Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

23
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...
23
Decreased pulse rate01:14

Decreased pulse rate

592
Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
592
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

1.0K
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.
1.0K
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

1.2K
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...
1.2K
Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

32
Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
32
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

311
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,...
311

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Prognostic importance of septal deformation patterns and lateral wall function in patients with heart failure and left bundle branch block receiving cardiac resynchronization therapy.

European heart journal. Imaging methods and practice·2026
Same author

Echocardiographic assessment of left ventricular volumes: a comparison of different methods in athletes.

Clinical research in cardiology : official journal of the German Cardiac Society·2024
Same author

Contractile asymmetry and survival in patients with left bundle branch abnormality treated with cardiac resynchronization therapy.

European heart journal. Imaging methods and practice·2024
Same author

Association of secondary mitral regurgitation and right ventricular dysfunction among patients with non-ischaemic cardiomyopathy.

European heart journal. Cardiovascular Imaging·2024
Same author

Education level and the use of coronary computed tomography, functional testing, coronary angiography, revascularization, and outcomes-a 10-year Danish, nationwide, registry-based follow-up study.

European heart journal. Quality of care & clinical outcomes·2023
Same author

Dynamics in myocardial deformation as an indirect marker of myocardial involvement in acute myocarditis due to HIV infection: a case report.

European heart journal. Case reports·2021

Related Experiment Video

Updated: Aug 23, 2025

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
09:20

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Published on: July 5, 2021

3.1K

Recurrent syncope in patients with a pacemaker and bradyarrhythmia.

Julie Majormoen Davidsen1, Regitze Skals2, Frederik Dalgaard3

  • 1Department of Neurology, Zealand University Hospital, Roskilde, Denmark.

Scandinavian Cardiovascular Journal : SCJ
|November 7, 2022
PubMed
Summary

Nearly one in five patients with bradyarrhythmia experienced recurrent syncope within five years of pacemaker implantation. Sinus node dysfunction and male sex were linked to a higher risk of recurrent syncope.

Keywords:
Pacingbradyarrhythmiapacemakerrecurrent syncopesick sinus syndromesyncope

More Related Videos

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

Published on: December 11, 2017

10.5K
Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice
08:05

Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice

Published on: June 29, 2022

2.9K

Related Experiment Videos

Last Updated: Aug 23, 2025

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
09:20

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Published on: July 5, 2021

3.1K
Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

Published on: December 11, 2017

10.5K
Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice
08:05

Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice

Published on: June 29, 2022

2.9K

Area of Science:

  • Cardiology
  • Electrophysiology
  • Public Health

Background:

  • Pacemakers treat syncope in bradyarrhythmia patients.
  • Previous studies on recurrent syncope risk post-pacemaker implantation are limited.
  • This study addresses the need for larger investigations into this risk.

Purpose of the Study:

  • To investigate the risk of recurrent syncope after pacemaker implantation.
  • Focus on patients with bradyarrhythmia and a history of syncope.
  • Identify factors associated with recurrent syncope.

Main Methods:

  • Retrospective, population-based cohort study.
  • Utilized Danish nationwide registers (1996-2017).
  • Included patients with prior syncope and pacemaker implantation; analyzed using cumulative incidence and Cox regression.

Main Results:

  • 11,126 patients included (median age 78).
  • 5-year cumulative incidence of recurrent syncope was 19.6%.
  • Sinus node dysfunction, unspecified bradyarrhythmia, male sex, cerebrovascular disease, and prior syncope frequency increased risk.

Conclusions:

  • Recurrent syncope affects nearly 20% of patients within five years post-pacemaker implantation.
  • Sinus node dysfunction and unspecified bradyarrhythmia carry higher risks than AV block.
  • Male sex, cerebrovascular disease, and prior syncope history are significant risk factors.