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Related Concept Videos

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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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,...
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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 I: Introduction01:15

Dysrhythmias I: Introduction

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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...
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Conduction System of the Heart01:20

Conduction System of the Heart

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
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Decreased pulse rate01:14

Decreased pulse rate

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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...
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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Sinus Node Dysfunction.

Neeraj Sathnur1, Emanuel Ebin2, David G Benditt2

  • 1Cardiac Arrhythmia Service, Cardiovascular Division, University of Minnesota Medical School, Minneapolis, MN, USA; Cardiovascular Medicine, University of Minnesota Medical School, Mail Code 508, 420 Delaware St SE, Minneapolis, MN 55455, USA; Cardiac Electrophysiology, Park-Nicollet Medical Center, St Louis Park, Minneapolis, MN, USA.

Cardiology Clinics
|June 15, 2023
PubMed
Summary
This summary is machine-generated.

Sinus node dysfunction (SND), common in older adults, is diagnosed via ECG. Treatment focuses on managing bradycardia and tachycardia symptoms to prevent syncope and falls.

Keywords:
BradycardiaBradycardia-tachycardia syndromeSick sinus syndromeSinus node dysfunction

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Geriatrics

Background:

  • Sinus node dysfunction (SND) is a complex cardiac disorder.
  • It predominantly affects older individuals but can occur at any age.
  • SND diagnosis relies heavily on electrocardiogram (ECG) findings.

Purpose of the Study:

  • To outline the diagnostic approach to sinus node dysfunction.
  • To discuss treatment strategies for SND, considering coexisting conditions.
  • To emphasize the importance of preventing bradyarrhythmia and tachyarrhythmia complications.

Main Methods:

  • Diagnosis primarily involves documenting ECG manifestations of SND.
  • Electrophysiologic studies (EPS) have limited diagnostic utility.
  • Treatment decisions are guided by patient symptoms and ECG patterns.

Main Results:

  • SND diagnosis is established through characteristic ECG findings.
  • Coexistence of bradycardia and tachycardia is common in SND patients.
  • Elderly patients with SND often have comorbidities like hypertension and coronary artery disease.

Conclusions:

  • Effective management of SND requires addressing both bradyarrhythmia and tachyarrhythmia.
  • Preventing complications such as syncope, falls, and thromboembolism is crucial.
  • Treatment strategies must be individualized, especially in elderly patients with multiple health issues.