythmias.
  • Differentiating APB bigeminy from other regular tachycardias is clinically significant.

Purpose of the Study:

  • To elucidate the pathogenesis of a rare electrocardiographic phenomenon involving APB bigeminy.
  • To describe the distinct conduction properties of the fast pathway (FP) and slow pathway (SP) in this case.
  • To differentiate this presentation from accelerated junctional rhythm with interfering AV dissociation.

Main Methods:

  • Case report analysis of a 74-year-old female patient.
  • Electrocardiographic (ECG) interpretation focusing on QRS complex morphology and RR intervals.
  • Analysis of atrial and ventricular activation sequences based on ECG findings.

Main Results:

  • The patient exhibited APB bigeminy with alternating QRS morphologies.
  • Sinus beats conducted via the FP, while APBs conducted via the SP.
  • Regular RR intervals were observed, mimicking accelerated junctional rhythm with interfering AV dissociation.

Conclusions:

  • APB bigeminy can present with distinct conduction characteristics through the AV node's fast and slow pathways.
  • This phenomenon highlights the importance of detailed ECG analysis to avoid misdiagnosis.
  • The findings contribute to the understanding of rare cardiac electrophysiological events.